Converting AAC audio files to mp3

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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