https://ffmpeg.org/ for i in *.avi; do ffmpeg -i "$i" "${i%.*}.mp4"; done

ripping audiobooks

ripping movies

ffmpeg video

ffmpeg audio

misc

edit metadata

for i in *.ogg; do ffmpeg -i "$i" -metadata album_artist="Runescape" "${i%.*}.new.ogg"; done

https://evanhahn.github.io/ffmpeg-buddy/

Remember common commands!