Theora and Vorbis Encoding guide: ffmpeg -i input.avi -codec:v libtheora -qscale:v 7 -codec:a libvorbis -qscale:a 5 output.ogv ffmpeg -i input.avi -f mp4 -vcodec mpeg4 -b 1500 -qmin 3 -qmax 5 -s 320x256 -b 384 output.m4v параметры: установить видео кодек: -codec:v установить аудио кодек: -codec:a -qscale[:stream_specifier] q (output,per-stream) Use fixed quality scale (VBR). The meaning of q/qscale is codec-dependent. If qscale is used without a stream_specifier then it applies only to the video stream, this is to maintain compatibility with previous behavior and as specifying the same codec specific value to 2 different codecs that is audio and video generally is not what is intended when no stream_specifier is used. -f fmt (input/output) Force input or output file format. The format is normally auto detected for input files and guessed from the file extension for output files, so this option is not needed in most cases.
получить информацию о видеофайле: mplayer -vo null -ao null -identify -frames 0 /path/to/file или ffmpeg -i /path/to/file или exiftool /path/to/file или avprobe somefile.mp4
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