This command will convert an AAC audio file to an mp3 audio file:

ffmpeg -i input.m4a -acodec mp3 -ac 2 -ab 128 output.mp3

Batch conversion can be done with

for i in *.m4a; do
    ffmpeg -i "$i" -acodec mp3 -ac 2 -ab 128 "${i%m4a}mp3";
done

Sometimes it really is simple 🙂

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September 12, 2005

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