for i = 1:length(movies)
    input = movie_files[i]
    a1 = eng_audio_track_files[i]
    a2 = commentary_audio_track_files[i]
    sub = subtitle_files[i]
    output = string(m,"_fixed")
    run(`ffmpeg -i $input -i $a1 -i $a2 -map 0:v -map 1 -map 2 -metadata:s:a:0 language=eng -metadata:s:a:1 language=commentary -c copy -shortest $output`)
end