WikiMuX

ffmpeg -threads 8 -i file.MTS -codec:s copy -codec:v libx264 -codec:a copy file.mkv

ffmpeg -i file.webm -vn -ab 128k -ar 44100 -y file.mp3

ffmpeg -i file.mp4 file.mp3

ffmpeg -i file.m4a -acodec libmp3lame -ab 128k file.mp3

for file in *.mts; do ffmpeg -threads 8 -i "$file" -codec:s copy -codec:v libx264 -codec:a copy "${file%.mts}.mkv"; done

for file in *.webm; do ffmpeg -i "$file" -vn -ab 128k -ar 44100 -y "${file%.webm}.mp3"; done

for file in *.mp4; do ffmpeg -i "$file" "${file%.mp4}.mp3"; done

for file in *.m4a; do ffmpeg -i "$file" -acodec libmp3lame -ab 128k "${file%.m4a}.mp3"; done

for file in *.mkv; do ffmpeg -i "$file" -vn -c:a libmp3lame "${file%.m4a}.mp3"; done