Convert m4a files to mp3

m4a2mp3.sh

#!/bin/bash
# Create "input" and "output" directories. Place m4a files in "input" directory. Run `bash m4a2mp3` and the new mp3 files will be stored in "output".

cd ./input
for filename in ./*; do
        tmp="${filename/.m4a/}";
        echo Converting: "$tmp";
        ffmpeg -v 5 -y -i "$filename" -acodec libmp3lame -ac 2 -ab 128k ../output/"$tmp".mp3;
done