Ffmpeg
From DWIKI
HOWTO
Convert most stuff
ffmpeg -i something.mpg audio.mp3
Convert flac to mp3
ffmpeg -i input.flac -ab 320k -map_metadata 0 -id3v2_version 3 output.mp3
FAQ
create thumbnail from animated gif
ffmpeg -i big.gif -filter:v "scale=100:-1" -vframes 1 ff.gif
