Convert m4a to mp3 Script

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Convert m4a to mp3 Script

20 April 2011 @ 13:45 BST

by Paul

Some media players can't play protected m4a's. This script converts the m4a passed on the command line to an mp3 that can then be copied to your selected media player:

#!/usr/bin/bash
#
# copy and convert
#
# Transcode m4a file to mp3
#
# This script is heavily based on the original here:
# http://www.minigeek.org/2007/07/linux-m4a-to-mp3-conversion-script
#
# Naturally, changes are licensed under the GPL
#

orig=$1
temp_wav=`tempfile --directory ~/tmp --suffix=".wav"`

mp3=`echo "$orig"|sed -e 's/\.m4a/\.mp3/'`
temp_trackinfo=`tempfile --directory ~/tmp --suffix=".txt"`

# deal with track info
faad -i ${orig} 2>$temp_trackinfo
sed -i '23s/unknown: /title: /' $temp_trackinfo
sed -i '24s/unknown: /artist: /' $temp_trackinfo

year=`grep 'date: ' $temp_trackinfo|sed -e 's/date: //'`

sed -i 's/unknown: iTunes/iTunes: iTunes/' $temp_trackinfo

genrecount=`grep -c 'genre: ' $temp_trackinfo`
unknowncount=`grep -c 'unknown: ' $temp_trackinfo`

if [ "$genrecount" -eq 1 ] && [ "$unknowncount" -eq 2 ]; then
    sed -i '25s/unknown: /composer: /' $temp_trackinfo
    sed -i '26s/unknown: /album: /' $temp_trackinfo
    genre=`grep 'genre: ' $temp_trackinfo|sed -e 's/genre: //'`
fi

if [ "$genrecount" -eq 1 ] && [ "$unknowncount" -eq 1 ]; then
    sed -i '25s/unknown: /album: /' $temp_trackinfo
    genre=`grep 'genre: ' $temp_trackinfo|sed -e 's/genre: //'`
fi

if [ "$genrecount" -eq 0 ] && [ "$unknowncount" -eq 3 ]; then
    sed -i '25s/unknown: /composer: /' $temp_trackinfo
    sed -i '26s/unknown: /album: /' $temp_trackinfo
    sed -i '27s/unknown: /genre: /' $temp_trackinfo
    genre='other'
fi

if [ "$genrecount" -eq 0 ] && [ "$unknowncount" -eq 2 ]; then
    sed -i '25s/unknown: /album: /' $temp_trackinfo
    sed -i '26s/unknown: /genre: /' $temp_trackinfo
    genre='other'
fi
	
title=`grep 'title: ' $temp_trackinfo|sed -e 's/title: //'`
artist=`grep 'artist: ' $temp_trackinfo|sed -e 's/artist: //'`
album=`grep 'album: ' $temp_trackinfo|sed -e 's/album: //'`
track=`grep 'track: ' $temp_trackinfo|sed -e 's/track: //'`

## convert to wav

faad -o $temp_wav $orig

## convert to mp3
lame --alt-preset 192 --id3v2-only --tt "$title" --ta "$artist" --tl "$album" --tg "$genre" --tn "$track" --ty "$year" "$temp_wav" "$mp3"

## clean-up

rm $temp_wav
rm $temp_trackinfo

exit 0

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