Converting .m4a to .mp3

Use online converter like: http://media-convert.com/ or

sudo port install mplayer-devel lame

for i in *.m4a
do
  mplayer -ao pcm:file="$i.wav" "$i"
  lame -h -b 192 "$i.wav" "$i.mp3"
done

Source: http://www.linuxquestions.org/

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