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My audio container is M4A, but codec is AAC. When I try to convert it into MP3 I got an error:

afconvert ~/Desktop/src.m4a -f MPG3 -d .mp3 ~/Desktop/dst.mp3
Error: ExtAudioFileSetProperty ('cfmt') failed ('fmt?')

enter image description here

1 Answer 1

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Could you just use ffmpeg?

ffmpeg -i file.m4a -aq 2 file.mp3

-aq 2 corresponds to -V2 in lame. ffmpeg preserves tags but not cover art.

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  • Unfortunately there is no ffmpeg installed on OSX so I have to figure out what is wrong with afconvert. Can't install macports or make from sources on that machine.
    – Pablo
    Nov 2, 2013 at 21:44
  • @Pablo You don't have to. On the FFmpeg download page there's a static build that you can just execute. If you do a -c:v copy it might copy the cover art over as well.
    – slhck
    Nov 3, 2013 at 7:43

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