Script to convert .m4a to .mp3

Put all your .m4a files (that you want to convert) into a folder and execute the following script from within this folder, make sure to make this script executable (chmod 777 m4a2mp3.sh)

#!/bin/sh
# name of this script: m4a2mp3.sh
# m4a to mp3

for i in *.m4a; do
  faad "$i"
  x=`echo "$i"|sed -e 's/.m4a/.wav/'`
  y=`echo "$i"|sed -e 's/.m4a/.mp3/'`
  lame -h -b 192 "$x" "$y"
  rm "$x"
done

Dependencies

faad2 and lame