UNIX: convert m4a to mp3

First, convert m4a to wav:
Single file

mplayer -ao pcm mysong.m4a -ao pcm:file="mysong.wav"

Multiple files

#!/bin/bash
# 
# m4a2wav
# 
for i in *.m4a; do
    mplayer -ao pcm "$i" -ao pcm:file="${i%.m4a}.wav"
done

Then, convert wav to mp3:
Single file

lame -h -b 192 mysong.wav mysong.mp3

Multiple files

#!/bin/bash 
# 
# wav2mp3
# 
for i in *.wav; do
    lame -h -b 192 "$i" "${i%.wav}.mp3"
done

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