Документация FFmpeg:
@echo off :: Mp4 to Mp3 ffmpeg\ffmpeg.exe -i video.mp4 audio.mp3 :: Mp4 to Wav ::ffmpeg\ffmpeg.exe -i video.mp4 audio.wav :: Mp3 to Wav ::ffmpeg\ffmpeg.exe -i audio.mp3 audio.wav :: Avi to Mp4 (html) ::ffmpeg\ffmpeg.exe -i video.avi -vcodec libx264 -vprofile high -crf 28 video_html.mp4 :: Vob to Avi ::ffmpeg\ffmpeg.exe -i "concat:VTS_01_1.VOB|VTS_01_2.VOB|VTS_01_3.VOB|VTS_01_4.VOB" -f mpeg -c copy one_video.avi