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opusenc(1) opus-tools opusenc(1) NAME opusenc - encode audio into the Opus format SYNOPSIS opusenc [ -h ] [ -V ] [ --help-picture ] [ --quiet ] [ --bitrate kbit/s ] [ --vbr ] [ --cvbr ] [ --hard-cbr ] [ --music ] [ --speech ] [ --comp complexity ] [ --framesize 2.5, 5, 10, 20, 40, 60 ] [ --expect-loss pct ] [ --downmix-mono ] [ --downmix-stereo ] [ --no-phase-inv ] [ --max- delay ms ] [ --title 'track title' ] [ --artist author ] [ --album 'al- bum title' ] [ --tracknumber 'track number' ] [ --genre genre ] [ --date YYYY-MM-DD ] [ --comment tag=value ] [ --picture filename|speci- fication ] [ --padding n ] [ --discard-comments ] [ --discard-pictures ] [ --raw ] [ --raw-bits bits/sample ] [ --raw-rate Hz ] [ --raw-chan N ] [ --raw-endianness flag ] [ --ignorelength ] [ --serial serial number ] [ --save-range file ] [ --set-ctl-int ctl=value ] input.wav out- put.opus DESCRIPTION opusenc reads audio data in Wave, AIFF, FLAC, Ogg/FLAC, or raw PCM for- mat and encodes it into an Ogg Opus stream. If the input file is "-" audio data is read from stdin. Likewise, if the output file is "-" the Ogg Opus stream is written to stdout. Unless quieted opusenc displays fancy statistics about the encoding progress. OPTIONS General options -h, --help Show command help -V, --version Show the version number --help-picture Show help on attaching album art --quiet Enable quiet mode. No messages are displayed. Encoding options --bitrate N.nnn Set target bitrate in kbit/s (6-256 per channel) In VBR mode this specifies the average rate for a large and di- verse collection of audio. In CVBR and Hard-CBR mode it speci- fies the specific output bitrate. The default for input with a sample rate of 44.1 kHz or higher is 64 kbit/s per mono stream and 96 kbit/s per coupled pair. --vbr Use variable bitrate encoding (default) In VBR mode the bitrate may go up and down freely depending on the content to achieve more consistent quality. --cvbr Use constrained variable bitrate encoding. Outputs to a specific bitrate. This mode is analogous to CBR in AAC/MP3 encoders and managed mode in Vorbis coders. This deliv- ers less consistent quality than VBR mode but consistent bi- trate. --hard-cbr Use hard constant bitrate encoding. With hard-cbr every frame will be exactly the same size, similar to how speech codecs work. This delivers lower overall quality but is useful where bitrate changes might leak data in encrypted channels or on synchronous transports. --music Override automatic detection and tune low bitrate encoding for music. By default, music is detected automatically and the classification may vary over time. Tuning impacts lower bitrates that involve tradeoffs between speech clarity and musical accuracy, and has no impact at bi- trates typically used for high quality music encoding. --speech Override automatic detection and tune low bitrate encoding for speech. By default, speech is detected automatically and the classification may vary over time. Tuning impacts lower bitrates that involve tradeoffs between speech clarity and musical accuracy, and has no impact at bi- trates typically used for high quality music encoding. --comp N Set encoding computational complexity (0-10, default: 10). Zero gives the fastest encodes but lower quality, while 10 gives the highest quality but slower encoding. --framesize N Set maximum frame size in milliseconds (2.5, 5, 10, 20, 40, 60, default: 20) Smaller framesizes achieve lower latency but less quality at a given bitrate. Sizes greater than 20ms are only interesting at fairly low bi- trates. --expect-loss N Set expected packet loss in percent (default: 0) --downmix-mono Downmix to mono --downmix-stereo Downmix to stereo (if >2 channels input) --no-phase-inv Disable use of phase inversion for intensity stereo. This trades some stereo quality for a higher quality mono downmix, and is useful when encoding stereo audio that is likely to be downmixed to mono after decoding. --max-delay N Set maximum container delay in milliseconds (0-1000, default: 1000) Metadata options --title title Set the track title comment field to title --artist artist Set the artist comment field to artist. This may be used multi- ple times to list contributing artists individually. Note that some playback software does not display multiple artists grace- fully. --album album Set the album or collection title field to album --tracknumber N Set the track number comment field to N --date YYYY-MM-DD Set the date comment field to YYYY-MM-DD. This may be shortened to YYYY-MM or YYYY. --genre genre Set the genre comment field to genre. This option may be speci- fied multiple times to tag a track with multiple overlapping genres. --comment tag=value Add an extra comment. This may be used multiple times. The ar- gument should be in the form "tag=value". See the vorbis-com- ment specification for well known tag names: https://www.xiph.org/vorbis/doc/v-comment.html --picture filename|specification Attach album art for the track. Either a filename for the artwork or a more complete specifica- tion form can be used. The picture is added to a META- DATA_BLOCK_PICTURE comment field similar to what is used in FLAC. The specification is a string whose parts are separated by | (pipe) characters. Some parts may be left empty to invoke default values. Passing a plain filename is just shorthand for the "||||filename" specification. The format of specification is [type]|[media-type]|[descrip- tion]|[widthxheightxdepth[/colors]]|filename type is an optional number describing the nature of the picture. Defined values are from one of: 0: Other 1: 32x32 pixel 'file icon' (PNG only) 2: Other file icon 3: Cover (front) 4: Cover (back) 5: Leaflet page 6: Media (e.g., label side of a CD) 7: Lead artist/lead performer/soloist 8: Artist/performer 9: Conductor 10: Band/Orchestra 11: Composer 12: Lyricist/text writer 13: Recording location 14: During recording 15: During performance 16: Movie/video screen capture 17: A bright colored fish 18: Illustration 19: Band/artist logotype 20: Publisher/studio logotype The default is 3 (front cover). More than one --picture option can be specified to attach multiple pictures. There may only be one picture each of type 1 and 2 in a file. media-type is optional and is now ignored. description is optional. The default is an empty string. The next part specifies the resolution and color information, but is now ignored. filename is the path to the picture file to be imported. --padding n Reserve n extra bytes for metadata tags. This can make later tag editing more efficient. Defaults to 512. --discard-comments Don't propagate metadata tags from the input file. --discard-pictures Don't propagate pictures or art from the input file. Input options --raw Interpret input as raw PCM data without headers --raw-bits N Set bits/sample for raw input (default: 16) --raw-rate N Set sampling rate for raw input (default: 48000) --raw-chan N Set number of channels for raw input (default: 2) --raw-endianness [0/1] Set the endianness for raw input: 1 for big endian, 0 for little (default: 0) --ignorelength Ignore the data length in Wave headers. Opusenc automatically ignores the length when its implausible (very small or very large) but some STDIN usage may still need this option to avoid truncation. Diagnostic options --serial n Force use of a specific stream serial number, rather than one that is randomly generated. This is used to make the encoder deterministic for testing and is not generally recommended. --save-range file Save check values for every frame to a file --set-ctl-int x=y Pass the encoder control x with value y (advanced). Preface with s: to direct the ctl to multistream s This may be used multiple times EXAMPLES Simplest usage. Take input as input.wav and produce output as out- put.opus: opusenc input.wav output.opus Produce a very high quality encode with a target rate of 160 kbit/s: opusenc --bitrate 160 input.wav output.opus Record and send a live stream to an Icecast HTTP streaming server using oggfwd: arecord -c 2 -r 48000 -twav - | opusenc --bitrate 96 - - | og- gfwd icecast.somewhere.org 8000 password /stream.opus NOTES While it is possible to use opusenc for low latency streaming (e.g. with --max-delay set to 0 and netcat instead of Icecast) it's not re- ally designed for this, and the Ogg container and TCP transport aren't the best tools for that application. Shell pipelines themselves will often have high buffering. The ability to set framesizes as low as 2.5 ms in opusenc mostly exists to try out the quality of the format with low latency settings, but not really for actual low latency usage. Interactive usage should use UDP/RTP directly. AUTHORS Gregory Maxwell <greg@xiph.org> SEE ALSO opusdec(1), opusinfo(1), oggfwd(1) Xiph.Org Foundation 2012-08-31 opusenc(1)
NAME | SYNOPSIS | DESCRIPTION | OPTIONS | EXAMPLES | NOTES | AUTHORS | SEE ALSO
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