movie-music-kitchen separate movie into audio file and movie-only file e.x ls movies/ | xargs -L 1 -I @ ffmpeg -i ./movies/@ -acodec copy -map 0:1 ./output/audio/@.aac ls movies/ | xargs -L 1 -I {} ffmpeg -i ./movies/{} -vcodec copy -map 0:0 ./output/audio/{}.mp4