m4a2mp3.sh

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#!/bin/sh

MPLAYER=mplayer
LAME=lame

for m4a in *.m4a; do
    mp3=`echo "$m4a" | sed -e 's/m4a$/mp3/'`
    wav="$m4a.wav"

    if [ ! -e "$mp3" ]; then
        [ -e "$wav" ] && rm "$wav"
	mkfifo "$wav" || exit 255
        mplayer "$m4a" -ao pcm:file="$wav" &>/dev/null &
        lame "$wav" "$mp3"
        [ -e "$wav" ] && rm "$wav"
    fi
done

exit 0;