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FFMPEG-FORMATS(1)					     FFMPEG-FORMATS(1)

NAME
       ffmpeg-formats -	FFmpeg formats

DESCRIPTION
       This document describes the supported formats (muxers and demuxers)
       provided	by the libavformat library.

FORMAT OPTIONS
       The libavformat library provides	some generic global options, which can
       be set on all the muxers	and demuxers. In addition each muxer or
       demuxer may support so-called private options, which are	specific for
       that component.

       Options may be set by specifying	-option	value in the FFmpeg tools, or
       by setting the value explicitly in the "AVFormatContext"	options	or
       using the libavutil/opt.h API for programmatic use.

       The list	of supported options follows:

       avioflags flags (input/output)
	   Possible values:

	   direct
	       Reduce buffering.

       probesize integer (input)
	   Set	probing	size in	bytes, i.e. the	size of	the data to analyze to
	   get stream information. A higher value will enable  detecting  more
	   information	in  case  it  is  dispersed  into the stream, but will
	   increase latency. Must be an	integer	not  lesser  than  32.	It  is
	   5000000 by default.

       max_probe_packets integer (input)
	   Set	the  maximum  number of	buffered packets when probing a	codec.
	   Default is 2500 packets.

       packetsize integer (output)
	   Set packet size.

       fflags flags
	   Set format flags. Some are implemented  for	a  limited  number  of
	   formats.

	   Possible values for input files:

	   discardcorrupt
	       Discard corrupted packets.

	   fastseek
	       Enable fast, but	inaccurate seeks for some formats.

	   genpts
	       Generate	missing	PTS if DTS is present.

	   igndts
	       Ignore DTS if PTS is set. Inert when nofillin is	set.

	   ignidx
	       Ignore index.

	   nobuffer
	       Reduce the latency introduced by	buffering during initial input
	       streams analysis.

	   nofillin
	       Do  not	fill  in  missing  values in packet fields that	can be
	       exactly calculated.

	   noparse
	       Disable AVParsers, this needs "+nofillin" too.

	   sortdts
	       Try to interleave output	packets	by DTS.	At present,  available
	       only for	AVIs with an index.

	   Possible values for output files:

	   autobsf
	       Automatically apply bitstream filters as	required by the	output
	       format. Enabled by default.

	   bitexact
	       Only  write  platform-, build- and time-independent data.  This
	       ensures that file and data checksums are	reproducible and match
	       between platforms. Its primary use is for regression testing.

	   flush_packets
	       Write out packets immediately.

	   shortest
	       Stop muxing at the end of  the  shortest	 stream.   It  may  be
	       needed  to  increase max_interleave_delta to avoid flushing the
	       longer streams before EOF.

       seek2any	integer	(input)
	   Allow seeking to non-keyframes on demuxer level when	 supported  if
	   set to 1.  Default is 0.

       analyzeduration integer (input)
	   Specify  how	 many  microseconds are	analyzed to probe the input. A
	   higher value	will enable detecting more accurate  information,  but
	   will	 increase  latency.  It	defaults to 5,000,000 microseconds = 5
	   seconds.

       cryptokey hexadecimal string (input)
	   Set decryption key.

       indexmem	integer	(input)
	   Set max memory used for timestamp index (per	stream).

       rtbufsize integer (input)
	   Set max memory used for buffering real-time frames.

       fdebug flags (input/output)
	   Print specific debug	info.

	   Possible values:

	   ts
       max_delay integer (input/output)
	   Set maximum muxing or demuxing delay	in microseconds.

       fpsprobesize integer (input)
	   Set number of frames	used to	probe fps.

       audio_preload integer (output)
	   Set microseconds by	which  audio  packets  should  be  interleaved
	   earlier.

       chunk_duration integer (output)
	   Set microseconds for	each chunk.

       chunk_size integer (output)
	   Set size in bytes for each chunk.

       err_detect, f_err_detect	flags (input)
	   Set	error detection	flags. "f_err_detect" is deprecated and	should
	   be used only	via the	ffmpeg tool.

	   Possible values:

	   crccheck
	       Verify embedded CRCs.

	   bitstream
	       Detect bitstream	specification deviations.

	   buffer
	       Detect improper bitstream length.

	   explode
	       Abort decoding on minor error detection.

	   careful
	       Consider	things that violate the	spec and have not been seen in
	       the wild	as errors.

	   compliant
	       Consider	all spec non compliancies as errors.

	   aggressive
	       Consider	things that a sane encoder should not do as an error.

       max_interleave_delta integer (output)
	   Set maximum buffering duration for interleaving.  The  duration  is
	   expressed in	microseconds, and defaults to 10000000 (10 seconds).

	   To  ensure  all  the	streams	are interleaved	correctly, libavformat
	   will	wait until it has at least one packet for each	stream	before
	   actually  writing any packets to the	output file. When some streams
	   are	"sparse"  (i.e.	 there	are  large  gaps  between   successive
	   packets), this can result in	excessive buffering.

	   This	 field specifies the maximum difference	between	the timestamps
	   of the first	and the	last packet in the muxing queue,  above	 which
	   libavformat	will  output  a	 packet	 regardless  of	whether	it has
	   queued a packet for all the streams.

	   If set to 0,	libavformat will continue buffering packets  until  it
	   has	a  packet for each stream, regardless of the maximum timestamp
	   difference between the buffered packets.

       use_wallclock_as_timestamps integer (input)
	   Use wallclock as timestamps if set to 1. Default is 0.

       avoid_negative_ts integer (output)
	   Possible values:

	   make_non_negative
	       Shift timestamps	to make	them  non-negative.   Also  note  that
	       this  affects  only  leading  negative timestamps, and not non-
	       monotonic negative timestamps.

	   make_zero
	       Shift timestamps	so that	the first timestamp is 0.

	   auto	(default)
	       Enables shifting	when required by the target format.

	   disabled
	       Disables	shifting of timestamp.

	   When	shifting is enabled, all output	timestamps are shifted by  the
	   same	 amount.  Audio,  video, and subtitles desynching and relative
	   timestamp differences are preserved compared	to how they would have
	   been	without	shifting.

       skip_initial_bytes integer (input)
	   Set number of bytes to skip before reading header and frames	if set
	   to 1.  Default is 0.

       correct_ts_overflow integer (input)
	   Correct single timestamp overflows if set to	1. Default is 1.

       flush_packets integer (output)
	   Flush the underlying	I/O stream after each packet.  Default	is  -1
	   (auto),  which  means  that	the underlying protocol	will decide, 1
	   enables it, and has the effect of reducing the latency, 0  disables
	   it and may increase IO throughput in	some cases.

       output_ts_offset	offset (output)
	   Set the output time offset.

	   offset must be a time duration specification, see the Time duration
	   section in the ffmpeg-utils(1) manual.

	   The offset is added by the muxer to the output timestamps.

	   Specifying  a  positive offset means	that the corresponding streams
	   are delayed bt the time duration specified in offset. Default value
	   is 0	(meaning that no offset	is applied).

       format_whitelist	list (input)
	   "," separated list of allowed demuxers. By default all are allowed.

       dump_separator string (input)
	   Separator used to separate the fields printed on the	 command  line
	   about  the  Stream parameters.  For example,	to separate the	fields
	   with	newlines and indentation:

		   ffprobe -dump_separator "
					     "	-i ~/videos/matrixbench_mpeg2.mpg

       max_streams integer (input)
	   Specifies the maximum number	of streams. This can be	used to	reject
	   files that would require too	many resources due to a	 large	number
	   of streams.

       skip_estimate_duration_from_pts bool (input)
	   Skip	 estimation  of	 input duration	when calculated	using PTS.  At
	   present, applicable for MPEG-PS and MPEG-TS.

       strict, f_strict	integer	(input/output)
	   Specify  how	 strictly  to  follow  the  standards.	"f_strict"  is
	   deprecated and should be used only via the ffmpeg tool.

	   Possible values:

	   very
	       strictly	conform	to an older more strict	version	of the spec or
	       reference software

	   strict
	       strictly	 conform  to all the things in the spec	no matter what
	       consequences

	   normal
	   unofficial
	       allow unofficial	extensions

	   experimental
	       allow  non  standardized	 experimental	things,	  experimental
	       (unfinished/work	 in  progress/not  well	 tested)  decoders and
	       encoders.  Note:	experimental  decoders	can  pose  a  security
	       risk, do	not use	this for decoding untrusted input.

   Format stream specifiers
       Format  stream  specifiers  allow selection of one or more streams that
       match specific properties.

       The  exact  semantics  of  stream  specifiers   is   defined   by   the
       "avformat_match_stream_specifier()"    function	  declared    in   the
       libavformat/avformat.h header and documented in the  Stream  specifiers
       section in the ffmpeg(1)	manual.

DEMUXERS
       Demuxers	are configured elements	in FFmpeg that can read	the multimedia
       streams from a particular type of file.

       When  you  configure  your FFmpeg build,	all the	supported demuxers are
       enabled by default. You can list	all available ones using the configure
       option "--list-demuxers".

       You  can	 disable  all  the  demuxers  using   the   configure	option
       "--disable-demuxers",  and selectively enable a single demuxer with the
       option  "--enable-demuxer=DEMUXER",  or	disable	 it  with  the	option
       "--disable-demuxer=DEMUXER".

       The  option  "-demuxers"	 of  the  ff*  tools  will display the list of
       enabled demuxers. Use "-formats"	to view	a  combined  list  of  enabled
       demuxers	and muxers.

       The description of some of the currently	available demuxers follows.

   aa
       Audible Format 2, 3, and	4 demuxer.

       This demuxer is used to demux Audible Format 2, 3, and 4	(.aa) files.

   aac
       Raw Audio Data Transport	Stream AAC demuxer.

       This  demuxer  is  used	to demux an ADTS input containing a single AAC
       stream alongwith	any ID3v1/2 or APE tags	in it.

   apng
       Animated	Portable Network Graphics demuxer.

       This demuxer is used to demux APNG files.  All  headers,	 but  the  PNG
       signature,  up  to  (but	 not  including)  the  first  fcTL  chunk  are
       transmitted as extradata.  Frames are  then  split  as  being  all  the
       chunks between two fcTL ones, or	between	the last fcTL and IEND chunks.

       -ignore_loop bool
	   Ignore the loop variable in the file	if set.	Default	is enabled.

       -max_fps	int
	   Maximum  framerate  in  frames  per second. Default of 0 imposes no
	   limit.

       -default_fps int
	   Default framerate in	frames per second when none  is	 specified  in
	   the file (0 meaning as fast as possible). Default is	15.

   asf
       Advanced	Systems	Format demuxer.

       This demuxer is used to demux ASF files and MMS network streams.

       -no_resync_search bool
	   Do not try to resynchronize by looking for a	certain	optional start
	   code.

   concat
       Virtual concatenation script demuxer.

       This  demuxer  reads  a	list of	files and other	directives from	a text
       file and	demuxes	them one after the other, as if	all their packets  had
       been muxed together.

       The  timestamps in the files are	adjusted so that the first file	starts
       at 0 and	each next file starts where the	previous  one  finishes.  Note
       that  it	is done	globally and may cause gaps if all streams do not have
       exactly the same	length.

       All files must have the same streams  (same  codecs,  same  time	 base,
       etc.).

       The  duration of	each file is used to adjust the	timestamps of the next
       file: if	the duration is	incorrect (because it was computed  using  the
       bit-rate	 or  because the file is truncated, for	example), it can cause
       artifacts. The  "duration"  directive  can  be  used  to	 override  the
       duration	stored in each file.

       Syntax

       The  script  is	a  text	file in	extended-ASCII,	with one directive per
       line.  Empty lines, leading spaces and  lines  starting	with  '#'  are
       ignored.	The following directive	is recognized:

       "file path"
	   Path	 to  a	file  to  read;	 special characters and	spaces must be
	   escaped with	backslash or single quotes.

	   All subsequent file-related directives apply	to that	file.

       "ffconcat version 1.0"
	   Identify the	script type and	version.

	   To make FFmpeg recognize the	format automatically,  this  directive
	   must	 appear	 exactly  as is	(no extra space	or byte-order-mark) on
	   the very first line of the script.

       "duration dur"
	   Duration of the file. This information can be  specified  from  the
	   file;  specifying  it  here	may  be	 more efficient	or help	if the
	   information from the	file is	not available or accurate.

	   If the duration is set for all files, then it is possible  to  seek
	   in the whole	concatenated video.

       "inpoint	timestamp"
	   In  point of	the file. When the demuxer opens the file it instantly
	   seeks to the	specified timestamp.  Seeking  is  done	 so  that  all
	   streams can be presented successfully at In point.

	   This	directive works	best with intra	frame codecs, because for non-
	   intra  frame	 ones  you  will  usually get extra packets before the
	   actual In point and the decoded content will	 most  likely  contain
	   frames before In point too.

	   For	each  file,  packets  before  the  file	 In  point  will  have
	   timestamps less than	the calculated start  timestamp	 of  the  file
	   (negative in	case of	the first file), and the duration of the files
	   (if	not  specified	by  the	 "duration" directive) will be reduced
	   based on their specified In point.

	   Because of potential	packets	before the specified In	point,	packet
	   timestamps may overlap between two concatenated files.

       "outpoint timestamp"
	   Out	point  of  the	file.  When  the demuxer reaches the specified
	   decoding timestamp in any of	the streams, it	handles	it as  an  end
	   of  file  condition	and  skips  the	 current and all the remaining
	   packets from	all streams.

	   Out point is	exclusive, which  means	 that  the  demuxer  will  not
	   output  packets  with  a decoding timestamp greater or equal	to Out
	   point.

	   This	directive works	best with intra	frame codecs and formats where
	   all streams are tightly interleaved.	For non-intra frame codecs you
	   will	usually	get additional	packets	 with  presentation  timestamp
	   after  Out  point  therefore	 the  decoded content will most	likely
	   contain frames after	Out point too. If your streams are not tightly
	   interleaved you may not get all the packets from all	streams	before
	   Out point and you may only will be  able  to	 decode	 the  earliest
	   stream until	Out point.

	   The	duration  of  the  files  (if  not specified by	the "duration"
	   directive) will be reduced based on their specified Out point.

       "file_packet_metadata key=value"
	   Metadata of the packets of the file.	The specified metadata will be
	   set for each	file packet. You can specify this  directive  multiple
	   times   to  add  multiple  metadata	entries.   This	 directive  is
	   deprecated, use "file_packet_meta" instead.

       "file_packet_meta key value"
	   Metadata of the packets of the file.	The specified metadata will be
	   set for each	file packet. You can specify this  directive  multiple
	   times to add	multiple metadata entries.

       "option key value"
	   Option to access, open and probe the	file.  Can be present multiple
	   times.

       "stream"
	   Introduce  a	 stream	 in  the virtual file.	All subsequent stream-
	   related directives apply  to	 the  last  introduced	stream.	  Some
	   streams  properties	must  be set in	order to allow identifying the
	   matching streams in the subfiles.  If no streams are	defined	in the
	   script, the streams from the	first file are copied.

       "exact_stream_id	id"
	   Set the id of the stream.  If this directive	is given,  the	string
	   with	 the  corresponding  id	in the subfiles	will be	used.  This is
	   especially useful for MPEG-PS (VOB) files, where the	order  of  the
	   streams is not reliable.

       "stream_meta key	value"
	   Metadata for	the stream.  Can be present multiple times.

       "stream_codec value"
	   Codec for the stream.

       "stream_extradata hex_string"
	   Extradata for the string, encoded in	hexadecimal.

       "chapter	id start end"
	   Add	a  chapter.  id	 is  an	 unique	identifier, possibly small and
	   consecutive.

       Options

       This demuxer accepts the	following option:

       safe
	   If set to 1,	reject unsafe file paths and directives.  A file  path
	   is  considered safe if it does not contain a	protocol specification
	   and is relative and all components only contain characters from the
	   portable character set (letters,  digits,  period,  underscore  and
	   hyphen) and have no period at the beginning of a component.

	   If set to 0,	any file name is accepted.

	   The default is 1.

       auto_convert
	   If set to 1,	try to perform automatic conversions on	packet data to
	   make	the streams concatenable.  The default is 1.

	   Currently,  the  only  conversion  is  adding  the h264_mp4toannexb
	   bitstream filter to H.264 streams in	MP4 format. This is  necessary
	   in particular if there are resolution changes.

       segment_time_metadata
	   If  set  to 1, every	packet will contain the	lavf.concat.start_time
	   and the lavf.concat.duration	packet metadata	values which  are  the
	   start_time  and the duration	of the respective file segments	in the
	   concatenated	 output	 expressed  in	microseconds.	The   duration
	   metadata  is	only set if it is known	based on the concat file.  The
	   default is 0.

       Examples

          Use absolute	filenames and include some comments:

		   # my	first filename
		   file	/mnt/share/file-1.wav
		   # my	second filename	including whitespace
		   file	'/mnt/share/file 2.wav'
		   # my	third filename including whitespace plus single	quote
		   file	'/mnt/share/file 3'\''.wav'

          Allow for input format auto-probing,	use safe filenames and set the
	   duration of the first file:

		   ffconcat version 1.0

		   file	file-1.wav
		   duration 20.0

		   file	subdir/file-2.wav

   dash
       Dynamic Adaptive	Streaming over HTTP demuxer.

       This demuxer presents all AVStreams found in the	manifest.  By  setting
       the  discard  flags on AVStreams	the caller can decide which streams to
       actually	 receive.   Each  stream  mirrors  the	"id"  and  "bandwidth"
       properties  from	the "<Representation>" as metadata keys	named "id" and
       "variant_bitrate" respectively.

       Options

       This demuxer accepts the	following option:

       cenc_decryption_key
	   16-byte key,	in hex,	to decrypt files encrypted  using  ISO	Common
	   Encryption (CENC/AES-128 CTR; ISO/IEC 23001-7).

   ea
       Electronic Arts Multimedia format demuxer.

       This format is used by various Electronic Arts games.

       Options

       merge_alpha bool
	   Normally  the  VP6  alpha  channel  (if  exists)  is	 returned as a
	   secondary video stream, by setting this option  you	can  make  the
	   demuxer  return  a  single  video  stream  which contains the alpha
	   channel in addition to the ordinary video.

   imf
       Interoperable Master Format demuxer.

       This  demuxer  presents	audio  and  video  streams  found  in  an  IMF
       Composition,		   as		    specified		    in
       <https://doi.org/10.5594/SMPTE.ST2067-2.2020>.

	       ffmpeg [-assetmaps <path	of ASSETMAP1>,<path of ASSETMAP2>,...] -i <path	of CPL>	...

       If "-assetmaps" is not specified, the demuxer looks for a  file	called
       ASSETMAP.xml in the same	directory as the CPL.

   flv,	live_flv, kux
       Adobe Flash Video Format	demuxer.

       This  demuxer  is  used to demux	FLV files and RTMP network streams. In
       case of live network streams, if	you force format, you may use live_flv
       option instead of flv to	survive	timestamp discontinuities.  KUX	 is  a
       flv variant used	on the Youku platform.

	       ffmpeg -f flv -i	myfile.flv ...
	       ffmpeg -f live_flv -i rtmp://<any.server>/anything/key ....

       -flv_metadata bool
	   Allocate the	streams	according to the onMetaData array content.

       -flv_ignore_prevtag bool
	   Ignore the size of previous tag value.

       -flv_full_metadata bool
	   Output all context of the onMetadata.

   gif
       Animated	GIF demuxer.

       It accepts the following	options:

       min_delay
	   Set	the  minimum  valid  delay  between  frames  in	 hundredths of
	   seconds.  Range is 0	to 6000. Default value is 2.

       max_gif_delay
	   Set the maximum valid delay between frames in hundredth of seconds.
	   Range is  0	to  65535.  Default  value  is	65535  (nearly	eleven
	   minutes), the maximum value allowed by the specification.

       default_delay
	   Set	the  default  delay  between  frames in	hundredths of seconds.
	   Range is 0 to 6000. Default value is	10.

       ignore_loop
	   GIF files can contain information to	loop a certain number of times
	   (or infinitely). If ignore_loop is set to 1,	then the loop  setting
	   from	 the  input will be ignored and	looping	will not occur.	If set
	   to 0, then looping will occur and will cycle	the  number  of	 times
	   according to	the GIF. Default value is 1.

       For  example,  with the overlay filter, place an	infinitely looping GIF
       over another video:

	       ffmpeg -i input.mp4 -ignore_loop	0 -i input.gif -filter_complex overlay=shortest=1 out.mkv

       Note that in the	above example the shortest option for  overlay	filter
       is  used	 to  end  the output video at the length of the	shortest input
       file, which in this case	is input.mp4 as	the GIF	in this	example	 loops
       infinitely.

   hls
       HLS demuxer

       Apple HTTP Live Streaming demuxer.

       This  demuxer  presents all AVStreams from all variant streams.	The id
       field is	set to the  bitrate  variant  index  number.  By  setting  the
       discard	flags  on  AVStreams  (by  pressing 'a'	or 'v' in ffplay), the
       caller can decide which variant streams to actually receive.  The total
       bitrate of the variant that the stream belongs to  is  available	 in  a
       metadata	key named "variant_bitrate".

       It accepts the following	options:

       live_start_index
	   segment  index  to  start live streams at (negative values are from
	   the end).

       prefer_x_start
	   prefer  to  use  #EXT-X-START  if  it's  in	playlist  instead   of
	   live_start_index.

       allowed_extensions
	   ','	separated  list	 of  file  extensions  that  hls is allowed to
	   access.

       max_reload
	   Maximum number of times a insufficient  list	 is  attempted	to  be
	   reloaded.  Default value is 1000.

       m3u8_hold_counters
	   The	maximum	number of times	to load	m3u8 when it refreshes without
	   new segments.  Default value	is 1000.

       http_persistent
	   Use persistent HTTP connections. Applicable only for	HTTP  streams.
	   Enabled by default.

       http_multiple
	   Use	multiple  HTTP	connections  for  downloading  HTTP  segments.
	   Enabled by default for HTTP/1.1 servers.

       http_seekable
	   Use HTTP partial requests  for  downloading	HTTP  segments.	  0  =
	   disable, 1 =	enable,	-1 = auto, Default is auto.

       seg_format_options
	   Set	options	 for  the  demuxer  of	media segments using a list of
	   key=value pairs separated by	":".

       seg_max_retry
	   Maximum number of times to reload a segment on error,  useful  when
	   segment skip	on network error is not	desired.  Default value	is 0.

   image2
       Image file demuxer.

       This  demuxer  reads from a list	of image files specified by a pattern.
       The syntax and meaning of  the  pattern	is  specified  by  the	option
       pattern_type.

       The  pattern  may  contain  a  suffix  which  is	 used to automatically
       determine the format of the images contained in the files.

       The size, the pixel format, and the format of each image	 must  be  the
       same for	all the	files in the sequence.

       This demuxer accepts the	following options:

       framerate
	   Set the frame rate for the video stream. It defaults	to 25.

       loop
	   If set to 1,	loop over the input. Default value is 0.

       pattern_type
	   Select the pattern type used	to interpret the provided filename.

	   pattern_type	accepts	one of the following values.

	   none
	       Disable pattern matching, therefore the video will only contain
	       the  specified  image. You should use this option if you	do not
	       want  to	 create	 sequences  from  multiple  images  and	  your
	       filenames may contain special pattern characters.

	   sequence
	       Select  a  sequence pattern type, used to specify a sequence of
	       files indexed by	sequential numbers.

	       A sequence pattern may contain the string "%d" or "%0Nd", which
	       specifies  the  position	 of  the  characters  representing   a
	       sequential  number  in each filename matched by the pattern. If
	       the form	"%d0Nd"	is used, the string representing the number in
	       each filename is	0-padded and N is the total number of 0-padded
	       digits representing the number. The literal character  '%'  can
	       be specified in the pattern with	the string "%%".

	       If  the	sequence  pattern  contains  "%d" or "%0Nd", the first
	       filename	of the file list specified by the pattern must contain
	       a  number  inclusively  contained  between   start_number   and
	       start_number+start_number_range-1,   and	  all	the  following
	       numbers must be sequential.

	       For example the pattern "img-%03d.bmp" will match a sequence of
	       filenames  of   the   form   img-001.bmp,   img-002.bmp,	  ...,
	       img-010.bmp,  etc.;  the	 pattern "i%%m%%g-%d.jpg" will match a
	       sequence	of filenames of	 the  form  i%m%g-1.jpg,  i%m%g-2.jpg,
	       ..., i%m%g-10.jpg, etc.

	       Note  that  the	pattern	 must  not necessarily contain "%d" or
	       "%0Nd", for example to convert a	single image file img.jpeg you
	       can employ the command:

		       ffmpeg -i img.jpeg img.png

	   glob
	       Select a	glob wildcard pattern type.

	       The pattern is interpreted like a  "glob()"  pattern.  This  is
	       only  selectable	 if  libavformat  was  compiled	 with globbing
	       support.

	   glob_sequence (deprecated, will be removed)
	       Select a	mixed glob wildcard/sequence pattern.

	       If your version	of  libavformat	 was  compiled	with  globbing
	       support,	 and  the  provided pattern contains at	least one glob
	       meta character among "%*?[]{}" that is preceded by an unescaped
	       "%", the	 pattern  is  interpreted  like	 a  "glob()"  pattern,
	       otherwise it is interpreted like	a sequence pattern.

	       All  glob  special  characters  "%*?[]{}" must be prefixed with
	       "%". To escape a	literal	"%" you	shall use "%%".

	       For example  the	 pattern  "foo-%*.jpeg"	 will  match  all  the
	       filenames  prefixed by "foo-" and terminating with ".jpeg", and
	       "foo-%?%?%?.jpeg" will match all	the  filenames	prefixed  with
	       "foo-",	followed  by  a	 sequence  of  three  characters,  and
	       terminating with	".jpeg".

	       This pattern type is deprecated in favor	of glob	and sequence.

	   Default value is glob_sequence.

       pixel_format
	   Set the pixel format	of the images to read. If  not	specified  the
	   pixel format	is guessed from	the first image	file in	the sequence.

       start_number
	   Set	the  index  of	the  file matched by the image file pattern to
	   start to read from. Default value is	0.

       start_number_range
	   Set the index interval range	to check when looking  for  the	 first
	   image  file	in  the	 sequence, starting from start_number. Default
	   value is 5.

       ts_from_file
	   If set to 1,	will set frame timestamp to modification time of image
	   file. Note that monotonity of timestamps is not provided: images go
	   in the same order as	without	this option. Default value is  0.   If
	   set	to 2, will set frame timestamp to the modification time	of the
	   image file in nanosecond precision.

       video_size
	   Set the video size of the images to	read.  If  not	specified  the
	   video size is guessed from the first	image file in the sequence.

       export_path_metadata
	   If  set  to	1,  will add two extra fields to the metadata found in
	   input, making them also available for other filters	(see  drawtext
	   filter  for	examples).  Default  value  is 0. The extra fields are
	   described below:

	   lavf.image2dec.source_path
	       Corresponds to the full path to the input file being read.

	   lavf.image2dec.source_basename
	       Corresponds to the name of the file being read.

       Examples

          Use ffmpeg for creating  a  video  from  the	 images	 in  the  file
	   sequence  img-001.jpeg,  img-002.jpeg, ..., assuming	an input frame
	   rate	of 10 frames per second:

		   ffmpeg -framerate 10	-i 'img-%03d.jpeg' out.mkv

          As above, but start by reading from a file with index  100  in  the
	   sequence:

		   ffmpeg -framerate 10	-start_number 100 -i 'img-%03d.jpeg' out.mkv

          Read	 images	 matching  the	"*.png"	glob pattern , that is all the
	   files terminating with the ".png" suffix:

		   ffmpeg -framerate 10	-pattern_type glob -i "*.png" out.mkv

   libgme
       The Game	Music Emu library is a collection of  video  game  music  file
       emulators.

       See   <https://bitbucket.org/mpyne/game-music-emu/overview>   for  more
       information.

       It accepts the following	options:

       track_index
	   Set the index of which track	to demux. The demuxer can only	export
	   one	track.	Track indexes start at 0. Default is to	pick the first
	   track. Number of tracks is exported as tracks metadata entry.

       sample_rate
	   Set the sampling rate of the	 exported  track.  Range  is  1000  to
	   999999. Default is 44100.

       max_size	(bytes)
	   The	demuxer	buffers	the entire file	into memory. Adjust this value
	   to set the maximum buffer size, which in turn, acts	as  a  ceiling
	   for the size	of files that can be read.  Default is 50 MiB.

   libmodplug
       ModPlug based module demuxer

       See <https://github.com/Konstanty/libmodplug>

       It will export one 2-channel 16-bit 44.1	kHz audio stream.  Optionally,
       a  "pal8" 16-color video	stream can be exported with or without printed
       metadata.

       It accepts the following	options:

       noise_reduction
	   Apply a simple low-pass filter. Can be 1 (on) or 0  (off).  Default
	   is 0.

       reverb_depth
	   Set amount of reverb. Range 0-100. Default is 0.

       reverb_delay
	   Set delay in	ms, clamped to 40-250 ms. Default is 0.

       bass_amount
	   Apply  bass	expansion a.k.a. XBass or megabass. Range is 0 (quiet)
	   to 100 (loud). Default is 0.

       bass_range
	   Set cutoff i.e. upper-bound for bass	frequencies. Range  is	10-100
	   Hz. Default is 0.

       surround_depth
	   Apply  a Dolby Pro-Logic surround effect. Range is 0	(quiet)	to 100
	   (heavy). Default is 0.

       surround_delay
	   Set surround	delay in ms, clamped to	5-40 ms. Default is 0.

       max_size
	   The demuxer buffers the entire file into memory. Adjust this	 value
	   to  set  the	 maximum buffer	size, which in turn, acts as a ceiling
	   for the size	of files that can be read. Range is 0 to 100  MiB.   0
	   removes buffer size limit (not recommended).	Default	is 5 MiB.

       video_stream_expr
	   String  which  is  evaluated	using the eval API to assign colors to
	   the generated video stream.	Variables which	can be used  are  "x",
	   "y",	"w", "h", "t", "speed",	"tempo", "order", "pattern" and	"row".

       video_stream
	   Generate video stream. Can be 1 (on)	or 0 (off). Default is 0.

       video_stream_w
	   Set video frame width in 'chars' where one char indicates 8 pixels.
	   Range is 20-512. Default is 30.

       video_stream_h
	   Set	video  frame  height  in  'chars'  where  one char indicates 8
	   pixels. Range is 20-512. Default is 30.

       video_stream_ptxt
	   Print metadata on video stream. Includes "speed", "tempo", "order",
	   "pattern", "row" and	"ts" (time in ms). Can be 1 (on) or  0	(off).
	   Default is 1.

   libopenmpt
       libopenmpt based	module demuxer

       See <https://lib.openmpt.org/libopenmpt/> for more information.

       Some  files  have  multiple  subsongs (tracks) this can be set with the
       subsong option.

       It accepts the following	options:

       subsong
	   Set the subsong index. This can be either  'all',  'auto',  or  the
	   index  of  the  subsong. Subsong indexes start at 0.	The default is
	   'auto'.

	   The default value is	to let libopenmpt choose.

       layout
	   Set the channel layout. Valid  values  are  1,  2,  and  4  channel
	   layouts.  The default value is STEREO.

       sample_rate
	   Set	the  sample rate for libopenmpt	to output.  Range is from 1000
	   to INT_MAX. The value default is 48000.

   mov/mp4/3gp
       Demuxer for Quicktime File Format &  ISO/IEC  Base  Media  File	Format
       (ISO/IEC	14496-12 or MPEG-4 Part	12, ISO/IEC 15444-12 or	JPEG 2000 Part
       12).

       Registered  extensions:	mov,  mp4,  m4a, 3gp, 3g2, mj2,	psp, m4b, ism,
       ismv, isma, f4v

       Options

       This demuxer accepts the	following options:

       enable_drefs
	   Enable loading of external tracks, disabled by  default.   Enabling
	   this	can theoretically leak information in some use cases.

       use_absolute_path
	   Allows  loading  of external	tracks via absolute paths, disabled by
	   default.  Enabling this poses a security risk. It  should  only  be
	   enabled if the source is known to be	non-malicious.

       seek_streams_individually
	   When	  seeking,   identify	the   closest  point  in  each	stream
	   individually	and demux  packets  in	that  stream  from  identified
	   point. This can lead	to a different sequence	of packets compared to
	   demuxing linearly from the beginning. Default is true.

       ignore_editlist
	   Ignore  any	edit list atoms. The demuxer, by default, modifies the
	   stream index	to reflect the timeline	described by  the  edit	 list.
	   Default is false.

       advanced_editlist
	   Modify  the	stream	index to reflect the timeline described	by the
	   edit	list. "ignore_editlist"	must be	set to false for  this	option
	   to be effective.  If	both "ignore_editlist" and this	option are set
	   to  false,  then  only the start of the stream index	is modified to
	   reflect initial dwell time or starting timestamp described  by  the
	   edit	list. Default is true.

       ignore_chapters
	   Don't  parse	 chapters. This	includes GoPro 'HiLight' tags/moments.
	   Note	that chapters are only parsed when input is seekable.  Default
	   is false.

       use_mfra_for
	   For	seekable  fragmented  input, set fragment's starting timestamp
	   from	media fragment random access box, if present.

	   Following options are available:

	   auto
	       Auto-detect whether to  set  mfra  timestamps  as  PTS  or  DTS
	       (default)

	   dts Set mfra	timestamps as DTS

	   pts Set mfra	timestamps as PTS

	   0   Don't use mfra box to set timestamps

       use_tfdt
	   For	 fragmented   input,  set  fragment's  starting	 timestamp  to
	   "baseMediaDecodeTime" from the "tfdt"  box.	 Default  is  enabled,
	   which  will prefer to use the "tfdt"	box to set DTS.	Disable	to use
	   the "earliest_presentation_time" from the "sidx"  box.   In	either
	   case,  the  timestamp  from	the  "mfra"  box  will be used if it's
	   available and "use_mfra_for"	is set to pts or dts.

       export_all
	   Export unrecognized boxes within the	udta box as metadata  entries.
	   The	first  four  characters	 of  the  box type are set as the key.
	   Default is false.

       export_xmp
	   Export entire contents of XMP_ box and uuid box as  a  string  with
	   key	"xmp". Note that if "export_all" is set	and this option	isn't,
	   the contents	of XMP_	box are	still exported but  with  key  "XMP_".
	   Default is false.

       activation_bytes
	   4-byte  key	required  to  decrypt  Audible AAX and AAX+ files. See
	   Audible AAX subsection below.

       audible_fixed_key
	   Fixed key used for handling Audible AAX/AAX+	 files.	 It  has  been
	   pre-set so should not be necessary to specify.

       decryption_key
	   16-byte  key,  in  hex, to decrypt files encrypted using ISO	Common
	   Encryption (CENC/AES-128 CTR; ISO/IEC 23001-7).

       max_stts_delta
	   Very	 high  sample  deltas  written	in  a  trak's  stts  box   may
	   occasionally	 be  intended but usually they are written in error or
	   used	to store a negative value for dts correction when  treated  as
	   signed  32-bit  integers.  This  option  lets the user set an upper
	   limit, beyond which the delta is clamped to 1. Values greater  than
	   the	limit if negative when cast to int32 are used to adjust	onward
	   dts.

	   Unit	is the track time scale. Range is 0 to	UINT_MAX.  Default  is
	   "UINT_MAX  -	48000*10" which	allows upto a 10 second	dts correction
	   for 48 kHz audio streams  while  accommodating  99.9%  of  "uint32"
	   range.

       interleaved_read
	   Interleave packets from multiple tracks at demuxer level. For badly
	   interleaved	files,	this  prevents playback	issues caused by large
	   gaps	between	packets	in different tracks, as	MOV/MP4	 do  not  have
	   packet  placement  requirements.  However, this can cause excessive
	   seeking on very badly interleaved files,  due  to  seeking  between
	   tracks,  so	disabling it may prevent I/O issues, at	the expense of
	   playback.

       Audible AAX

       Audible AAX files are encrypted M4B files, and they can be decrypted by
       specifying a 4 byte activation secret.

	       ffmpeg -activation_bytes	1CEB00DA -i test.aax -vn -c:a copy output.mp4

   mpegts
       MPEG-2 transport	stream demuxer.

       This demuxer accepts the	following options:

       resync_size
	   Set size limit for looking up a new synchronization.	Default	 value
	   is 65536.

       skip_unknown_pmt
	   Skip	PMTs for programs not defined in the PAT. Default value	is 0.

       fix_teletext_pts
	   Override  teletext  packet  PTS  and	DTS values with	the timestamps
	   calculated from the PCR of the first	 program  which	 the  teletext
	   stream  is  part  of	 and is	not discarded. Default value is	1, set
	   this	option to 0 if you want	 your  teletext	 packet	 PTS  and  DTS
	   values untouched.

       ts_packetsize
	   Output  option  carrying  the  raw  packet size in bytes.  Show the
	   detected raw	packet size, cannot be set by the user.

       scan_all_pmts
	   Scan	and combine all	PMTs. The value	is an integer with value  from
	   -1  to  1  (-1  means  automatic  setting, 1	means enabled, 0 means
	   disabled). Default value is -1.

       merge_pmt_versions
	   Re-use existing  streams  when  a  PMT's  version  is  updated  and
	   elementary streams move to different	PIDs. Default value is 0.

       max_packet_size
	   Set	maximum	 size,	in  bytes,  of	packet emitted by the demuxer.
	   Payloads above this size are	split across multiple  packets.	 Range
	   is 1	to INT_MAX/2. Default is 204800	bytes.

   mpjpeg
       MJPEG encapsulated in multi-part	MIME demuxer.

       This  demuxer  allows reading of	MJPEG, where each frame	is represented
       as a part of multipart/x-mixed-replace stream.

       strict_mime_boundary
	   Default implementation applies a  relaxed  standard	to  multi-part
	   MIME	 boundary  detection,  to  prevent  regression	with  numerous
	   existing endpoints not  generating  a  proper  MIME	MJPEG  stream.
	   Turning this	option on by setting it	to 1 will result in a stricter
	   check of the	boundary value.

   rawvideo
       Raw video demuxer.

       This  demuxer  allows  one  to  read  raw video data. Since there is no
       header specifying the assumed video parameters, the user	 must  specify
       them in order to	be able	to decode the data correctly.

       This demuxer accepts the	following options:

       framerate
	   Set input video frame rate. Default value is	25.

       pixel_format
	   Set the input video pixel format. Default value is "yuv420p".

       video_size
	   Set the input video size. This value	must be	specified explicitly.

       For  example  to	read a rawvideo	file input.raw with ffplay, assuming a
       pixel format of "rgb24",	a video	size of	"320x240", and a frame rate of
       10 images per second, use the command:

	       ffplay -f rawvideo -pixel_format	rgb24 -video_size 320x240 -framerate 10	input.raw

   sbg
       SBaGen script demuxer.

       This   demuxer	reads	the   script   language	  used	  by	SBaGen
       <http://uazu.net/sbagen/>  to  generate	binaural beats sessions. A SBG
       script looks like that:

	       -SE
	       a: 300-2.5/3 440+4.5/0
	       b: 300-2.5/0 440+4.5/3
	       off: -
	       NOW	== a
	       +0:07:00	== b
	       +0:14:00	== a
	       +0:21:00	== b
	       +0:30:00	   off

       A SBG script can	mix absolute and relative timestamps.  If  the	script
       uses  either only absolute timestamps (including	the script start time)
       or only relative	ones, then its layout is fixed,	and the	conversion  is
       straightforward.	 On  the  other	hand, if the script mixes both kind of
       timestamps, then	the NOW	reference  for	relative  timestamps  will  be
       taken  from the current time of day at the time the script is read, and
       the script layout will be frozen	 according  to	that  reference.  That
       means  that  if	the  script  is	directly played, the actual times will
       match the absolute  timestamps  up  to  the  sound  controller's	 clock
       accuracy,  but  if  the	user somehow pauses the	playback or seeks, all
       times will be shifted accordingly.

   tedcaptions
       JSON captions used for <http://www.ted.com/>.

       TED does	not provide links to the captions, but	they  can  be  guessed
       from  the page. The file	tools/bookmarklets.html	from the FFmpeg	source
       tree contains a bookmarklet to expose them.

       This demuxer accepts the	following option:

       start_time
	   Set the start time of the TED talk, in milliseconds.	The default is
	   15000 (15s).	It is used to sync the captions	with the  downloadable
	   videos, because they	include	a 15s intro.

       Example:	convert	the captions to	a format most players understand:

	       ffmpeg -i http://www.ted.com/talks/subtitles/id/1/lang/en talk1-en.srt

   vapoursynth
       Vapoursynth wrapper.

       Due  to security	concerns, Vapoursynth scripts will not be autodetected
       so the input format has to be  forced.  For  ff*	 CLI  tools,  add  "-f
       vapoursynth" before the input "-i yourscript.vpy".

       This demuxer accepts the	following option:

       max_script_size
	   The	demuxer	 buffers  the  entire  script into memory. Adjust this
	   value to set	the maximum buffer size, which	in  turn,  acts	 as  a
	   ceiling  for	 the  size  of scripts that can	be read.  Default is 1
	   MiB.

MUXERS
       Muxers are configured elements in FFmpeg	which allow writing multimedia
       streams to a particular type of file.

       When you	configure your FFmpeg build,  all  the	supported  muxers  are
       enabled	by  default.  You  can	list  all  available  muxers using the
       configure option	"--list-muxers".

       You  can	 disable  all	the   muxers   with   the   configure	option
       "--disable-muxers"  and selectively enable / disable single muxers with
       the options "--enable-muxer=MUXER" / "--disable-muxer=MUXER".

       The option "-muxers" of the ff* tools will display the list of  enabled
       muxers.	Use "-formats" to view a combined list of enabled demuxers and
       muxers.

       A description of	some of	the currently available	muxers follows.

   a64
       A64 muxer for Commodore 64  video.  Accepts  a  single  "a64_multi"  or
       "a64_multi5" codec video	stream.

   adts
       Audio Data Transport Stream muxer. It accepts a single AAC stream.

       Options

       It accepts the following	options:

       write_id3v2 bool
	   Enable to write ID3v2.4 tags	at the start of	the stream. Default is
	   disabled.

       write_apetag bool
	   Enable  to  write  APE  tags	 at  the end of	the stream. Default is
	   disabled.

       write_mpeg2 bool
	   Enable to set MPEG version bit in the ADTS frame header to 1	 which
	   indicates MPEG-2. Default is	0, which indicates MPEG-4.

   aiff
       Audio Interchange File Format muxer.

       Options

       It accepts the following	options:

       write_id3v2
	   Enable ID3v2	tags writing when set to 1. Default is 0 (disabled).

       id3v2_version
	   Select ID3v2	version	to write. Currently only version 3 and 4 (aka.
	   ID3v2.3 and ID3v2.4)	are supported. The default is version 4.

   alp
       Muxer for audio of High Voltage Software's Lego Racers game. It accepts
       a single	ADPCM_IMA_ALP stream with no more than 2 channels nor a	sample
       rate greater than 44100 Hz.

       Extensions: tun,	pcm

       Options

       It accepts the following	options:

       type type
	   Set file type.

	   tun Set file	type as	music. Must have a sample rate of 22050	Hz.

	   pcm Set file	type as	sfx.

	   auto
	       Set  file  type as per output file extension. ".pcm" results in
	       type "pcm" else type "tun" is set. (default)

   asf
       Advanced	Systems	Format muxer.

       Note that Windows Media Audio (wma) and Windows Media Video  (wmv)  use
       this muxer too.

       Options

       It accepts the following	options:

       packet_size
	   Set	the  muxer  packet size. By tuning this	setting	you may	reduce
	   data	fragmentation or muxer	overhead  depending  on	 your  source.
	   Default value is 3200, minimum is 100, maximum is 64k.

   avi
       Audio Video Interleaved muxer.

       Options

       It accepts the following	options:

       reserve_index_space
	   Reserve  the	specified amount of bytes for the OpenDML master index
	   of each stream within the file header. By default additional	master
	   indexes are embedded	within the data	packets	if there is  no	 space
	   left	 in  the first master index and	are linked together as a chain
	   of indexes. This index structure can	cause problems	for  some  use
	   cases,  e.g.	 third-party  software strictly	relying	on the OpenDML
	   index specification or when file seeking is slow. Reserving	enough
	   index space in the file header avoids these problems.

	   The required	index space depends on the output file size and	should
	   be  about 16	bytes per gigabyte. When this option is	omitted	or set
	   to zero the necessary index space is	guessed.

       write_channel_mask
	   Write the channel layout mask into the audio	stream header.

	   This	option is enabled by default. Disabling	the channel  mask  can
	   be  useful  in specific scenarios, e.g. when	merging	multiple audio
	   streams into	one for	compatibility with software that only supports
	   a single audio stream in AVI	 (see  the  "amerge"  section  in  the
	   ffmpeg-filters manual).

       flipped_raw_rgb
	   If  set  to	true, store positive height for	raw RGB	bitmaps, which
	   indicates bitmap is stored bottom-up. Note that  this  option  does
	   not	flip the bitmap	which has to be	done manually beforehand, e.g.
	   by using the	vflip filter.  Default is false	and  indicates	bitmap
	   is stored top down.

   chromaprint
       Chromaprint fingerprinter.

       This muxer feeds	audio data to the Chromaprint library, which generates
       a     fingerprint     for     the     provided	 audio	  data.	   See
       <https://acoustid.org/chromaprint>

       It takes	a single signed	native-endian 16-bit raw audio	stream	of  at
       most 2 channels.

       Options

       silence_threshold
	   Threshold  for  detecting silence. Range is from -1 to 32767, where
	   -1 disables silence detection. Silence detection can	only  be  used
	   with	 version  3  of	 the  algorithm.   Silence  detection  must be
	   disabled for	use with the AcoustID service. Default is -1.

       algorithm
	   Version of algorithm	to fingerprint with. Range is 0	to 4.  Version
	   3 enables silence detection.	Default	is 1.

       fp_format
	   Format to output the	fingerprint as.	Accepts	the following options:

	   raw Binary raw fingerprint

	   compressed
	       Binary compressed fingerprint

	   base64
	       Base64 compressed fingerprint (default)

   crc
       CRC (Cyclic Redundancy Check) testing format.

       This muxer computes and prints the Adler-32 CRC of all the input	 audio
       and  video  frames.  By	default	 audio	frames are converted to	signed
       16-bit raw audio	and video frames to raw	 video	before	computing  the
       CRC.

       The  output  of	the  muxer  consists  of  a  single  line of the form:
       CRC=0xCRC, where	CRC is a  hexadecimal  number  0-padded	 to  8	digits
       containing the CRC for all the decoded input frames.

       See also	the framecrc muxer.

       Examples

       For  example  to	compute	the CRC	of the input, and store	it in the file
       out.crc:

	       ffmpeg -i INPUT -f crc out.crc

       You can print the CRC to	stdout with the	command:

	       ffmpeg -i INPUT -f crc -

       You can	select	the  output  format  of	 each  frame  with  ffmpeg  by
       specifying the audio and	video codec and	format.	For example to compute
       the  CRC	 of  the  input	 audio converted to PCM	unsigned 8-bit and the
       input video converted to	MPEG-2 video, use the command:

	       ffmpeg -i INPUT -c:a pcm_u8 -c:v	mpeg2video -f crc -

   dash
       Dynamic Adaptive	Streaming over HTTP (DASH) muxer that creates segments
       and  manifest  files  according	to  the	 MPEG-DASH  standard   ISO/IEC
       23009-1:2014.

       For more	information see:

          ISO			     DASH			Specification:
	   <http://standards.iso.org/ittf/PubliclyAvailableStandards/c065274_ISO_IEC_23009-1_2014.zip>

          WebM			     DASH			Specification:
	   <https://sites.google.com/a/webmproject.org/wiki/adaptive-streaming/webm-dash-specification>

       It creates a MPD	manifest file and segment files	for each stream.

       The  segment  filename  might contain pre-defined identifiers used with
       SegmentTemplate as  defined  in	section	 5.3.9.4.4  of	the  standard.
       Available    identifiers	   are	  "$RepresentationID$",	   "$Number$",
       "$Bandwidth$" and "$Time$".  In addition	to the	standard  identifiers,
       an   ffmpeg-specific   "$ext$"  identifier  is  also  supported.	  When
       specified ffmpeg	will replace  $ext$  in	 the  file  name  with	muxing
       format's	extensions such	as mp4,	webm etc.,

	       ffmpeg -re -i <input> -map 0 -map 0 -c:a	libfdk_aac -c:v	libx264	\
	       -b:v:0 800k -b:v:1 300k -s:v:1 320x170 -profile:v:1 baseline \
	       -profile:v:0 main -bf 1 -keyint_min 120 -g 120 -sc_threshold 0 \
	       -b_strategy 0 -ar:a:1 22050 -use_timeline 1 -use_template 1 \
	       -window_size 5 -adaptation_sets "id=0,streams=v id=1,streams=a" \
	       -f dash /path/to/out.mpd

       seg_duration duration
	   Set	the  segment  length in	seconds	(fractional value can be set).
	   The value is	treated	as average segment duration when  use_template
	   is  enabled	and  use_timeline  is  disabled	and as minimum segment
	   duration for	all the	other use cases.

       frag_duration duration
	   Set the length in seconds of	fragments within segments  (fractional
	   value can be	set).

       frag_type type
	   Set the type	of interval for	fragmentation.

       window_size size
	   Set the maximum number of segments kept in the manifest.

       extra_window_size size
	   Set	the  maximum  number  of segments kept outside of the manifest
	   before removing from	disk.

       remove_at_exit remove
	   Enable (1) or disable (0) removal of	all segments when finished.

       use_template template
	   Enable (1)  or  disable  (0)	 use  of  SegmentTemplate  instead  of
	   SegmentList.

       use_timeline timeline
	   Enable   (1)	  or   disable	 (0)   use   of	  SegmentTimeline   in
	   SegmentTemplate.

       single_file single_file
	   Enable (1) or  disable  (0)	storing	 all  segments	in  one	 file,
	   accessed using byte ranges.

       single_file_name	file_name
	   DASH-templated name to be used for baseURL. Implies single_file set
	   to  "1".  In	 the  template,	"$ext$"	is replaced with the file name
	   extension specific for the segment format.

       init_seg_name init_name
	   DASH-templated name to used for the initialization segment. Default
	   is "init-stream$RepresentationID$.$ext$". "$ext$" is	replaced  with
	   the file name extension specific for	the segment format.

       media_seg_name segment_name
	   DASH-templated  name	 to  used  for	the media segments. Default is
	   "chunk-stream$RepresentationID$-$Number%05d$.$ext$".	  "$ext$"   is
	   replaced  with  the	file  name  extension specific for the segment
	   format.

       utc_timing_url utc_url
	   URL of the page that	will return the	UTC timestamp in  ISO  format.
	   Example: "https://time.akamai.com/?iso"

       method method
	   Use	the given HTTP method to create	output files. Generally	set to
	   PUT or POST.

       http_user_agent user_agent
	   Override User-Agent field in	HTTP header. Applicable	only for  HTTP
	   output.

       http_persistent http_persistent
	   Use persistent HTTP connections. Applicable only for	HTTP output.

       hls_playlist hls_playlist
	   Generate  HLS  playlist  files  as  well.  The  master  playlist is
	   generated with the filename hls_master_name.	  One  media  playlist
	   file	 is  generated	for  each  stream with filenames media_0.m3u8,
	   media_1.m3u8, etc.

       hls_master_name file_name
	   HLS master playlist name. Default is	"master.m3u8".

       streaming streaming
	   Enable (1) or disable (0) chunk streaming mode of output. In	 chunk
	   streaming  mode,  each  frame will be a moof	fragment which forms a
	   chunk.

       adaptation_sets adaptation_sets
	   Assign streams to  AdaptationSets.  Syntax  is  "id=x,streams=a,b,c
	   id=y,streams=d,e" with x and	y being	the IDs	of the adaptation sets
	   and a,b,c,d and e are the indices of	the mapped streams.

	   To  map  all	 video (or audio) streams to an	AdaptationSet, "v" (or
	   "a")	can be used as stream identifier instead of IDs.

	   When	no assignment is defined, this defaults	 to  an	 AdaptationSet
	   for each stream.

	   Optional			     syntax			    is
	   "id=x,seg_duration=x,frag_duration=x,frag_type=type,descriptor=descriptor_string,streams=a,b,c
	   id=y,seg_duration=y,frag_type=type,streams=d,e"    and    so	   on,
	   descriptor	is   useful   to   the	 scheme	  defined  by  ISO/IEC
	   23009-1:2014/Amd.2:2015.	 For	 example,     -adaptation_sets
	   "id=0,descriptor=<SupplementalProperty
	   schemeIdUri=\"urn:mpeg:dash:srd:2014\"
	   value=\"0,0,0,1,1,2,2\"/>,streams=v".   Please note that descriptor
	   string  should  be	a   self-closing   xml	 tag.	 seg_duration,
	   frag_duration  and  frag_type override the global option values for
	   each	   adaptation	 set.	  For	 example,     -adaptation_sets
	   "id=0,seg_duration=2,frag_duration=1,frag_type=duration,streams=v
	   id=1,seg_duration=2,frag_type=none,streams=a"   type_id   marks  an
	   adaptation set as containing	streams	meant to  be  used  for	 Trick
	   Mode	  for	the   referenced   adaptation	set.	For   example,
	   -adaptation_sets	 "id=0,seg_duration=2,frag_type=none,streams=0
	   id=1,seg_duration=10,frag_type=none,trick_id=0,streams=1"

       timeout timeout
	   Set	timeout	 for  socket  I/O operations. Applicable only for HTTP
	   output.

       index_correction	index_correction
	   Enable  (1)	or  Disable  (0)  segment  index   correction	logic.
	   Applicable  only  when  use_template	is enabled and use_timeline is
	   disabled.

	   When	enabled, the logic monitors the	flow of	segment	indexes. If  a
	   streams's  segment  index  value  is	 not at	the expected real time
	   position, then the logic corrects that index	value.

	   Typically this logic	is needed in live  streaming  use  cases.  The
	   network   bandwidth	 fluctuations	are  common  during  long  run
	   streaming. Each fluctuation can  cause  the	segment	 indexes  fall
	   behind the expected real time position.

       format_options options_list
	   Set	container format (mp4/webm) options using a ":"	separated list
	   of key=value	parameters. Values containing ":"  special  characters
	   must	be escaped.

       global_sidx global_sidx
	   Write  global  SIDX	atom.  Applicable  only	 for  single file, mp4
	   output, non-streaming mode.

       dash_segment_type dash_segment_type
	   Possible values:

	   auto
	       If this flag is set, the	dash  segment  files  format  will  be
	       selected	based on the stream codec. This	is the default mode.

	   mp4 If  this	 flag  is  set,	 the  dash segment files will be in in
	       ISOBMFF format.

	   webm
	       If this flag is set, the	dash segment files will	be in in  WebM
	       format.

       ignore_io_errors	ignore_io_errors
	   Ignore  IO  errors  during open and write. Useful for long-duration
	   runs	with network output.

       lhls lhls
	   Enable Low-latency HLS(LHLS). Adds #EXT-X-PREFETCH tag with current
	   segment's URI.  hls.js player folks are trying  to  standardize  an
	   open	   LHLS	   spec.    The	   draft    spec   is	available   in
	   https://github.com/video-dev/hlsjs-rfcs/blob/lhls-spec/proposals/0001-lhls.md
	   This	option tries to	comply with the	above open spec.   It  enables
	   streaming  and  hls_playlist	 options  automatically.   This	 is an
	   experimental	feature.

	   Note:    This    is	  not	 Apple's     version	 LHLS.	   See
	   <https://datatracker.ietf.org/doc/html/draft-pantos-hls-rfc8216bis>

       ldash ldash
	   Enable  Low-latency Dash by constraining the	presence and values of
	   some	elements.

       master_m3u8_publish_rate	master_m3u8_publish_rate
	   Publish master playlist repeatedly every after specified number  of
	   segment intervals.

       write_prft write_prft
	   Write  Producer  Reference Time elements on supported streams. This
	   also	enables	writing	prft boxes in the underlying muxer. Applicable
	   only	when the utc_url option	is  enabled.   It's  set  to  auto  by
	   default,  in	which case the muxer will attempt to enable it only in
	   modes that require it.

       mpd_profile mpd_profile
	   Set one or more manifest profiles.

       http_opts http_opts
	   A :-separated list of key=value options to pass to  the  underlying
	   HTTP	protocol. Applicable only for HTTP output.

       target_latency target_latency
	   Set	an intended target latency in seconds (fractional value	can be
	   set)	for serving. Applicable	only  when  streaming  and  write_prft
	   options are enabled.	 This is an informative	fields clients can use
	   to measure the latency of the service.

       min_playback_rate min_playback_rate
	   Set	the  minimum  playback	rate  indicated	as appropriate for the
	   purposes of automatically adjusting	playback  latency  and	buffer
	   occupancy during normal playback by clients.

       max_playback_rate max_playback_rate
	   Set	the  maximum  playback	rate  indicated	as appropriate for the
	   purposes of automatically adjusting	playback  latency  and	buffer
	   occupancy during normal playback by clients.

       update_period update_period
	    Set	the mpd	update period ,for dynamic content.
	    The	unit is	second.

   fifo
       The  fifo  pseudo-muxer allows the separation of	encoding and muxing by
       using first-in-first-out	queue  and  running  the  actual  muxer	 in  a
       separate	 thread. This is especially useful in combination with the tee
       muxer and can be	 used  to  send	 data  to  several  destinations  with
       different reliability/writing speed/latency.

       API  users should be aware that callback	functions (interrupt_callback,
       io_open and io_close) used within its AVFormatContext must  be  thread-
       safe.

       The  behavior  of the fifo muxer	if the queue fills up or if the	output
       fails is	selectable,

          output can  be  transparently  restarted  with  configurable	 delay
	   between retries based on real time or time of the processed stream.

          encoding  can  be  blocked  during  temporary  failure, or continue
	   transparently dropping packets in case fifo queue fills up.

       fifo_format
	   Specify the format name. Useful if it cannot	be  guessed  from  the
	   output name suffix.

       queue_size
	   Specify size	of the queue (number of	packets). Default value	is 60.

       format_opts
	   Specify  format options for the underlying muxer. Muxer options can
	   be specified	as a list of key=value pairs separated by ':'.

       drop_pkts_on_overflow bool
	   If set to 1 (true), in case the fifo	queue fills up,	 packets  will
	   be dropped rather than blocking the encoder.	This makes it possible
	   to  continue	 streaming  without delaying the input,	at the cost of
	   omitting part of the	stream.	By default this	option	is  set	 to  0
	   (false),  so	 in  such  cases the encoder will be blocked until the
	   muxer processes some	of the packets and none	of them	is lost.

       attempt_recovery	bool
	   If  failure	occurs,	 attempt  to  recover  the  output.  This   is
	   especially  useful when used	with network output, since it makes it
	   possible to	restart	 streaming  transparently.   By	 default  this
	   option is set to 0 (false).

       max_recovery_attempts
	   Sets	 maximum  number  of successive	unsuccessful recovery attempts
	   after which the output fails	permanently. By	default	this option is
	   set to 0 (unlimited).

       recovery_wait_time duration
	   Waiting time	 before	 the  next  recovery  attempt  after  previous
	   unsuccessful	recovery attempt. Default value	is 5 seconds.

       recovery_wait_streamtime	bool
	   If  set  to	0  (false), the	real time is used when waiting for the
	   recovery attempt (i.e. the recovery	will  be  attempted  after  at
	   least recovery_wait_time seconds).  If set to 1 (true), the time of
	   the	processed  stream  is  taken  into  account  instead (i.e. the
	   recovery  will  be  attempted  after	 at  least  recovery_wait_time
	   seconds  of the stream is omitted).	By default, this option	is set
	   to 0	(false).

       recover_any_error bool
	   If set to 1 (true), recovery	will be	attempted regardless  of  type
	   of  the error causing the failure. By default this option is	set to
	   0 (false) and in case of certain  (usually  permanent)  errors  the
	   recovery is not attempted even when attempt_recovery	is set to 1.

       restart_with_keyframe bool
	   Specify  whether  to	 wait  for  the	keyframe after recovering from
	   queue overflow or failure. This option  is  set  to	0  (false)  by
	   default.

       timeshift duration
	   Buffer  the	specified  amount  of  packets	and  delay writing the
	   output. Note	that queue_size	 must  be  big	enough	to  store  the
	   packets  for	 timeshift. At the end of the input the	fifo buffer is
	   flushed at realtime speed.

       Examples

          Stream something to rtmp server, continue processing	the stream  at
	   real-time  rate  even in case of temporary failure (network outage)
	   and attempt to recover streaming every second indefinitely.

		   ffmpeg -re -i ... -c:v libx264 -c:a aac -f fifo -fifo_format	flv -map 0:v -map 0:a
		     -drop_pkts_on_overflow 1 -attempt_recovery	1 -recovery_wait_time 1	rtmp://example.com/live/stream_name

   flv
       Adobe Flash Video Format	muxer.

       This muxer accepts the following	options:

       flvflags	flags
	   Possible values:

	   aac_seq_header_detect
	       Place AAC sequence header based on audio	stream data.

	   no_sequence_end
	       Disable sequence	end tag.

	   no_metadata
	       Disable metadata	tag.

	   no_duration_filesize
	       Disable duration	and filesize in	metadata when they  are	 equal
	       to  zero	 at the	end of stream. (Be used	to non-seekable	living
	       stream).

	   add_keyframe_index
	       Used  to	 facilitate  seeking;  particularly  for  HTTP	pseudo
	       streaming.

   framecrc
       Per-packet CRC (Cyclic Redundancy Check)	testing	format.

       This  muxer  computes  and  prints  the Adler-32	CRC for	each audio and
       video packet. By	default	audio frames are converted  to	signed	16-bit
       raw audio and video frames to raw video before computing	the CRC.

       The  output  of	the  muxer consists of a line for each audio and video
       packet of the form:

	       <stream_index>, <packet_dts>, <packet_pts>, <packet_duration>, <packet_size>, 0x<CRC>

       CRC is a	hexadecimal number 0-padded to 8 digits	containing the CRC  of
       the packet.

       Examples

       For  example to compute the CRC of the audio and	video frames in	INPUT,
       converted to raw	audio and video	packets, and  store  it	 in  the  file
       out.crc:

	       ffmpeg -i INPUT -f framecrc out.crc

       To print	the information	to stdout, use the command:

	       ffmpeg -i INPUT -f framecrc -

       With  ffmpeg,  you  can select the output format	to which the audio and
       video frames are	encoded	before computing the CRC for  each  packet  by
       specifying  the	audio and video	codec. For example, to compute the CRC
       of each decoded input audio frame converted to PCM unsigned  8-bit  and
       of  each	 decoded  input	video frame converted to MPEG-2	video, use the
       command:

	       ffmpeg -i INPUT -c:a pcm_u8 -c:v	mpeg2video -f framecrc -

       See also	the crc	muxer.

   framehash
       Per-packet hash testing format.

       This muxer computes and prints a	cryptographic hash for each audio  and
       video  packet.  This  can  be used for packet-by-packet equality	checks
       without having to individually do a binary comparison on	each.

       By default audio	frames are converted to	signed 16-bit  raw  audio  and
       video  frames to	raw video before computing the hash, but the output of
       explicit	conversions to other codecs can	also  be  used.	 It  uses  the
       SHA-256	cryptographic  hash  function by default, but supports several
       other algorithms.

       The output of the muxer consists	of a line for  each  audio  and	 video
       packet of the form:

	       <stream_index>, <packet_dts>, <packet_pts>, <packet_duration>, <packet_size>, <hash>

       hash  is	 a  hexadecimal	 number	representing the computed hash for the
       packet.

       hash algorithm
	   Use	the  cryptographic  hash  function  specified  by  the	string
	   algorithm.  Supported values	include	"MD5", "murmur3", "RIPEMD128",
	   "RIPEMD160",	"RIPEMD256", "RIPEMD320", "SHA160", "SHA224", "SHA256"
	   (default),  "SHA512/224", "SHA512/256", "SHA384", "SHA512", "CRC32"
	   and "adler32".

       Examples

       To compute the SHA-256 hash of the audio	and  video  frames  in	INPUT,
       converted  to  raw  audio  and  video packets, and store	it in the file
       out.sha256:

	       ffmpeg -i INPUT -f framehash out.sha256

       To print	the information	to stdout, using the MD5  hash	function,  use
       the command:

	       ffmpeg -i INPUT -f framehash -hash md5 -

       See also	the hash muxer.

   framemd5
       Per-packet MD5 testing format.

       This  is	 a  variant  of	 the  framehash	 muxer.	 Unlike	that muxer, it
       defaults	to using the MD5 hash function.

       Examples

       To compute the MD5 hash	of  the	 audio	and  video  frames  in	INPUT,
       converted  to  raw  audio  and  video packets, and store	it in the file
       out.md5:

	       ffmpeg -i INPUT -f framemd5 out.md5

       To print	the information	to stdout, use the command:

	       ffmpeg -i INPUT -f framemd5 -

       See also	the framehash and md5 muxers.

   gif
       Animated	GIF muxer.

       It accepts the following	options:

       loop
	   Set the number of times to loop the output. Use "-1"	for no loop, 0
	   for looping indefinitely (default).

       final_delay
	   Force the delay (expressed in centiseconds) after the  last	frame.
	   Each	 frame	ends with a delay until	the next frame.	The default is
	   "-1", which is a special value to tell  the	muxer  to  re-use  the
	   previous delay. In case of a	loop, you might	want to	customize this
	   value to mark a pause for instance.

       For  example,  to encode	a gif looping 10 times,	with a 5 seconds delay
       between the loops:

	       ffmpeg -i INPUT -loop 10	-final_delay 500 out.gif

       Note 1: if you wish to extract the frames into separate GIF files,  you
       need to force the image2	muxer:

	       ffmpeg -i INPUT -c:v gif	-f image2 "out%d.gif"

       Note  2:	 the  GIF format has a very large time base: the delay between
       two frames can therefore	not be smaller than one	centi second.

   hash
       Hash testing format.

       This muxer computes and prints a	cryptographic hash of  all  the	 input
       audio  and  video  frames. This can be used for equality	checks without
       having to do a complete binary comparison.

       By default audio	frames are converted to	signed 16-bit  raw  audio  and
       video  frames to	raw video before computing the hash, but the output of
       explicit	conversions to other codecs can	also be	used.  Timestamps  are
       ignored.	 It  uses  the SHA-256 cryptographic hash function by default,
       but supports several other algorithms.

       The output of the  muxer	 consists  of  a  single  line	of  the	 form:
       algo=hash,  where algo is a short string	representing the hash function
       used, and hash is a hexadecimal number representing the computed	hash.

       hash algorithm
	   Use	the  cryptographic  hash  function  specified  by  the	string
	   algorithm.  Supported values	include	"MD5", "murmur3", "RIPEMD128",
	   "RIPEMD160",	"RIPEMD256", "RIPEMD320", "SHA160", "SHA224", "SHA256"
	   (default),  "SHA512/224", "SHA512/256", "SHA384", "SHA512", "CRC32"
	   and "adler32".

       Examples

       To compute the SHA-256 hash of the input	converted  to  raw  audio  and
       video, and store	it in the file out.sha256:

	       ffmpeg -i INPUT -f hash out.sha256

       To print	an MD5 hash to stdout use the command:

	       ffmpeg -i INPUT -f hash -hash md5 -

       See also	the framehash muxer.

   hls
       Apple  HTTP Live	Streaming muxer	that segments MPEG-TS according	to the
       HTTP Live Streaming (HLS) specification.

       It creates a playlist file, and one or more segment files.  The	output
       filename	specifies the playlist filename.

       By  default,  the muxer creates a file for each segment produced. These
       files have the same name	as the	playlist,  followed  by	 a  sequential
       number and a .ts	extension.

       Make sure to require a closed GOP when encoding and to set the GOP size
       to fit your segment time	constraint.

       For example, to convert an input	file with ffmpeg:

	       ffmpeg -i in.mkv	-c:v h264 -flags +cgop -g 30 -hls_time 1 out.m3u8

       This  example  will  produce the	playlist, out.m3u8, and	segment	files:
       out0.ts,	out1.ts, out2.ts, etc.

       See also	the segment muxer, which provides a more generic and  flexible
       implementation  of  a  segmenter,  and  can  be	used  to  perform  HLS
       segmentation.

       Options

       This muxer supports the following options:

       hls_init_time duration
	   Set the initial target segment length. Default value	is 0.

	   duration must be  a	time  duration	specification,	see  the  Time
	   duration section in the ffmpeg-utils(1) manual.

	   Segment  will  be  cut  on  the  next key frame after this time has
	   passed on the first m3u8  list.   After  the	 initial  playlist  is
	   filled ffmpeg will cut segments at duration equal to	"hls_time"

       hls_time	duration
	   Set the target segment length. Default value	is 2.

	   duration  must  be  a  time	duration  specification,  see the Time
	   duration section in the ffmpeg-utils(1) manual.   Segment  will  be
	   cut on the next key frame after this	time has passed.

       hls_list_size size
	   Set	the  maximum  number of	playlist entries. If set to 0 the list
	   file	will contain all the segments. Default value is	5.

       hls_delete_threshold size
	   Set the number of unreferenced segments  to	keep  on  disk	before
	   "hls_flags  delete_segments"	 deletes  them.	Increase this to allow
	   continue  clients  to  download  segments   which   were   recently
	   referenced  in  the	playlist. Default value	is 1, meaning segments
	   older than "hls_list_size+1"	will be	deleted.

       hls_start_number_source
	   Start  the  playlist	 sequence   number   ("#EXT-X-MEDIA-SEQUENCE")
	   according  to the specified source.	Unless "hls_flags single_file"
	   is set, it also specifies source of starting	 sequence  numbers  of
	   segment   and  subtitle  filenames.	In  any	 case,	if  "hls_flags
	   append_list"	is set and read	playlist sequence  number  is  greater
	   than	 the  specified	start sequence number, then that value will be
	   used	as start value.

	   It accepts the following values:

	   generic (default)
	       Set the starting	sequence  numbers  according  to  start_number
	       option value.

	   epoch
	       The  start  number  will	be the seconds since epoch (1970-01-01
	       00:00:00)

	   epoch_us
	       The  start  number  will	 be  the  microseconds	 since	 epoch
	       (1970-01-01 00:00:00)

	   datetime
	       The  start  number  will	 be  based on the current date/time as
	       YYYYmmddHHMMSS. e.g. 20161231235759.

       start_number number
	   Start the playlist sequence number  ("#EXT-X-MEDIA-SEQUENCE")  from
	   the specified number	when hls_start_number_source value is generic.
	   (This is the	default	case.)	Unless "hls_flags single_file" is set,
	   it also specifies starting sequence numbers of segment and subtitle
	   filenames.  Default value is	0.

       hls_allow_cache allowcache
	   Explicitly  set  whether  the  client MAY (1) or MUST NOT (0) cache
	   media segments.

       hls_base_url baseurl
	   Append baseurl to every entry in the	playlist.  Useful to  generate
	   playlists with absolute paths.

	   Note	 that  the  playlist  sequence	number must be unique for each
	   segment and it is not to be	confused  with	the  segment  filename
	   sequence number which can be	cyclic,	for example if the wrap	option
	   is specified.

       hls_segment_filename filename
	   Set	the  segment  filename.	Unless "hls_flags single_file" is set,
	   filename is used as a string	format with the	segment	number:

		   ffmpeg -i in.nut -hls_segment_filename 'file%03d.ts'	out.m3u8

	   This	example	will  produce  the  playlist,  out.m3u8,  and  segment
	   files: file000.ts, file001.ts, file002.ts, etc.

	   filename  may contain full path or relative path specification, but
	   only	the file name part without any path info will be contained  in
	   the	m3u8  segment  list.  Should a relative	path be	specified, the
	   path	of the created segment files will be relative to  the  current
	   working  directory.	When strftime_mkdir is set, the	whole expanded
	   value of filename will be written into the m3u8 segment list.

	   When	"var_stream_map" is set	with two or more variant streams,  the
	   filename   pattern  must  contain  the  string  "%v",  this	string
	   specifies the position of variant stream  index  in	the  generated
	   segment file	names.

		   ffmpeg -i in.ts -b:v:0 1000k	-b:v:1 256k -b:a:0 64k -b:a:1 32k \
		     -map 0:v -map 0:a -map 0:v	-map 0:a -f hls	-var_stream_map	"v:0,a:0 v:1,a:1" \
		     -hls_segment_filename 'file_%v_%03d.ts' out_%v.m3u8

	   This	  example  will	 produce  the  playlists  segment  file	 sets:
	   file_0_000.ts,    file_0_001.ts,    file_0_002.ts,	  etc.	   and
	   file_1_000.ts, file_1_001.ts, file_1_002.ts,	etc.

	   The	string	"%v"  may  be  present	in the filename	or in the last
	   directory name containing the  file,	 but  only  in	one  of	 them.
	   (Additionally,  %v  may  appear  multiple  times  in	 the last sub-
	   directory or	 filename.)  If	 the  string  %v  is  present  in  the
	   directory  name,  then  sub-directories are created after expanding
	   the directory name  pattern.	 This  enables	creation  of  segments
	   corresponding to different variant streams in subdirectories.

		   ffmpeg -i in.ts -b:v:0 1000k	-b:v:1 256k -b:a:0 64k -b:a:1 32k \
		     -map 0:v -map 0:a -map 0:v	-map 0:a -f hls	-var_stream_map	"v:0,a:0 v:1,a:1" \
		     -hls_segment_filename 'vs%v/file_%03d.ts' vs%v/out.m3u8

	   This	  example  will	 produce  the  playlists  segment  file	 sets:
	   vs0/file_000.ts,   vs0/file_001.ts,	 vs0/file_002.ts,   etc.   and
	   vs1/file_000.ts, vs1/file_001.ts, vs1/file_002.ts, etc.

       strftime
	   Use	strftime()  on	filename  to  expand the segment filename with
	   localtime.  The segment number is also available in this mode,  but
	   to  use it, you need	to specify second_level_segment_index hls_flag
	   and %%d will	be the specifier.

		   ffmpeg -i in.nut -strftime 1	-hls_segment_filename 'file-%Y%m%d-%s.ts' out.m3u8

	   This	example	will  produce  the  playlist,  out.m3u8,  and  segment
	   files:   file-20160215-1455569023.ts,  file-20160215-1455569024.ts,
	   etc.	 Note: On some systems/environments, the %s specifier  is  not
	   available. See
	     "strftime()" documentation.

		   ffmpeg -i in.nut -strftime 1	-hls_flags second_level_segment_index -hls_segment_filename 'file-%Y%m%d-%%04d.ts' out.m3u8

	   This	 example  will	produce	 the  playlist,	 out.m3u8, and segment
	   files: file-20160215-0001.ts, file-20160215-0002.ts,	etc.

       strftime_mkdir
	   Used	 together   with   -strftime_mkdir,   it   will	  create   all
	   subdirectories which	is expanded in filename.

		   ffmpeg -i in.nut -strftime 1	-strftime_mkdir	1 -hls_segment_filename	'%Y%m%d/file-%Y%m%d-%s.ts' out.m3u8

	   This	 example  will	create	a  directory 201560215 (if it does not
	   exist), and then produce the	playlist, out.m3u8, and	segment	files:
	   20160215/file-20160215-1455569023.ts,
	   20160215/file-20160215-1455569024.ts, etc.

		   ffmpeg -i in.nut -strftime 1	-strftime_mkdir	1 -hls_segment_filename	'%Y/%m/%d/file-%Y%m%d-%s.ts' out.m3u8

	   This	example	will create a directory	hierarchy 2016/02/15  (if  any
	   of them do not exist), and then produce the playlist, out.m3u8, and
	   segment	  files:       2016/02/15/file-20160215-1455569023.ts,
	   2016/02/15/file-20160215-1455569024.ts, etc.

       hls_segment_options options_list
	   Set output format options using a  :-separated  list	 of  key=value
	   parameters.	Values	containing  ":"	 special  characters  must  be
	   escaped.

       hls_key_info_file key_info_file
	   Use the information in key_info_file	for  segment  encryption.  The
	   first  line	of  key_info_file specifies the	key URI	written	to the
	   playlist. The key URL is used to access the encryption  key	during
	   playback.  The  second line specifies the path to the key file used
	   to obtain the key during the	encryption process. The	 key  file  is
	   read	 as  a	single packed array of 16 octets in binary format. The
	   optional third line specifies the initialization vector (IV)	 as  a
	   hexadecimal	string	to  be	used  instead  of the segment sequence
	   number (default) for	 encryption.  Changes  to  key_info_file  will
	   result  in  segment	encryption with	the new	key/IV and an entry in
	   the playlist	for the	new key	URI/IV if  "hls_flags  periodic_rekey"
	   is enabled.

	   Key info file format:

		   <key	URI>
		   <key	file path>
		   <IV>	(optional)

	   Example key URIs:

		   http://server/file.key
		   /path/to/file.key
		   file.key

	   Example key file paths:

		   file.key
		   /path/to/file.key

	   Example IV:

		   0123456789ABCDEF0123456789ABCDEF

	   Key info file example:

		   http://server/file.key
		   /path/to/file.key
		   0123456789ABCDEF0123456789ABCDEF

	   Example shell script:

		   #!/bin/sh
		   BASE_URL=${1:-'.'}
		   openssl rand	16 > file.key
		   echo	$BASE_URL/file.key > file.keyinfo
		   echo	file.key >> file.keyinfo
		   echo	$(openssl rand -hex 16)	>> file.keyinfo
		   ffmpeg -f lavfi -re -i testsrc -c:v h264 -hls_flags delete_segments \
		     -hls_key_info_file	file.keyinfo out.m3u8

       -hls_enc	enc
	   Enable  (1)	or  disable  (0)  the AES128 encryption.  When enabled
	   every segment generated is encrypted	 and  the  encryption  key  is
	   saved as playlist name.key.

       -hls_enc_key key
	   16-octet  key  to  encrypt  the segments, by	default	it is randomly
	   generated.

       -hls_enc_key_url	keyurl
	   If set, keyurl is prepended instead of baseurl to the key  filename
	   in the playlist.

       -hls_enc_iv iv
	   16-octet  initialization  vector  for  every	segment	instead	of the
	   autogenerated ones.

       hls_segment_type	flags
	   Possible values:

	   mpegts
	       Output segment files in MPEG-2 Transport	Stream format. This is
	       compatible with all HLS versions.

	   fmp4
	       Output segment files in fragmented MP4 format, similar to MPEG-
	       DASH.  fmp4 files may be	used in	HLS version 7 and above.

       hls_fmp4_init_filename filename
	   Set filename	to the fragment	files header file, default filename is
	   init.mp4.

	   Use "-strftime 1" on	filename to expand the segment	filename  with
	   localtime.

		   ffmpeg -i in.nut  -hls_segment_type fmp4 -strftime 1	-hls_fmp4_init_filename	"%s_init.mp4" out.m3u8

	   This	will produce init like this 1602678741_init.mp4

       hls_fmp4_init_resend
	   Resend init file after m3u8 file refresh every time,	default	is 0.

	   When	 "var_stream_map" is set with two or more variant streams, the
	   filename  pattern  must  contain  the  string  "%v",	 this	string
	   specifies  the  position  of	 variant stream	index in the generated
	   init	file names.  The string	"%v" may be present in the filename or
	   in the last directory name containing the file. If  the  string  is
	   present  in	the  directory	name, then sub-directories are created
	   after expanding the directory name pattern. This  enables  creation
	   of  init  files  corresponding  to  different  variant  streams  in
	   subdirectories.

       hls_flags flags
	   Possible values:

	   single_file
	       If this flag is set, the	muxer will store  all  segments	 in  a
	       single  MPEG-TS file, and will use byte ranges in the playlist.
	       HLS playlists generated with this way  will  have  the  version
	       number 4.  For example:

		       ffmpeg -i in.nut	-hls_flags single_file out.m3u8

	       Will produce the	playlist, out.m3u8, and	a single segment file,
	       out.ts.

	   delete_segments
	       Segment	files  removed	from  the playlist are deleted after a
	       period of time equal to the duration of the  segment  plus  the
	       duration	of the playlist.

	   append_list
	       Append  new  segments  into  the	 end  of old segment list, and
	       remove the "#EXT-X-ENDLIST" from	the old	segment	list.

	   round_durations
	       Round the duration info in the playlist file  segment  info  to
	       integer	values,	instead	of using floating point.  If there are
	       no other	features requiring higher HLS versions be  used,  then
	       this will allow ffmpeg to output	a HLS version 2	m3u8.

	   discont_start
	       Add  the	"#EXT-X-DISCONTINUITY" tag to the playlist, before the
	       first segment's information.

	   omit_endlist
	       Do not append  the  "EXT-X-ENDLIST"  tag	 at  the  end  of  the
	       playlist.

	   periodic_rekey
	       The  file  specified  by	 "hls_key_info_file"  will  be checked
	       periodically and	detect updates to the encryption info. Be sure
	       to replace this file atomically,	including the file  containing
	       the AES encryption key.

	   independent_segments
	       Add  the	 "#EXT-X-INDEPENDENT-SEGMENTS"	to  playlists that has
	       video segments and when all the segments	of that	 playlist  are
	       guaranteed to start with	a Key frame.

	   iframes_only
	       Add  the	 "#EXT-X-I-FRAMES-ONLY"	 to  playlists	that has video
	       segments	and can	play only I-frames in  the  "#EXT-X-BYTERANGE"
	       mode.

	   split_by_time
	       Allow  segments	to  start on frames other than keyframes. This
	       improves	 behavior  on  some  players  when  the	 time  between
	       keyframes is inconsistent, but may make things worse on others,
	       and can cause some oddities during seeking. This	flag should be
	       used with the "hls_time"	option.

	   program_date_time
	       Generate	"EXT-X-PROGRAM-DATE-TIME" tags.

	   second_level_segment_index
	       Makes   it   possible   to   use	 segment  indexes  as  %%d  in
	       hls_segment_filename expression besides date/time  values  when
	       strftime	 is  on.   To  get  fixed  width numbers with trailing
	       zeroes, %%0xd format is	available  where  x  is	 the  required
	       width.

	   second_level_segment_size
	       Makes  it  possible  to use segment sizes (counted in bytes) as
	       %%s in hls_segment_filename expression besides date/time	values
	       when strftime is	on.  To	get fixed width	numbers	with  trailing
	       zeroes,	%%0xs  format  is  available  where  x is the required
	       width.

	   second_level_segment_duration
	       Makes it	possible  to  use  segment  duration  (calculated   in
	       microseconds) as	%%t in hls_segment_filename expression besides
	       date/time  values  when	strftime  is  on.   To get fixed width
	       numbers with trailing zeroes, %%0xt format is available where x
	       is the required width.

		       ffmpeg -i sample.mpeg \
			  -f hls -hls_time 3 -hls_list_size 5 \
			  -hls_flags second_level_segment_index+second_level_segment_size+second_level_segment_duration	\
			  -strftime 1 -strftime_mkdir 1	-hls_segment_filename "segment_%Y%m%d%H%M%S_%%04d_%%08s_%%013t.ts" stream.m3u8

	       This	 will	   produce	segments      like	 this:
	       segment_20170102194334_0003_00122200_0000003000000.ts,
	       segment_20170102194334_0004_00120072_0000003000000.ts etc.

	   temp_file
	       Write  segment data to filename.tmp and rename to filename only
	       once the	segment	is complete. A webserver serving  up  segments
	       can be configured to reject requests to *.tmp to	prevent	access
	       to in-progress segments before they have	been added to the m3u8
	       playlist.  This	flag  also affects how m3u8 playlist files are
	       created.	 If this flag is set, all playlist files will  written
	       into  temporary	file  and  renamed  after  they	 are complete,
	       similarly as segments are handled.  But playlists  with	"file"
	       protocol	 and  with type	("hls_playlist_type") other than "vod"
	       are always written into temporary file regardless of this flag.
	       Master playlist files ("master_pl_name"), if any,  with	"file"
	       protocol,  are always written into temporary file regardless of
	       this flag if "master_pl_publish_rate" value is other than zero.

       hls_playlist_type event
	   Emit	 "#EXT-X-PLAYLIST-TYPE:EVENT"  in  the	m3u8  header.	Forces
	   hls_list_size to 0; the playlist can	only be	appended to.

       hls_playlist_type vod
	   Emit	  "#EXT-X-PLAYLIST-TYPE:VOD"   in   the	 m3u8  header.	Forces
	   hls_list_size to 0; the playlist must not change.

       method
	   Use the given HTTP method to	create the hls files.

		   ffmpeg -re -i in.ts -f hls -method PUT http://example.com/live/out.m3u8

	   This	example	will upload all	the mpegts segment files to  the  HTTP
	   server  using  the HTTP PUT method, and update the m3u8 files every
	   "refresh" times using the same method.  Note	that the  HTTP	server
	   must	support	the given method for uploading files.

       http_user_agent
	   Override  User-Agent	field in HTTP header. Applicable only for HTTP
	   output.

       var_stream_map
	   Map string which specifies  how  to	group  the  audio,  video  and
	   subtitle streams into different variant streams. The	variant	stream
	   groups are separated	by space.  Expected string format is like this
	   "a:0,v:0  a:1,v:1  ....".  Here  a:,	v:, s: are the keys to specify
	   audio, video	and subtitle streams respectively.  Allowed values are
	   0 to	9 (limited just	based on practical usage).

	   When	there are two or more variant  streams,	 the  output  filename
	   pattern  must  contain  the	string "%v", this string specifies the
	   position of variant stream  index  in  the  output  media  playlist
	   filenames. The string "%v" may be present in	the filename or	in the
	   last	 directory  name containing the	file. If the string is present
	   in the directory  name,  then  sub-directories  are	created	 after
	   expanding  the  directory  name  pattern.  This enables creation of
	   variant streams in subdirectories.

		   ffmpeg -re -i in.ts -b:v:0 1000k -b:v:1 256k	-b:a:0 64k -b:a:1 32k \
		     -map 0:v -map 0:a -map 0:v	-map 0:a -f hls	-var_stream_map	"v:0,a:0 v:1,a:1" \
		     http://example.com/live/out_%v.m3u8

	   This	example	creates	two hls	variant	 streams.  The	first  variant
	   stream  will	contain	video stream of	bitrate	1000k and audio	stream
	   of bitrate 64k and the second variant  stream  will	contain	 video
	   stream  of  bitrate 256k and	audio stream of	bitrate	32k. Here, two
	   media playlist with file names out_0.m3u8 and  out_1.m3u8  will  be
	   created.  If	 you want something meaningful text instead of indexes
	   in result names, you	may specify names for  each  or	 some  of  the
	   variants as in the following	example.

		   ffmpeg -re -i in.ts -b:v:0 1000k -b:v:1 256k	-b:a:0 64k -b:a:1 32k \
		     -map 0:v -map 0:a -map 0:v	-map 0:a -f hls	-var_stream_map	"v:0,a:0,name:my_hd v:1,a:1,name:my_sd"	\
		     http://example.com/live/out_%v.m3u8

	   This	 example  creates  two	hls variant streams as in the previous
	   one.	  But  here,  the  two	media	playlist   with	  file	 names
	   out_my_hd.m3u8 and out_my_sd.m3u8 will be created.

		   ffmpeg -re -i in.ts -b:v:0 1000k -b:v:1 256k	-b:a:0 64k \
		     -map 0:v -map 0:a -map 0:v	-f hls -var_stream_map "v:0 a:0	v:1" \
		     http://example.com/live/out_%v.m3u8

	   This	 example  creates three	hls variant streams. The first variant
	   stream will be a video only stream with video  bitrate  1000k,  the
	   second variant stream will be an audio only stream with bitrate 64k
	   and	the  third  variant  stream  will  be a	video only stream with
	   bitrate  256k.  Here,  three	 media	playlist   with	  file	 names
	   out_0.m3u8, out_1.m3u8 and out_2.m3u8 will be created.

		   ffmpeg -re -i in.ts -b:v:0 1000k -b:v:1 256k	-b:a:0 64k -b:a:1 32k \
		     -map 0:v -map 0:a -map 0:v	-map 0:a -f hls	-var_stream_map	"v:0,a:0 v:1,a:1" \
		     http://example.com/live/vs_%v/out.m3u8

	   This	 example  creates the variant streams in subdirectories. Here,
	   the	   first      media	 playlist      is      created	    at
	   http://example.com/live/vs_0/out.m3u8   and	 the   second  one  at
	   http://example.com/live/vs_1/out.m3u8.

		   ffmpeg -re -i in.ts -b:a:0 32k -b:a:1 64k -b:v:0 1000k -b:v:1 3000k	\
		     -map 0:a -map 0:a -map 0:v	-map 0:v -f hls	\
		     -var_stream_map "a:0,agroup:aud_low a:1,agroup:aud_high v:0,agroup:aud_low	v:1,agroup:aud_high" \
		     -master_pl_name master.m3u8 \
		     http://example.com/live/out_%v.m3u8

	   This	example	creates	two audio only	and  two  video	 only  variant
	   streams.  In	addition to the	#EXT-X-STREAM-INF tag for each variant
	   stream in the master	playlist, #EXT-X-MEDIA tag is also  added  for
	   the	two  audio only	variant	streams	and they are mapped to the two
	   video only variant streams with audio  group	 names	'aud_low'  and
	   'aud_high'.

	   By default, a single	hls variant containing all the encoded streams
	   is created.

		   ffmpeg -re -i in.ts -b:a:0 32k -b:a:1 64k -b:v:0 1000k \
		     -map 0:a -map 0:a -map 0:v	-f hls \
		     -var_stream_map "a:0,agroup:aud_low,default:yes a:1,agroup:aud_low	v:0,agroup:aud_low" \
		     -master_pl_name master.m3u8 \
		     http://example.com/live/out_%v.m3u8

	   This	 example  creates  two	audio  only and	one video only variant
	   streams. In addition	to the #EXT-X-STREAM-INF tag for each  variant
	   stream  in  the master playlist, #EXT-X-MEDIA tag is	also added for
	   the two audio only variant streams and they are mapped to  the  one
	   video only variant streams with audio group name 'aud_low', and the
	   audio group have default stat is NO or YES.

	   By default, a single	hls variant containing all the encoded streams
	   is created.

		   ffmpeg -re -i in.ts -b:a:0 32k -b:a:1 64k -b:v:0 1000k \
		     -map 0:a -map 0:a -map 0:v	-f hls \
		     -var_stream_map "a:0,agroup:aud_low,default:yes,language:ENG a:1,agroup:aud_low,language:CHN v:0,agroup:aud_low" \
		     -master_pl_name master.m3u8 \
		     http://example.com/live/out_%v.m3u8

	   This	 example  creates  two	audio  only and	one video only variant
	   streams. In addition	to the #EXT-X-STREAM-INF tag for each  variant
	   stream  in  the master playlist, #EXT-X-MEDIA tag is	also added for
	   the two audio only variant streams and they are mapped to  the  one
	   video only variant streams with audio group name 'aud_low', and the
	   audio  group	have default stat is NO	or YES,	and one	audio have and
	   language is named ENG, the other audio language is named CHN.

	   By default, a single	hls variant containing all the encoded streams
	   is created.

		   ffmpeg -y -i	input_with_subtitle.mkv	\
		    -b:v:0 5250k -c:v h264 -pix_fmt yuv420p -profile:v main -level 4.1 \
		    -b:a:0 256k	\
		    -c:s webvtt	-c:a mp2 -ar 48000 -ac 2 -map 0:v -map 0:a:0 -map 0:s:0	\
		    -f hls -var_stream_map "v:0,a:0,s:0,sgroup:subtitle" \
		    -master_pl_name master.m3u8	-t 300 -hls_time 10 -hls_init_time 4 -hls_list_size \
		    10 -master_pl_publish_rate 10  -hls_flags \
		    delete_segments+discont_start+split_by_time	./tmp/video.m3u8

	   This	example	adds "#EXT-X-MEDIA" tag	with "TYPE=SUBTITLES"  in  the
	   master  playlist with webvtt	subtitle group name 'subtitle'.	Please
	   make	sure the input file has	one text subtitle stream at least.

       cc_stream_map
	   Map string which specifies different	 closed	 captions  groups  and
	   their  attributes.  The closed captions stream groups are separated
	   by space.  Expected string  format  is  like	 this  "ccgroup:<group
	   name>,instreamid:<INSTREAM-ID>,language:<language	code>	....".
	   'ccgroup' and 'instreamid' are mandatory attributes.	'language'  is
	   an optional attribute.  The closed captions groups configured using
	   this	 option	 are  mapped to	different variant streams by providing
	   the	same  'ccgroup'	 name  in  the	"var_stream_map"  string.   If
	   "var_stream_map"  is	 not  set, then	the first available ccgroup in
	   "cc_stream_map"  is	mapped	to  the	 output	 variant  stream.  The
	   examples for	these two use cases are	given below.

		   ffmpeg -re -i in.ts -b:v 1000k -b:a 64k -a53cc 1 -f hls \
		     -cc_stream_map "ccgroup:cc,instreamid:CC1,language:en" \
		     -master_pl_name master.m3u8 \
		     http://example.com/live/out.m3u8

	   This	example	adds "#EXT-X-MEDIA" tag	with "TYPE=CLOSED-CAPTIONS" in
	   the	master	playlist with group name 'cc', language	'en' (english)
	   and INSTREAM-ID 'CC1'. Also,	it  adds  "CLOSED-CAPTIONS"  attribute
	   with	group name 'cc'	for the	output variant stream.

		   ffmpeg -re -i in.ts -b:v:0 1000k -b:v:1 256k	-b:a:0 64k -b:a:1 32k \
		     -a53cc:0 1	-a53cc:1 1\
		     -map 0:v -map 0:a -map 0:v	-map 0:a -f hls	\
		     -cc_stream_map "ccgroup:cc,instreamid:CC1,language:en ccgroup:cc,instreamid:CC2,language:sp" \
		     -var_stream_map "v:0,a:0,ccgroup:cc v:1,a:1,ccgroup:cc" \
		     -master_pl_name master.m3u8 \
		     http://example.com/live/out_%v.m3u8

	   This	    example	adds	 two	"#EXT-X-MEDIA"	  tags	  with
	   "TYPE=CLOSED-CAPTIONS" in the master	playlist for the  INSTREAM-IDs
	   'CC1'  and  'CC2'.  Also,  it adds "CLOSED-CAPTIONS"	attribute with
	   group name 'cc' for the two output variant streams.

       master_pl_name
	   Create HLS master playlist with the given name.

		   ffmpeg -re -i in.ts -f hls -master_pl_name master.m3u8 http://example.com/live/out.m3u8

	   This	example	creates	HLS master playlist with name master.m3u8  and
	   it is published at http://example.com/live/

       master_pl_publish_rate
	   Publish master play list repeatedly every after specified number of
	   segment intervals.

		   ffmpeg -re -i in.ts -f hls -master_pl_name master.m3u8 \
		   -hls_time 2 -master_pl_publish_rate 30 http://example.com/live/out.m3u8

	   This	 example creates HLS master playlist with name master.m3u8 and
	   keep	publishing it repeatedly every after 30	 segments  i.e.	 every
	   after 60s.

       http_persistent
	   Use persistent HTTP connections. Applicable only for	HTTP output.

       timeout
	   Set	timeout	 for  socket  I/O operations. Applicable only for HTTP
	   output.

       ignore_io_errors
	   Ignore IO errors during open, write and delete.  Useful  for	 long-
	   duration runs with network output.

       headers
	   Set	custom	HTTP  headers,	can override built in default headers.
	   Applicable only for HTTP output.

   ico
       ICO file	muxer.

       Microsoft's icon	file format (ICO) has  some  strict  limitations  that
       should be noted:

          Size	cannot exceed 256 pixels in any	dimension

          Only	BMP and	PNG images can be stored

          If  a  BMP  image  is  used,	 it must be one	of the following pixel
	   formats:

		   BMP Bit Depth      FFmpeg Pixel Format
		   1bit		      pal8
		   4bit		      pal8
		   8bit		      pal8
		   16bit	      rgb555le
		   24bit	      bgr24
		   32bit	      bgra

          If a	BMP image is used, it must use the BITMAPINFOHEADER DIB	header

          If a	PNG image is used, it must use the rgba	pixel format

   image2
       Image file muxer.

       The image file muxer writes video frames	to image files.

       The output filenames are	specified by a pattern,	which can be  used  to
       produce sequentially numbered series of files.  The pattern may contain
       the  string  "%d"  or "%0Nd", this string specifies the position	of the
       characters representing a numbering  in	the  filenames.	 If  the  form
       "%0Nd"  is used,	the string representing	the number in each filename is
       0-padded	to N digits. The literal character '%' can be specified	in the
       pattern with the	string "%%".

       If the pattern contains "%d" or "%0Nd", the first filename of the  file
       list  specified	will  contain  the number 1, all the following numbers
       will be sequential.

       The pattern may	contain	 a  suffix  which  is  used  to	 automatically
       determine the format of the image files to write.

       For  example  the  pattern  "img-%03d.bmp"  will	 specify a sequence of
       filenames of the	form img-001.bmp, img-002.bmp, ..., img-010.bmp,  etc.
       The  pattern "img%%-%d.jpg" will	specify	a sequence of filenames	of the
       form img%-1.jpg,	img%-2.jpg, ..., img%-10.jpg, etc.

       The image muxer supports	the .Y.U.V image file format. This  format  is
       special in that that each image frame consists of three files, for each
       of  the	YUV420P	 components.  To read or write this image file format,
       specify the name	of the '.Y' file. The muxer  will  automatically  open
       the '.U'	and '.V' files as required.

       Options

       frame_pts
	   If  set  to 1, expand the filename with pts from pkt->pts.  Default
	   value is 0.

       start_number
	   Start the sequence from the specified number. Default value is 1.

       update
	   If set to 1,	the filename will always  be  interpreted  as  just  a
	   filename,  not  a  pattern,	and  the  corresponding	 file  will be
	   continuously	overwritten with new images. Default value is 0.

       strftime
	   If set to 1,	expand the filename with  date	and  time  information
	   from	"strftime()". Default value is 0.

       atomic_writing
	   Write  output  to  a	 temporary  file,  which  is renamed to	target
	   filename once writing is completed. Default is disabled.

       protocol_opts options_list
	   Set protocol	options	as a :-separated list of key=value parameters.
	   Values containing the ":" special character must be escaped.

       Examples

       The following example shows how to use ffmpeg for creating  a  sequence
       of files	img-001.jpeg, img-002.jpeg, ..., taking	one image every	second
       from the	input video:

	       ffmpeg -i in.avi	-vsync cfr -r 1	-f image2 'img-%03d.jpeg'

       Note  that  with	 ffmpeg,  if the format	is not specified with the "-f"
       option and the output filename specifies	 an  image  file  format,  the
       image2  muxer is	automatically selected,	so the previous	command	can be
       written as:

	       ffmpeg -i in.avi	-vsync cfr -r 1	'img-%03d.jpeg'

       Note also that the pattern must not necessarily contain "%d" or "%0Nd",
       for example to create a single image file img.jpeg from	the  start  of
       the input video you can employ the command:

	       ffmpeg -i in.avi	-f image2 -frames:v 1 img.jpeg

       The  strftime  option  allows  you to expand the	filename with date and
       time information. Check the documentation of the	"strftime()"  function
       for the syntax.

       For   example   to   generate   image   files   from  the  "strftime()"
       "%Y-%m-%d_%H-%M-%S" pattern, the	following ffmpeg command can be	used:

	       ffmpeg -f v4l2 -r 1 -i /dev/video0 -f image2 -strftime 1	"%Y-%m-%d_%H-%M-%S.jpg"

       You can set the file name with current frame's PTS:

	       ffmpeg -f v4l2 -r 1 -i /dev/video0 -copyts -f image2 -frame_pts true %d.jpg

       A more complex example is to publish contents of	your desktop  directly
       to a WebDAV server every	second:

	       ffmpeg -f x11grab -framerate 1 -i :0.0 -q:v 6 -update 1 -protocol_opts method=PUT http://example.com/desktop.jpg

   matroska
       Matroska	container muxer.

       This muxer implements the matroska and webm container specs.

       Metadata

       The recognized metadata settings	in this	muxer are:

       title
	   Set	title name provided to a single	track. This gets mapped	to the
	   FileDescription element for a stream	written	as attachment.

       language
	   Specify the language	of the track in	the Matroska languages form.

	   The language	can be either the 3  letters  bibliographic  ISO-639-2
	   (ISO	 639-2/B)  form	 (like	"fre"  for French), or a language code
	   mixed with a	country	code for specialities in languages (like "fre-
	   ca" for Canadian French).

       stereo_mode
	   Set stereo 3D video layout of two views in a	single video track.

	   The following values	are recognized:

	   mono
	       video is	not stereo

	   left_right
	       Both views are arranged side by side, Left-eye view is  on  the
	       left

	   bottom_top
	       Both  views  are	 arranged  in top-bottom orientation, Left-eye
	       view is at bottom

	   top_bottom
	       Both views are arranged	in  top-bottom	orientation,  Left-eye
	       view is on top

	   checkerboard_rl
	       Each  view  is  arranged	in a checkerboard interleaved pattern,
	       Left-eye	view being first

	   checkerboard_lr
	       Each view is arranged in	a  checkerboard	 interleaved  pattern,
	       Right-eye view being first

	   row_interleaved_rl
	       Each view is constituted	by a row based interleaving, Right-eye
	       view is first row

	   row_interleaved_lr
	       Each  view is constituted by a row based	interleaving, Left-eye
	       view is first row

	   col_interleaved_rl
	       Both views are arranged in a column based interleaving  manner,
	       Right-eye view is first column

	   col_interleaved_lr
	       Both  views are arranged	in a column based interleaving manner,
	       Left-eye	view is	first column

	   anaglyph_cyan_red
	       All frames are in anaglyph  format  viewable  through  red-cyan
	       filters

	   right_left
	       Both  views are arranged	side by	side, Right-eye	view is	on the
	       left

	   anaglyph_green_magenta
	       All frames are  in  anaglyph  format  viewable  through	green-
	       magenta filters

	   block_lr
	       Both eyes laced in one Block, Left-eye view is first

	   block_rl
	       Both eyes laced in one Block, Right-eye view is first

       For  example  a 3D WebM clip can	be created using the following command
       line:

	       ffmpeg -i sample_left_right_clip.mpg -an	-c:v libvpx -metadata stereo_mode=left_right -y	stereo_clip.webm

       Options

       This muxer supports the following options:

       reserve_index_space
	   By default, this muxer writes the index for seeking (called cues in
	   Matroska terms) at the end of the file, because it cannot  know  in
	   advance  how	 much space to leave for the index at the beginning of
	   the file. However for some  use  cases  --  e.g.   streaming	 where
	   seeking  is	possible  but slow -- it is useful to put the index at
	   the beginning of the	file.

	   If this option is set to a non-zero value, the muxer	will reserve a
	   given amount	of space in the	file header and	then try to write  the
	   cues	there when the muxing finishes.	If the reserved	space does not
	   suffice,  no	 Cues  will be written,	the file will be finalized and
	   writing the trailer will return an error.  A	safe size for most use
	   cases should	be about 50kB per hour of video.

	   Note	that cues are only written if the output is seekable and  this
	   option will have no effect if it is not.

       cues_to_front
	   If set, the muxer will write	the index at the beginning of the file
	   by  shifting	 the main data if necessary. This can be combined with
	   reserve_index_space in which	case the data is only shifted  if  the
	   initially reserved space turns out to be insufficient.

	   This	option is ignored if the output	is unseekable.

       default_mode
	   This	 option	controls how the FlagDefault of	the output tracks will
	   be set.  It influences which	tracks players should play by default.
	   The default mode is passthrough.

	   infer
	       Every track with	disposition default will have the  FlagDefault
	       set.   Additionally,  for  each	type of	track (audio, video or
	       subtitle), if no	track with disposition default	of  this  type
	       exists,	then  the  first  track	of this	type will be marked as
	       default (if existing). This ensures that	the  default  flag  is
	       set  in	a  sensible  way  even	if  the	 input originated from
	       containers that lack the	concept	of default tracks.

	   infer_no_subs
	       This mode is the	same as	infer except that if no	subtitle track
	       with disposition	default	exists,	 no  subtitle  track  will  be
	       marked as default.

	   passthrough
	       In  this	 mode  the  FlagDefault	 is  set  if  and  only	if the
	       AV_DISPOSITION_DEFAULT flag is set in the  disposition  of  the
	       corresponding stream.

       flipped_raw_rgb
	   If  set  to	true, store positive height for	raw RGB	bitmaps, which
	   indicates bitmap is stored bottom-up. Note that  this  option  does
	   not	flip the bitmap	which has to be	done manually beforehand, e.g.
	   by using the	vflip filter.  Default is false	and  indicates	bitmap
	   is stored top down.

   md5
       MD5 testing format.

       This  is	a variant of the hash muxer. Unlike that muxer,	it defaults to
       using the MD5 hash function.

       Examples

       To compute the MD5 hash of the input converted to raw audio and	video,
       and store it in the file	out.md5:

	       ffmpeg -i INPUT -f md5 out.md5

       You can print the MD5 to	stdout with the	command:

	       ffmpeg -i INPUT -f md5 -

       See also	the hash and framemd5 muxers.

   mov,	mp4, ismv
       MOV/MP4/ISMV (Smooth Streaming) muxer.

       The mov/mp4/ismv	muxer supports fragmentation. Normally,	a MOV/MP4 file
       has  all	the metadata about all packets stored in one location (written
       at the end of the file, it  can	be  moved  to  the  start  for	better
       playback	 by  adding  "+faststart" to the "-movflags", or using the qt-
       faststart tool).

       A fragmented file consists of a number of fragments, where packets  and
       metadata	 about these packets are stored	together. Writing a fragmented
       file has	the advantage that the file is decodable even if  the  writing
       is  interrupted	(while	a  normal  MOV/MP4 is undecodable if it	is not
       properly	finished), and it requires less	memory when writing very  long
       files  (since  writing  normal  MOV/MP4	files  stores info about every
       single packet in	memory until the file is closed). The downside is that
       it is less compatible with other	applications.

       Fragmentation is	enabled	by setting one of the options that define  how
       to   cut	 the  file  into  fragments:  "-frag_duration",	 "-frag_size",
       "-min_frag_duration",   "-movflags   +frag_keyframe"   and   "-movflags
       +frag_custom".  If  more	than one condition is specified, fragments are
       cut when	one of the specified conditions	is fulfilled. The exception to
       this is "-min_frag_duration", which has to be fulfilled for any of  the
       other conditions	to apply.

       Options

       frag_duration duration
	   Create fragments that are duration microseconds long.

       frag_size size
	   Create fragments that contain up to size bytes of payload data.

       min_frag_duration duration
	   Don't  create fragments that	are shorter than duration microseconds
	   long.

       movflags	flags
	   Set various muxing switches.	The following flags can	be used:

	   frag_keyframe
	       Start a new fragment at each video keyframe.

	   frag_custom
	       Allow the caller	to manually choose when	to cut	fragments,  by
	       calling	"av_write_frame(ctx,  NULL)"  to write a fragment with
	       the packets written so far. (This is  only  useful  with	 other
	       applications integrating	libavformat, not from ffmpeg.)

	   empty_moov
	       Write  an  initial moov atom directly at	the start of the file,
	       without describing any samples in it. Generally,	 an  mdat/moov
	       pair  is	 written at the	start of the file, as a	normal MOV/MP4
	       file, containing	only a short portion of	the  file.  With  this
	       option  set,  there  is no initial mdat atom, and the moov atom
	       only describes the tracks but has a zero	duration.

	       This  option  is	 implicitly  set  when	writing	 ismv  (Smooth
	       Streaming) files.

	   separate_moof
	       Write  a	 separate  moof	 (movie	fragment) atom for each	track.
	       Normally, packets for all tracks	are written  in	 a  moof  atom
	       (which  is  slightly more efficient), but with this option set,
	       the muxer writes	one moof/mdat pair for each track,  making  it
	       easier to separate tracks.

	       This  option  is	 implicitly  set  when	writing	 ismv  (Smooth
	       Streaming) files.

	   skip_sidx
	       Skip writing of sidx atom. When bitrate overhead	 due  to  sidx
	       atom  is	 high,	this option could be used for cases where sidx
	       atom is not mandatory.  When global_sidx	flag is	enabled,  this
	       option will be ignored.

	   faststart
	       Run a second pass moving	the index (moov	atom) to the beginning
	       of  the	file.	This  operation	can take a while, and will not
	       work in various situations such as fragmented output,  thus  it
	       is not enabled by default.

	   rtphint
	       Add RTP hinting tracks to the output file.

	   disable_chpl
	       Disable	Nero chapter markers (chpl atom).  Normally, both Nero
	       chapters	and a QuickTime	chapter	track are written to the file.
	       With this option	set, only the QuickTime	chapter	track will  be
	       written.	 Nero  chapters	 can  cause  failures when the file is
	       reprocessed with	certain	tagging	programs,  like	 mp3Tag	 2.61a
	       and  iTunes  11.3,  most	 likely	other versions are affected as
	       well.

	   omit_tfhd_offset
	       Do not write any	absolute base_data_offset in tfhd atoms.  This
	       avoids  tying  fragments	 to  absolute  byte  positions	in the
	       file/streams.

	   default_base_moof
	       Similarly to the	omit_tfhd_offset, this flag avoids writing the
	       absolute	base_data_offset field in tfhd atoms, but does	so  by
	       using  the  new default-base-is-moof flag instead. This flag is
	       new from	14496-12:2012. This may	make the fragments  easier  to
	       parse  in certain circumstances (avoiding basing	track fragment
	       location	calculations on	the implicit end of the	previous track
	       fragment).

	   negative_cts_offsets
	       Enables utilization of version 1	of the CTTS box, in which  the
	       CTS offsets can be negative. This enables the initial sample to
	       have  DTS/CTS  of zero, and reduces the need for	edit lists for
	       some cases such as video	tracks	with  B-frames.	 Additionally,
	       eases conformance with the DASH-IF interoperability guidelines.

	       This  option  is	 implicitly  set  when	writing	 ismv  (Smooth
	       Streaming) files.

       moov_size bytes
	   Reserves space for the moov atom  at	 the  beginning	 of  the  file
	   instead  of placing the moov	atom at	the end. If the	space reserved
	   is insufficient, muxing will	fail.

       write_tmcd
	   Specify "on"	to force writing a timecode track, "off" to disable it
	   and "auto" to write a timecode track	only for mov  and  mp4	output
	   (default).

       write_btrt bool
	   Force  or  disable  writing bitrate box inside stsd box of a	track.
	   The box contains decoding buffer size (in bytes),  maximum  bitrate
	   and	average	bitrate	for the	track. The box will be skipped if none
	   of these values can be computed.  Default is	"-1" or	"auto",	 which
	   will	write the box only in MP4 mode.

       write_prft
	   Write  producer  time  reference  box  (PRFT) with a	specified time
	   source for the NTP field in the PRFT	box. Set value as wallclock to
	   specify timesource as wallclock time	and pts	to specify  timesource
	   as input packets' PTS values.

	   Setting  value  to  pts  is applicable only for a live encoding use
	   case, where PTS values are set as as	wallclock time at the  source.
	   For	example,  an  encoding	use  case with decklink	capture	source
	   where video_pts and audio_pts are set to abs_wallclock.

       empty_hdlr_name bool
	   Enable to skip writing the name inside a "hdlr"  box.   Default  is
	   "false".

       movie_timescale scale
	   Set	the timescale written in the movie header box ("mvhd").	 Range
	   is 1	to INT_MAX. Default is 1000.

       video_track_timescale scale
	   Set the timescale used for video tracks. Range is 0 to INT_MAX.  If
	   set to 0, the timescale is automatically set	based  on  the	native
	   stream time base. Default is	0.

       Example

       Smooth  Streaming  content  can	be pushed in real time to a publishing
       point on	IIS with this muxer. Example:

	       ffmpeg -re <<normal input/transcoding options>> -movflags isml+frag_keyframe -f ismv http://server/publishingpoint.isml/Streams(Encoder1)

   mp3
       The MP3 muxer writes a raw  MP3	stream	with  the  following  optional
       features:

          An  ID3v2  metadata	header	at the beginning (enabled by default).
	   Versions 2.3	and 2.4	are  supported,	 the  "id3v2_version"  private
	   option controls which one is	used (3	or 4). Setting "id3v2_version"
	   to 0	disables the ID3v2 header completely.

	   The	muxer  supports	writing	attached pictures (APIC	frames)	to the
	   ID3v2 header.  The pictures are supplied to the muxer in form of  a
	   video stream	with a single packet. There can	be any number of those
	   streams,  each  will	correspond to a	single APIC frame.  The	stream
	   metadata tags title and comment map to APIC description and picture
	   type	 respectively.	 See   <http://id3.org/id3v2.4.0-frames>   for
	   allowed picture types.

	   Note	 that the APIC frames must be written at the beginning,	so the
	   muxer will buffer the audio frames until it gets all	the  pictures.
	   It is therefore advised to provide the pictures as soon as possible
	   to avoid excessive buffering.

          A  Xing/LAME	frame right after the ID3v2 header (if present). It is
	   enabled by default, but will	be  written  only  if  the  output  is
	   seekable.  The  "write_xing"	 private option	can be used to disable
	   it.	The frame contains various information that may	be  useful  to
	   the decoder,	like the audio duration	or encoder delay.

          A legacy ID3v1 tag at the end of the	file (disabled by default). It
	   may	be  enabled  with the "write_id3v1" private option, but	as its
	   capabilities	are very limited, its usage is not recommended.

       Examples:

       Write an	mp3 with an ID3v2.3 header and an ID3v1	footer:

	       ffmpeg -i INPUT -id3v2_version 3	-write_id3v1 1 out.mp3

       To attach a picture to an mp3  file  select  both  the  audio  and  the
       picture stream with "map":

	       ffmpeg -i input.mp3 -i cover.png	-c copy	-map 0 -map 1
	       -metadata:s:v title="Album cover" -metadata:s:v comment="Cover (Front)" out.mp3

       Write a "clean" MP3 without any extra features:

	       ffmpeg -i input.wav -write_xing 0 -id3v2_version	0 out.mp3

   mpegts
       MPEG transport stream muxer.

       This muxer implements ISO 13818-1 and part of ETSI EN 300 468.

       The recognized metadata settings	in mpegts muxer	are "service_provider"
       and   "service_name".   If   they   are	 not   set   the  default  for
       "service_provider" is FFmpeg and	 the  default  for  "service_name"  is
       Service01.

       Options

       The muxer options are:

       mpegts_transport_stream_id integer
	   Set	the transport_stream_id. This identifies a transponder in DVB.
	   Default is 0x0001.

       mpegts_original_network_id integer
	   Set the original_network_id.	This is	unique identifier of a network
	   in DVB. Its main use	is in the unique identification	of  a  service
	   through  the	path Original_Network_ID, Transport_Stream_ID. Default
	   is 0x0001.

       mpegts_service_id integer
	   Set the service_id, also  known  as	program	 in  DVB.  Default  is
	   0x0001.

       mpegts_service_type integer
	   Set the program service_type. Default is "digital_tv".  Accepts the
	   following options:

	   hex_value
	       Any  hexadecimal	value between 0x01 and 0xff as defined in ETSI
	       300 468.

	   digital_tv
	       Digital TV service.

	   digital_radio
	       Digital Radio service.

	   teletext
	       Teletext	service.

	   advanced_codec_digital_radio
	       Advanced	Codec Digital Radio service.

	   mpeg2_digital_hdtv
	       MPEG2 Digital HDTV service.

	   advanced_codec_digital_sdtv
	       Advanced	Codec Digital SDTV service.

	   advanced_codec_digital_hdtv
	       Advanced	Codec Digital HDTV service.

       mpegts_pmt_start_pid integer
	   Set the first PID for PMTs. Default is 0x1000, minimum  is  0x0020,
	   maximum is 0x1ffa. This option has no effect	in m2ts	mode where the
	   PMT PID is fixed 0x0100.

       mpegts_start_pid	integer
	   Set	the  first  PID	 for  elementary  streams.  Default is 0x0100,
	   minimum is 0x0020, maximum is 0x1ffa. This option has no effect  in
	   m2ts	mode where the elementary stream PIDs are fixed.

       mpegts_m2ts_mode	boolean
	   Enable  m2ts	mode if	set to 1. Default value	is "-1"	which disables
	   m2ts	mode.

       muxrate integer
	   Set a constant muxrate. Default is VBR.

       pes_payload_size	integer
	   Set minimum PES packet payload in bytes. Default is 2930.

       mpegts_flags flags
	   Set mpegts flags. Accepts the following options:

	   resend_headers
	       Reemit PAT/PMT before writing the next packet.

	   latm
	       Use LATM	packetization for AAC.

	   pat_pmt_at_frames
	       Reemit PAT and PMT at each video	frame.

	   system_b
	       Conform to System B (DVB) instead of System A (ATSC).

	   initial_discontinuity
	       Mark the	initial	packet of each stream as discontinuity.

	   nit Emit NIT	table.

	   omit_rai
	       Disable writing of random access	indicator.

       mpegts_copyts boolean
	   Preserve original timestamps, if value is set to 1.	Default	 value
	   is  "-1",  which  results in	shifting timestamps so that they start
	   from	0.

       omit_video_pes_length boolean
	   Omit	the PES	packet length for video	packets. Default is 1 (true).

       pcr_period integer
	   Override the	 default  PCR  retransmission  time  in	 milliseconds.
	   Default  is	"-1"  which  means  that  the  PCR  interval  will  be
	   determined automatically: 20	 ms  is	 used  for  CBR	 streams,  the
	   highest multiple of the frame duration which	is less	than 100 ms is
	   used	for VBR	streams.

       pat_period duration
	   Maximum time	in seconds between PAT/PMT tables. Default is 0.1.

       sdt_period duration
	   Maximum time	in seconds between SDT tables. Default is 0.5.

       nit_period duration
	   Maximum time	in seconds between NIT tables. Default is 0.5.

       tables_version integer
	   Set PAT, PMT, SDT and NIT version (default 0, valid values are from
	   0   to  31,	inclusively).	This  option  allows  updating	stream
	   structure so	that standard consumer may detect the  change.	To  do
	   so,	reopen	output	"AVFormatContext"  (in	case  of API usage) or
	   restart ffmpeg instance, cyclically changing	tables_version value:

		   ffmpeg -i source1.ts	-codec copy -f mpegts -tables_version 0	udp://1.1.1.1:1111
		   ffmpeg -i source2.ts	-codec copy -f mpegts -tables_version 1	udp://1.1.1.1:1111
		   ...
		   ffmpeg -i source3.ts	-codec copy -f mpegts -tables_version 31 udp://1.1.1.1:1111
		   ffmpeg -i source1.ts	-codec copy -f mpegts -tables_version 0	udp://1.1.1.1:1111
		   ffmpeg -i source2.ts	-codec copy -f mpegts -tables_version 1	udp://1.1.1.1:1111
		   ...

       Example

	       ffmpeg -i file.mpg -c copy \
		    -mpegts_original_network_id	0x1122 \
		    -mpegts_transport_stream_id	0x3344 \
		    -mpegts_service_id 0x5566 \
		    -mpegts_pmt_start_pid 0x1500 \
		    -mpegts_start_pid 0x150 \
		    -metadata service_provider="Some provider" \
		    -metadata service_name="Some Channel" \
		    out.ts

   mxf,	mxf_d10, mxf_opatom
       MXF muxer.

       Options

       The muxer options are:

       store_user_comments bool
	   Set if user comments	should be stored if available or  never.   IRT
	   D-10	 does  not  allow  user	comments. The default is thus to write
	   them	for mxf	and mxf_opatom but not for mxf_d10

   null
       Null muxer.

       This muxer does not generate any	output file, it	is mainly  useful  for
       testing or benchmarking purposes.

       For example to benchmark	decoding with ffmpeg you can use the command:

	       ffmpeg -benchmark -i INPUT -f null out.null

       Note  that  the above command does not read or write the	out.null file,
       but specifying the output file is required by the ffmpeg	syntax.

       Alternatively you can write the command as:

	       ffmpeg -benchmark -i INPUT -f null -

   nut
       -syncpoints flags
	   Change the syncpoint	usage in nut:

	   default use the normal low-overhead seeking aids.
	   none	do not use the syncpoints at all, reducing the overhead	but
	   making the stream non-seekable;
		   Use of this option is not recommended, as the resulting files are very damage
		   sensitive and seeking is not	possible. Also in general the overhead from
		   syncpoints is negligible. Note, -C<write_index> 0 can be used to disable
		   all growing data tables, allowing to	mux endless streams with limited memory
		   and without these disadvantages.

	   timestamped extend the syncpoint with a wallclock field.

	   The none and	timestamped flags are experimental.

       -write_index bool
	   Write index at the end, the default is to write an index.

	       ffmpeg -i INPUT -f_strict experimental -syncpoints none - | processor

   ogg
       Ogg container muxer.

       -page_duration duration
	   Preferred page duration, in microseconds. The muxer will attempt to
	   create pages	that are  approximately	 duration  microseconds	 long.
	   This	 allows	 the  user  to compromise between seek granularity and
	   container overhead. The default is 1	second.	A value	of 0 will fill
	   all segments, making	pages as large as possible. A value of 1  will
	   effectively	use  1	packet-per-page	 in  most situations, giving a
	   small  seek	granularity  at	 the  cost  of	additional   container
	   overhead.

       -serial_offset value
	   Serial  value from which to set the streams serial number.  Setting
	   it to different and sufficiently  large  values  ensures  that  the
	   produced ogg	files can be safely chained.

   raw muxers
       Raw  muxers  accept a single stream matching the	designated codec. They
       do not store timestamps or metadata.  The recognized extension  is  the
       same as the muxer name unless indicated otherwise.

       ac3

       Dolby Digital, also known as AC-3, audio.

       adx

       CRI Middleware ADX audio.

       This  muxer will	write out the total sample count near the start	of the
       first packet when the output is seekable	and the	count can be stored in
       32 bits.

       aptx

       aptX (Audio Processing Technology for Bluetooth)	audio.

       aptx_hd

       aptX HD (Audio Processing Technology for	Bluetooth) audio.

       Extensions: aptxhd

       avs2

       AVS2-P2/IEEE1857.4 video.

       Extensions: avs,	avs2

       cavsvideo

       Chinese AVS (Audio Video	Standard) video.

       Extensions: cavs

       codec2raw

       Codec 2 audio.

       No extension is registered so format name has to	be supplied e.g.  with
       the ffmpeg CLI tool "-f codec2raw".

       data

       Data  muxer  accepts  a	single stream with any codec of	any type.  The
       input stream has	to be selected using the "-map"	option with the	ffmpeg
       CLI tool.

       No extension is registered so format name has to	be supplied e.g.  with
       the ffmpeg CLI tool "-f data".

       dirac

       BBC Dirac video.	The Dirac Pro codec is a subset	and is standardized as
       SMPTE VC-2.

       Extensions: drc,	vc2

       dnxhd

       Avid  DNxHD  video.  It	is  standardized  as SMPTE VC-3. Accepts DNxHR
       streams.

       Extensions: dnxhd, dnxhr

       dts

       DTS Coherent Acoustics (DCA) audio.

       eac3

       Dolby Digital Plus, also	known as Enhanced AC-3,	audio.

       evc

       MPEG-5 Essential	Video Coding (EVC) / EVC / MPEG-5 Part 1 EVC video.

       Extensions: evc

       g722

       ITU-T G.722 audio.

       g723_1

       ITU-T G.723.1 audio.

       Extensions: tco,	rco

       g726

       ITU-T G.726 big-endian ("left-justified") audio.

       No extension is registered so format name has to	be supplied e.g.  with
       the ffmpeg CLI tool "-f g726".

       g726le

       ITU-T G.726 little-endian ("right-justified") audio.

       No  extension is	registered so format name has to be supplied e.g. with
       the ffmpeg CLI tool "-f g726le".

       gsm

       Global System for Mobile	Communications audio.

       h261

       ITU-T H.261 video.

       h263

       ITU-T H.263 / H.263-1996, H.263+	/ H.263-1998 / H.263 version 2 video.

       h264

       ITU-T H.264 / MPEG-4 Part 10 AVC	video. Bitstream shall be converted to
       Annex B syntax if it's in length-prefixed mode.

       Extensions: h264, 264

       hevc

       ITU-T H.265 / MPEG-H Part 2 HEVC	video. Bitstream shall be converted to
       Annex B syntax if it's in length-prefixed mode.

       Extensions: hevc, h265, 265

       m4v

       MPEG-4 Part 2 video.

       mjpeg

       Motion JPEG video.

       Extensions: mjpg, mjpeg

       mlp

       Meridian	Lossless Packing, also known as	Packed PCM, audio.

       mp2

       MPEG-1 Audio Layer II audio.

       Extensions: mp2,	m2a, mpa

       mpeg1video

       MPEG-1 Part 2 video.

       Extensions: mpg,	mpeg, m1v

       mpeg2video

       ITU-T H.262 / MPEG-2 Part 2 video.

       Extensions: m2v

       obu

       AV1 low overhead	Open Bitstream Units muxer.  Temporal  delimiter  OBUs
       will be inserted	in all temporal	units of the stream.

       rawvideo

       Raw uncompressed	video.

       Extensions: yuv,	rgb

       sbc

       Bluetooth SIG low-complexity subband codec audio.

       Extensions: sbc,	msbc

       truehd

       Dolby TrueHD audio.

       Extensions: thd

       vc1

       SMPTE 421M / VC-1 video.

   segment, stream_segment, ssegment
       Basic stream segmenter.

       This  muxer  outputs  streams  to  a number of separate files of	nearly
       fixed duration. Output filename pattern can be set in a fashion similar
       to image2, or by	using a	"strftime" template if the strftime option  is
       enabled.

       "stream_segment"	 is  a variant of the muxer used to write to streaming
       output formats, i.e. which  do  not  require  global  headers,  and  is
       recommended  for	 outputting  e.g.  to  MPEG transport stream segments.
       "ssegment" is a shorter alias for "stream_segment".

       Every segment starts with a keyframe of the selected reference  stream,
       which is	set through the	reference_stream option.

       Note  that if you want accurate splitting for a video file, you need to
       make the	input key frames  correspond  to  the  exact  splitting	 times
       expected	 by  the  segmenter,  or  the segment muxer will start the new
       segment with the	key frame found	next after the specified start time.

       The segment muxer works best with a single constant frame rate video.

       Optionally it can generate a list of the	created	segments,  by  setting
       the   option   segment_list.   The   list  type	is  specified  by  the
       segment_list_type option. The entry filenames in	the segment  list  are
       set by default to the basename of the corresponding segment files.

       See  also  the hls muxer, which provides	a more specific	implementation
       for HLS segmentation.

       Options

       The segment muxer supports the following	options:

       increment_tc 1|0
	   if set to 1,	increment timecode between each	 segment  If  this  is
	   selected,  the  input  need	to  have a timecode in the first video
	   stream. Default value is 0.

       reference_stream	specifier
	   Set the reference stream, as	specified by the string	specifier.  If
	   specifier is	set to "auto", the reference is	chosen	automatically.
	   Otherwise   it  must	 be  a	stream	specifier  (see	 the  ``Stream
	   specifiers''	chapter	in the	ffmpeg	manual)	 which	specifies  the
	   reference stream. The default value is "auto".

       segment_format format
	   Override  the  inner	 container format, by default it is guessed by
	   the filename	extension.

       segment_format_options options_list
	   Set output format options using a  :-separated  list	 of  key=value
	   parameters.	Values	containing  the	 ":" special character must be
	   escaped.

       segment_list name
	   Generate also a listfile named name.	If not specified  no  listfile
	   is generated.

       segment_list_flags flags
	   Set flags affecting the segment list	generation.

	   It currently	supports the following flags:

	   cache
	       Allow caching (only affects M3U8	list files).

	   live
	       Allow live-friendly file	generation.

       segment_list_size size
	   Update  the list file so that it contains at	most size segments. If
	   0 the list file will	contain	all the	segments. Default value	is 0.

       segment_list_entry_prefix prefix
	   Prepend prefix to each entry. Useful	to  generate  absolute	paths.
	   By default no prefix	is applied.

       segment_list_type type
	   Select the listing format.

	   The following values	are recognized:

	   flat
	       Generate	 a flat	list for the created segments, one segment per
	       line.

	   csv,	ext
	       Generate	a list for the created segments, one segment per line,
	       each line matching the format (comma-separated values):

		       <segment_filename>,<segment_start_time>,<segment_end_time>

	       segment_filename	is the name of the output  file	 generated  by
	       the  muxer  according  to  the  provided	 pattern. CSV escaping
	       (according to RFC4180) is applied if required.

	       segment_start_time and  segment_end_time	 specify  the  segment
	       start and end time expressed in seconds.

	       A  list	file with the suffix ".csv" or ".ext" will auto-select
	       this format.

	       ext is deprecated in favor or csv.

	   ffconcat
	       Generate	 an  ffconcat  file  for  the  created	segments.  The
	       resulting file can be read using	the FFmpeg concat demuxer.

	       A  list file with the suffix ".ffcat" or	".ffconcat" will auto-
	       select this format.

	   m3u8
	       Generate	an extended  M3U8  file,  version  3,  compliant  with
	       <http://tools.ietf.org/id/draft-pantos-http-live-streaming>.

	       A  list	file  with  the	 suffix	 ".m3u8" will auto-select this
	       format.

	   If not specified the	type  is  guessed  from	 the  list  file  name
	   suffix.

       segment_time time
	   Set	segment	 duration  to  time,  the  value  must	be  a duration
	   specification. Default value	is "2".	 See  also  the	 segment_times
	   option.

	   Note	 that  splitting  may  not  be	accurate, unless you force the
	   reference stream key-frames at the given time. See the introductory
	   notice and the examples below.

       min_seg_duration	time
	   Set minimum segment duration	to time, the value must	be a  duration
	   specification.  This	 prevents  the	muxer  ending  segments	 at  a
	   duration below this	value.	Only  effective	 with  "segment_time".
	   Default value is "0".

       segment_atclocktime 1|0
	   If  set  to "1" split at regular clock time intervals starting from
	   00:00 o'clock. The time value specified in segment_time is used for
	   setting the length of the splitting interval.

	   For example with segment_time set to	"900" this makes  it  possible
	   to create files at 12:00 o'clock, 12:15, 12:30, etc.

	   Default value is "0".

       segment_clocktime_offset	duration
	   Delay  the segment splitting	times with the specified duration when
	   using segment_atclocktime.

	   For	  example    with    segment_time    set    to	  "900"	   and
	   segment_clocktime_offset  set  to  "300"  this makes	it possible to
	   create files	at 12:05, 12:20, 12:35,	etc.

	   Default value is "0".

       segment_clocktime_wrap_duration duration
	   Force the segmenter to only start a new segment if a	packet reaches
	   the muxer within the	specified duration after the segmenting	 clock
	   time.  This	way  you  can  make  the  segmenter  more resilient to
	   backward local time jumps, such as leap seconds  or	transition  to
	   standard time from daylight savings time.

	   Default is the maximum possible duration which means	starting a new
	   segment regardless of the elapsed time since	the last clock time.

       segment_time_delta delta
	   Specify  the	 accuracy  time	 when  selecting  the start time for a
	   segment, expressed as a duration specification.  Default  value  is
	   "0".

	   When	delta is specified a key-frame will start a new	segment	if its
	   PTS satisfies the relation:

		   PTS >= start_time - time_delta

	   This	option is useful when splitting	video content, which is	always
	   split  at  GOP boundaries, in case a	key frame is found just	before
	   the specified split time.

	   In particular may be	used in	combination  with  the	ffmpeg	option
	   force_key_frames. The key frame times specified by force_key_frames
	   may	not  be	 set  accurately  because of rounding issues, with the
	   consequence that a key frame	time may result	set  just  before  the
	   specified   time.  For  constant  frame  rate  videos  a  value  of
	   1/(2*frame_rate) should address the worst case mismatch between the
	   specified time and the time set by force_key_frames.

       segment_times times
	   Specify a list of split points. times  contains  a  list  of	 comma
	   separated  duration	specifications,	 in increasing order. See also
	   the segment_time option.

       segment_frames frames
	   Specify a list of split video frame numbers.	frames contains	a list
	   of comma separated integer numbers, in increasing order.

	   This	option specifies to start a new	segment	whenever  a  reference
	   stream  key frame is	found and the sequential number	(starting from
	   0) of the frame is greater or equal to the next value in the	list.

       segment_wrap limit
	   Wrap	around segment index once it reaches limit.

       segment_start_number number
	   Set the sequence number of the first	segment. Defaults to 0.

       strftime	1|0
	   Use the "strftime" function to define the name of the new  segments
	   to write. If	this is	selected, the output segment name must contain
	   a "strftime"	function template. Default value is 0.

       break_non_keyframes 1|0
	   If enabled, allow segments to start on frames other than keyframes.
	   This	 improves  behavior  on	 some  players	when  the time between
	   keyframes is	inconsistent, but may make things worse	on others, and
	   can cause some oddities during seeking. Defaults to 0.

       reset_timestamps	1|0
	   Reset timestamps at the beginning of	each  segment,	so  that  each
	   segment  will  start	with near-zero timestamps. It is meant to ease
	   the playback	of the generated segments.  May	 not  work  with  some
	   combinations	of muxers/codecs. It is	set to 0 by default.

       initial_offset offset
	   Specify  timestamp offset to	apply to the output packet timestamps.
	   The argument	must be	a time duration	specification, and defaults to
	   0.

       write_empty_segments 1|0
	   If enabled, write an	empty segment if there are no  packets	during
	   the	period	a  segment  would usually span.	Otherwise, the segment
	   will	be filled with the next	packet written.	Defaults to 0.

       Make sure to require a closed GOP when encoding and to set the GOP size
       to fit your segment time	constraint.

       Examples

          Remux the content of	file in.mkv to a list of segments out-000.nut,
	   out-001.nut,	etc., and write	the  list  of  generated  segments  to
	   out.list:

		   ffmpeg -i in.mkv -codec hevc	-flags +cgop -g	60 -map	0 -f segment -segment_list out.list out%03d.nut

          Segment  input  and	set  output  format  options  for  the	output
	   segments:

		   ffmpeg -i in.mkv -f segment -segment_time 10	-segment_format_options	movflags=+faststart out%03d.mp4

          Segment the input file according to the split points	 specified  by
	   the segment_times option:

		   ffmpeg -i in.mkv -codec copy	-map 0 -f segment -segment_list	out.csv	-segment_times 1,2,3,5,8,13,21 out%03d.nut

          Use	the  ffmpeg force_key_frames option to force key frames	in the
	   input at the	specified location, together with the  segment	option
	   segment_time_delta  to account for possible roundings operated when
	   setting key frame times.

		   ffmpeg -i in.mkv -force_key_frames 1,2,3,5,8,13,21 -codec:v mpeg4 -codec:a pcm_s16le	-map 0 \
		   -f segment -segment_list out.csv -segment_times 1,2,3,5,8,13,21 -segment_time_delta 0.05 out%03d.nut

	   In order to force key frames	on  the	 input	file,  transcoding  is
	   required.

          Segment the input file by splitting the input file according	to the
	   frame numbers sequence specified with the segment_frames option:

		   ffmpeg -i in.mkv -codec copy	-map 0 -f segment -segment_list	out.csv	-segment_frames	100,200,300,500,800 out%03d.nut

          Convert  the	 in.mkv	 to  TS	segments using the "libx264" and "aac"
	   encoders:

		   ffmpeg -i in.mkv -map 0 -codec:v libx264 -codec:a aac -f ssegment -segment_list out.list out%03d.ts

          Segment the input file, and create an M3U8 live  playlist  (can  be
	   used	as live	HLS source):

		   ffmpeg -re -i in.mkv	-codec copy -map 0 -f segment -segment_list playlist.m3u8 \
		   -segment_list_flags +live -segment_time 10 out%03d.mkv

   smoothstreaming
       Smooth  Streaming  muxer	 generates  a  set of files (Manifest, chunks)
       suitable	for serving with conventional web server.

       window_size
	   Specify the number of fragments kept	in  the	 manifest.  Default  0
	   (keep all).

       extra_window_size
	   Specify the number of fragments kept	outside	of the manifest	before
	   removing from disk. Default 5.

       lookahead_count
	   Specify the number of lookahead fragments. Default 2.

       min_frag_duration
	   Specify  the	 minimum  fragment duration (in	microseconds). Default
	   5000000.

       remove_at_exit
	   Specify whether to remove all fragments when	 finished.  Default  0
	   (do not remove).

   streamhash
       Per stream hash testing format.

       This  muxer  computes  and prints a cryptographic hash of all the input
       frames, on a per-stream basis. This can be  used	 for  equality	checks
       without having to do a complete binary comparison.

       By  default  audio  frames are converted	to signed 16-bit raw audio and
       video frames to raw video before	computing the hash, but	the output  of
       explicit	 conversions  to other codecs can also be used.	Timestamps are
       ignored.	It uses	the SHA-256 cryptographic hash	function  by  default,
       but supports several other algorithms.

       The  output  of	the muxer consists of one line per stream of the form:
       streamindex,streamtype,algo=hash, where streamindex is the index	of the
       mapped stream, streamtype is a single character indicating the type  of
       stream, algo is a short string representing the hash function used, and
       hash is a hexadecimal number representing the computed hash.

       hash algorithm
	   Use	the  cryptographic  hash  function  specified  by  the	string
	   algorithm.  Supported values	include	"MD5", "murmur3", "RIPEMD128",
	   "RIPEMD160",	"RIPEMD256", "RIPEMD320", "SHA160", "SHA224", "SHA256"
	   (default), "SHA512/224", "SHA512/256", "SHA384", "SHA512",  "CRC32"
	   and "adler32".

       Examples

       To  compute  the	 SHA-256  hash of the input converted to raw audio and
       video, and store	it in the file out.sha256:

	       ffmpeg -i INPUT -f streamhash out.sha256

       To print	an MD5 hash to stdout use the command:

	       ffmpeg -i INPUT -f streamhash -hash md5 -

       See also	the hash and framehash muxers.

   tee
       The tee muxer can be used to write the same data	 to  several  outputs,
       such  as	 files	or  streams.  It can be	used, for example, to stream a
       video over a network and	save it	to disk	at the same time.

       It is different from specifying several outputs to the ffmpeg  command-
       line tool. With the tee muxer, the audio	and video data will be encoded
       only  once.   With  conventional	 multiple  outputs,  multiple encoding
       operations in parallel are initiated, which can	be  a  very  expensive
       process.	 The  tee  muxer  is not useful	when using the libavformat API
       directly	because	it is then  possible  to  feed	the  same  packets  to
       several muxers directly.

       Since  the  tee	muxer does not represent any particular	output format,
       ffmpeg cannot auto-select output	streams. So all	streams	 intended  for
       output must be specified	using "-map". See the examples below.

       Some  encoders  may  need  different  options  depending	 on the	output
       format; the auto-detection of this can not work with the	tee muxer,  so
       they  need  to  be  explicitly  specified.   The	 main  example	is the
       global_header flag.

       The slave outputs are specified in the file name	given  to  the	muxer,
       separated  by '|'. If any of the	slave name contains the	'|' separator,
       leading or trailing spaces or any  special  character,  those  must  be
       escaped	(see the "Quoting and escaping"	section	in the ffmpeg-utils(1)
       manual).

       Options

       use_fifo	bool
	   If set to 1,	slave outputs will be processed	 in  separate  threads
	   using  the  fifo  muxer.  This  allows  to compensate for different
	   speed/latency/reliability  of   outputs   and   setup   transparent
	   recovery. By	default	this feature is	turned off.

       fifo_options
	   Options to pass to fifo pseudo-muxer	instances. See fifo.

       Muxer  options  can be specified	for each slave by prepending them as a
       list of key=value pairs separated by ':', between square	 brackets.  If
       the  options  values  contain a special character or the	':' separator,
       they must be escaped; note that this is a second	level escaping.

       The following special options are also recognized:

       f   Specify the format name. Required if	it cannot be guessed from  the
	   output URL.

       bsfs[/spec]
	   Specify  a  list  of	 bitstream  filters  to	apply to the specified
	   output.

	   It is possible to specify to	which streams a	given bitstream	filter
	   applies, by appending a stream specifier to the option separated by
	   "/".	 spec  must  be	 a  stream  specifier	(see   Format	stream
	   specifiers).

	   If  the  stream  specifier  is not specified, the bitstream filters
	   will	be applied to all streams in the output. This will cause  that
	   output  operation  to  fail if the output contains streams to which
	   the bitstream filter	 cannot	 be  applied  e.g.  "h264_mp4toannexb"
	   being applied to an output containing an audio stream.

	   Options  for	 a  bitstream  filter must be specified	in the form of
	   "opt=value".

	   Several bitstream filters can be specified, separated by ",".

       use_fifo	bool
	   This	allows to override tee muxer use_fifo  option  for  individual
	   slave muxer.

       fifo_options
	   This	allows to override tee muxer fifo_options for individual slave
	   muxer.  See fifo.

       select
	   Select  the	streams	 that  should  be  mapped to the slave output,
	   specified by	a stream specifier. If not specified, this defaults to
	   all the mapped streams. This	will cause that	 output	 operation  to
	   fail	if the output format does not accept all mapped	streams.

	   You	may  use  multiple stream specifiers separated by commas (",")
	   e.g.: "a:0,v"

       onfail
	   Specify behaviour on	output failure.	This  can  be  set  to	either
	   "abort"  (which  is	default) or "ignore". "abort" will cause whole
	   process to fail in case of failure on this slave  output.  "ignore"
	   will	 ignore	failure	on this	output,	so other outputs will continue
	   without being affected.

       Examples

          Encode something and	both archive it	in a WebM file and  stream  it
	   as MPEG-TS over UDP:

		   ffmpeg -i ... -c:v libx264 -c:a mp2 -f tee -map 0:v -map 0:a
		     "archive-20121107.mkv|[f=mpegts]udp://10.0.1.255:1234/"

          As above, but continue streaming even if output to local file fails
	   (for	example	local drive fills up):

		   ffmpeg -i ... -c:v libx264 -c:a mp2 -f tee -map 0:v -map 0:a
		     "[onfail=ignore]archive-20121107.mkv|[f=mpegts]udp://10.0.1.255:1234/"

          Use	ffmpeg	to  encode  the	 input,	 and  send the output to three
	   different destinations. The "dump_extra" bitstream filter  is  used
	   to  add  extradata  information  to	all the	output video keyframes
	   packets, as requested by the	MPEG-TS	format.	The select  option  is
	   applied to out.aac in order to make it contain only audio packets.

		   ffmpeg -i ... -map 0	-flags +global_header -c:v libx264 -c:a	aac
			  -f tee "[bsfs/v=dump_extra=freq=keyframe]out.ts|[movflags=+faststart]out.mp4|[select=a]out.aac"

          As  above,  but select only stream "a:1" for	the audio output. Note
	   that	a second level escaping	must be	performed, as ":" is a special
	   character used to separate options.

		   ffmpeg -i ... -map 0	-flags +global_header -c:v libx264 -c:a	aac
			  -f tee "[bsfs/v=dump_extra=freq=keyframe]out.ts|[movflags=+faststart]out.mp4|[select=\'a:1\']out.aac"

   webm_chunk
       WebM Live Chunk Muxer.

       This muxer writes out WebM headers and chunks as	separate  files	 which
       can be consumed by clients that support WebM Live streams via DASH.

       Options

       This muxer supports the following options:

       chunk_start_index
	   Index of the	first chunk (defaults to 0).

       header
	   Filename  of	 the  header  where  the  initialization  data will be
	   written.

       audio_chunk_duration
	   Duration of each audio chunk	in milliseconds	(defaults to 5000).

       Example

	       ffmpeg -f v4l2 -i /dev/video0 \
		      -f alsa -i hw:0 \
		      -map 0:0 \
		      -c:v libvpx-vp9 \
		      -s 640x360 -keyint_min 30	-g 30 \
		      -f webm_chunk \
		      -header webm_live_video_360.hdr \
		      -chunk_start_index 1 \
		      webm_live_video_360_%d.chk \
		      -map 1:0 \
		      -c:a libvorbis \
		      -b:a 128k	\
		      -f webm_chunk \
		      -header webm_live_audio_128.hdr \
		      -chunk_start_index 1 \
		      -audio_chunk_duration 1000 \
		      webm_live_audio_128_%d.chk

   webm_dash_manifest
       WebM DASH Manifest muxer.

       This muxer implements the WebM DASH Manifest specification to  generate
       the  DASH  manifest  XML. It also supports manifest generation for DASH
       live streams.

       For more	information see:

          WebM			     DASH			Specification:
	   <https://sites.google.com/a/webmproject.org/wiki/adaptive-streaming/webm-dash-specification>

          ISO			     DASH			Specification:
	   <http://standards.iso.org/ittf/PubliclyAvailableStandards/c065274_ISO_IEC_23009-1_2014.zip>

       Options

       This muxer supports the following options:

       adaptation_sets
	   This	 option	 has   the   following	 syntax:   "id=x,streams=a,b,c
	   id=y,streams=d,e"  where  x and y are the unique identifiers	of the
	   adaptation  sets  and  a,b,c,d  and	e  are	the  indices  of   the
	   corresponding  audio	 and  video  streams. Any number of adaptation
	   sets	can be added using this	option.

       live
	   Set this to 1 to create a live stream DASH Manifest.	Default: 0.

       chunk_start_index
	   Start index of the first chunk. This	will  go  in  the  startNumber
	   attribute  of the SegmentTemplate element in	the manifest. Default:
	   0.

       chunk_duration_ms
	   Duration of each  chunk  in	milliseconds.  This  will  go  in  the
	   duration  attribute of the SegmentTemplate element in the manifest.
	   Default: 1000.

       utc_timing_url
	   URL of the page that	will return the	UTC timestamp in  ISO  format.
	   This	will go	in the value attribute of the UTCTiming	element	in the
	   manifest.  Default: None.

       time_shift_buffer_depth
	   Smallest   time   (in   seconds)  shifting  buffer  for  which  any
	   Representation is guaranteed	to be available. This will go  in  the
	   timeShiftBufferDepth	attribute of the MPD element. Default: 60.

       minimum_update_period
	   Minimum update period (in seconds) of the manifest. This will go in
	   the minimumUpdatePeriod attribute of	the MPD	element. Default: 0.

       Example

	       ffmpeg -f webm_dash_manifest -i video1.webm \
		      -f webm_dash_manifest -i video2.webm \
		      -f webm_dash_manifest -i audio1.webm \
		      -f webm_dash_manifest -i audio2.webm \
		      -map 0 -map 1 -map 2 -map	3 \
		      -c copy \
		      -f webm_dash_manifest \
		      -adaptation_sets "id=0,streams=0,1 id=1,streams=2,3" \
		      manifest.xml

METADATA
       FFmpeg  is  able	 to  dump  metadata  from  media  files	 into a	simple
       UTF-8-encoded INI-like text file	 and  then  load  it  back  using  the
       metadata	muxer/demuxer.

       The file	format is as follows:

       1.  A  file  consists of	a header and a number of metadata tags divided
	   into	sections, each on its own line.

       2.  The header is a ;FFMETADATA string, followed	by  a  version	number
	   (now	1).

       3.  Metadata tags are of	the form key=value

       4.  Immediately after header follows global metadata

       5.  After    global    metadata	  there	   may	  be   sections	  with
	   per-stream/per-chapter metadata.

       6.  A section starts with the section name in uppercase (i.e. STREAM or
	   CHAPTER) in brackets	([, ]) and ends	with next section  or  end  of
	   file.

       7.  At  the  beginning  of  a  chapter section there may	be an optional
	   timebase to be used for  start/end  values.	It  must  be  in  form
	   TIMEBASE=num/den,  where  num and den are integers. If the timebase
	   is missing then start/end times are assumed to be in	nanoseconds.

	   Next	a chapter section must contain chapter start and end times  in
	   form	START=num, END=num, where num is a positive integer.

       8.  Empty lines and lines starting with ; or # are ignored.

       9.  Metadata  keys  or values containing	special	characters (=, ;, #, \
	   and a newline) must be escaped with a backslash \.

       10. Note	that whitespace	in metadata (e.g. foo =	bar) is	considered  to
	   be a	part of	the tag	(in the	example	above key is foo , value is
	    bar).

       A ffmetadata file might look like this:

	       ;FFMETADATA1
	       title=bike\\shed
	       ;this is	a comment
	       artist=FFmpeg troll team

	       [CHAPTER]
	       TIMEBASE=1/1000
	       START=0
	       #chapter	ends at	0:01:00
	       END=60000
	       title=chapter \#1
	       [STREAM]
	       title=multi\
	       line

       By  using  the  ffmetadata  muxer and demuxer it	is possible to extract
       metadata	from an	input file to an ffmetadata file, and  then  transcode
       the file	into an	output file with the edited ffmetadata file.

       Extracting an ffmetadata	file with ffmpeg goes as follows:

	       ffmpeg -i INPUT -f ffmetadata FFMETADATAFILE

       Reinserting  edited  metadata  information from the FFMETADATAFILE file
       can be done as:

	       ffmpeg -i INPUT -i FFMETADATAFILE -map_metadata 1 -codec	copy OUTPUT

SEE ALSO
       ffmpeg(1), ffplay(1), ffprobe(1), libavformat(3)

AUTHORS
       The FFmpeg developers.

       For details about the authorship, see the Git history  of  the  project
       (https://git.ffmpeg.org/ffmpeg),	 e.g. by typing	the command git	log in
       the FFmpeg source directory,  or	 browsing  the	online	repository  at
       <https://git.ffmpeg.org/ffmpeg>.

       Maintainers  for	 the  specific	components  are	 listed	 in  the  file
       MAINTAINERS in the source code tree.

							     FFMPEG-FORMATS(1)

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