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png2yuv(1) MJPEG tools manual png2yuv(1) NAME png2yuv - Convert PNG images to the YUV4MPEG stream format. SYNOPSIS png2yuv [-b num] [-f num] [-I num] [-L num] [-n num] [-j filename] DESCRIPTION png2yuv decompresses a sequence of PNG files and pipes the image data to stdout as a YUV4MPEG2 stream. Any 8bit/pixel PNG format supported by libpng can be read. stdout will be filled with the YUV4MPEG movie data stream, so be prepared to pipe it on to mpeg2enc or to write it into a file. This tool is incomplete. The alternative utility you are probably looking for is ppmtoy4m(1), which is also included in MJPEGtools. OPTIONS png2yuv accepts the following options: -b num Frame offset: skip output of the first 'num' frames. (default: 0) -f num Set the frame rate of stream accepts the same numbers. Not de- fault, this option has to be specified. -I num interlacing mode: p = none / progressive t = top field first b = bottom field first No default, this option has to be specified. -L num 0 = non-interleaved (two successive fields per PNG file) 1 = interleaved fields -S samp_mode chroma subsampling mode, only for professionals, for more info see ppmtoy4m and the YUV guide on http://www.mir.com/DMG/. default: 420_jpeg -n num Specifies the nummber of frames to process. (default: all = -1) -j {1}%{2}d{3} Read PNG frames with the name components as follows: {1} PNG filename prefix (e g: picture_ ) {2} Counting placeholder (like in C, printf, eg 06 )) {3} File extension. Something like this: .png A correct descrip- tion of the files could look like this: picture_%06d.png -v num Verbosity level (0, 1 or 2) BUGS The frame rate description does not seem to be up to date. The NTSC in- teger ratios are not supported (use floating point instead). As workaround specify a PAL (25) or native FILM (24) and set the right frame rate in mpeg2enc with the -F option. Interlaced handling is not implemented yet. AUTHOR This man page was written by Gernot Ziegler. If you have questions, remarks, problems or you just want to contact the developers, the main mailing list for the MJPEG-tools is: mjpeg-users@lists.sourceforge.net For more info, see our website at http://mjpeg.sourceforge.net SEE ALSO mjpegtools(1), mpeg2enc(1), ppmtoy4m(1), yuv2lav(1), yuvdenoise(1), yu- vmedianfilter(1), yuvscaler(1) MJPEG Tools Team 22 January 2020 png2yuv(1)
NAME | SYNOPSIS | DESCRIPTION | OPTIONS | BUGS | AUTHOR | SEE ALSO
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