Update: How to recover mp3′s after an iPod database crash

Mike Adolphs — Wed, 11 Mar 2009 21:11:52 +0000

I’ve recently wrote about recovering mp3′s from an iPod which expierenced a database crash after e.g. messing around with gnupod. As you may have seen the script wasn’t complete it all.
It was a quick’n'dirty hack to copy all the files from a mounted iPod to a local directory where they were sorted into specific directories depending on the artist’s and the album’s name. Furthermore, the script didn’t expand single-digit track numbers with a leading zero. That made it somewhat difficult to hear albums in the right order.

Therefore, I’ve decided today to expand the script a little more. Here are the details:

The script now works with id3v1 and id3v2. Therefore it’s necessary to have id3tool and id3v2 installed from your prefered package management system. It parses the file’s id3 tags and copies all files in a /ARTIST/ALBUM/TRACKNO-TITLE.mp3 format from the iPod to a local directory which you can specify in the second line of the actual script as the output variable. If the track number of the mp3 is single-digit, the script will expand it to a two-digit track number with a leading 0 to preserve the album’s tracklist.
When it stumble upon a file without an id3 tag or a different file extension like .m4a it copies the files to the no-tags/ directory which is created in the specified output directory at the beginning of the script. Then you’ll have the chance to order them manually after running the script.

Grab the script from the code section below as long as I don’t provide git access (which will be available soon):

#!/bin/sh
 
#   This program is free software; you can redistribute it and/or modify
#   it under the terms of the GNU General Public License as published by
#   the Free Software Foundation; version 2 of the License only.
#
#   This program is distributed in the hope that it will be useful,
#   but WITHOUT ANY WARRANTY; without even the implied warranty of
#   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
#   GNU General Public License for more details.
#
#   You should have received a copy of the GNU General Public License
#   along with this program; if not, write to the Free Software
#   Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
 
#   Author: Mike Adolphs, 2009 (http://www.matejunkie.com/)
#   Version: 0.2, Date: 2009-03-11
 
# define input/output directories
input=/mnt/ipod/iPod_Control/Music/f*
output=/opt/music
 
# create no-id3v1 directory
mkdir $output/no-tags
 
# Let's do this...
files=`find $input -type f`
for i in $files
do
    v1_title=`id3tool $i | grep '^Song Title:' | sed 's/Song Title:\t//' | sed 's/[ \t]*$//'`
    v1_artist=`id3tool $i | grep '^Artist:' | sed 's/Artist:\t\t//' | sed 's/[ \t]*$//'`
    v1_album=`id3tool $i | grep '^Album:' | sed 's/Album:\t\t//' | sed 's/[ \t]*$//'`
    v1_tno=`id3tool $i | grep '^Track:' | sed 's/Track:\t\t//' | sed 's/[ \t]*$//'`
 
    v1_tno_length=`expr length "$v1_tno"`
    if [ "$v1_tno_length" = 1 ]
    then
        v1_tno="0$v1_tno"
    fi
 
    if [ -z "$v1_title" ]
    then
        v2_title=`id3v2 -l $i | grep '^TIT2' | sed 's#TIT2 (Title/songname/content description): ##'`
        if [ -z "$v2_title" ]
        then
            v2_title=`id3v2 -l $i | grep '^TT2' | sed 's#TT2 (Title/songname/content description): ##'`
        fi
        v2_artist=`id3v2 -l $i | grep '^TPE1' | sed 's#TPE1 (Lead performer(s)/Soloist(s)): ##'`
        if [ -z "$v2_artist" ]
        then
            v2_artist=`id3v2 -l $i | grep '^TP1' | sed 's#TP1 (Lead performer(s)/Soloist(s)): ##'`
        fi
        v2_album=`id3v2 -l $i | grep '^TALB' | sed 's#TALB (Album/Movie/Show title): ##'`
        if [ -z "$v2_album" ]
        then
            v2_album=`id3v2 -l $i | grep '^TAL' | sed 's#TAL (Album/Movie/Show title): ##'`
        fi
        v2_tno=`id3v2 -l $i | grep '^TRCK' | sed 's#TRCK (Track number/Position in set): ##'`
        if [ -z "$v2_tno" ]
        then
            v2_tno=`id3v2 -l $i | grep '^TRK' | sed 's#TRK (Track number/Position in set): ##' | sed 's#/[0-9]*##'`
        fi
 
        v2_tno_length=`expr length "$v2_tno"`
        if [ "$v2_tno_length" = 1 ]
        then
            v2_tno="0$v2_tno"
        fi
        if [ -z "$v2_title" ]
        then
            echo "!!! $i !!! --> $output/no-tags/"
            install -D $i "$output/no-tags/"
        fi
 
        echo "$i --> $output/$v2_artist/$v2_album/$v2_tno-$v2_title.mp3"
        install -D $i "$output/$v2_artist/$v2_album/$v2_tno-$v2_title.mp3"
    else
        echo "$i --> $output/$v1_artist/$v1_album/$v1_tno-$v1_title.mp3"
        install -D $i "$output/$v1_artist/$v1_album/$v1_tno-$v1_title.mp3"
    fi
done
 
exit

As always this little script is ment to be sh-compliant and released under the terms of the GPL Version 2. Please be aware of the fact, that you’ll have to install the id3tool and id3v2 via your prefered package management software before running this script. Otherwise it won’t work.

The script will probably be enhanced in the near future with an option parser and the possibility to select between different output formats. I also think about dropping the id3tool support as id3v2 also displays id3v1 information. Let me know if you have ideas or suggestions to enhance the script further.

Matejunkie » id3v2

Update: How to recover mp3′s after an iPod database crash