Both scripts should be started from the directory where you keep your music. The .mood files will be generated next to the source music files (in the same directories). You can modify the scripts to have the moods stored to $HOME/.kde/share/apps/amarok/moods/, so as not to clutter your music directories.

Script for multicore CPUs (will not overwrite existing mood files):

#!/bin/bash
NUMCPU="$(grep ^processor /proc/cpuinfo | wc -l)"

find . -type f -regextype posix-awk -iregex '.*\.(mp3|ogg|flac|wma)' | while read i ; do

while [ `jobs -p | wc -l` -ge $NUMCPU ] ; do
sleep 0.1
done

TEMP="${i%.*}.mood"
OUTF=`echo "$TEMP" | sed 's#\(.*\)/\([^,]*\)#\1/.\2#'`
if [ ! -e "$OUTF" ] ; then
moodbar -o "$OUTF" "$i" &
fi
done


Script for single-threaded moods generation (will only overwrite the last-generated mood file from a previous run):

#!/bin/bash
DIR=${1:-.}
LAST=.moodbar-lastreadsong
C_RET=0

control_c() # run if user hits control-c
{
echo "$1" > "$LAST"
echo "Exiting..."
exit
}

if [ -e "$LAST" ]; then
read filetodelete < "$LAST" rm "$filetodelete" "$LAST" fi exec 9< <(find "$DIR" -type f -regextype posix-awk -iregex '.*\.(mp3|ogg|flac|wma)') # you may need to add m4a and mp4 while read i do TEMP="${i%.*}.mood" OUTF=`echo "$TEMP" | sed 's#\(.*\)/\([^,]*\)#\1/.\2#'` trap 'control_c "$OUTF"' INT if [ ! -e "$OUTF" ] || [ "$i" -nt "$OUTF" ]; then moodbar -o "$OUTF" "$i" || { C_RET=1; echo "An error occurred!" >&2; }
fi
done <&9 exec 9<&- exit $C_RET

That same page has a link to an older, somewhat more polished ruby script for the same task. It requires a running instance of Amarok, and uses it's media collection to find music files and create mood files for them. This script can potentially (after a little editing) store .mood files either with the music or to the $HOME/.kde/... path mentioned above. It is for an older version of Amarok, and thus is not likely to work with e.g. Amarok 2.4


#!/usr/bin/ruby

# Simple moodbar file management utility by Joe Rabinoff
# This is also my first ever ruby script so bear with me

$moodbar_folder = "#{ENV['HOME']}/.kde/share/apps/amarok/moods/"

def usage()
print "This is the moodbar file management utility\n"
print "\n"
print "Usage is:\n"
print " moodbar_util.rb -rename Rename mood files" \
+ " from any old naming scheme to the current one\n" \
+ " (not applicable when mood" \
+ " files are stored with music)\n"
print " moodbar_util.rb -calcall Calculate all un-calculated" \
+ " mood files\n"
exit(1)
end

def check_amarok_running()
result = `dcop 'amarok*'`.split("\n")
return (result.length > 0)
end

def get_devices()
result = `dcop amarok collection query 'SELECT id, lastmountpoint FROM devices;'`.split("\n")
ret = Hash.new()
result.each_index do |i|
ret[result[i].to_i] = result[i+1] if i % 2 == 0
end
return ret
end

def mood_name(url, deviceid)
ret = url.gsub(/\//, ',')
return deviceid.to_s + "," + ret
end

def rename()
print "Renaming mood files from outdated naming schemes...\n"

# As far as I can tell, the best way to do this is just select all
# tracks, check the old possible moodbar names, and rename them
tracks = `dcop amarok collection query 'SELECT url, deviceid FROM tags;'`.split("\n")
devices = get_devices

0.step(tracks.length-1, 2) do |i|
url = tracks[i].sub(/\.[^\.]*$/, '.mood')
deviceid = tracks[i+1].to_i

path = url.sub(/\./, '')
if devices.has_key?(deviceid)
path = devices[deviceid] + path
end
moodfile = $moodbar_folder + mood_name(url, deviceid)
moodfile1 = $moodbar_folder + path.gsub(/\//, ',')

next if FileTest.exists?(moodfile)

if FileTest.exists?(moodfile1)
system("mv", "-f", moodfile1, moodfile)
print "Moved ", moodfile1, " to ", moodfile, "\n"
end

end

end

def calcall()
print "Calculating all nonexisting moodbars...\n\n"

tracks = `dcop amarok collection query 'SELECT url, deviceid FROM tags;'`.split("\n")
devices = get_devices
withMusic = (`dcop amarok script readConfig MoodsWithMusic`.chomp == "true")

0.step(tracks.length-1, 2) do |i|
url = tracks[i]
deviceid = tracks[i+1].to_i

moodfile = ""

songpath = url.sub(/\./, '')
if devices.has_key?(deviceid)
songpath = devices[deviceid] + songpath
end

if withMusic
moodfile = songpath.sub(/\.[^\.]*$/, '.mood')
moodfile = File.dirname(moodfile) + "/." + File.basename(moodfile)
else
moodfile = $moodbar_folder \
+ mood_name(url.sub(/\.[^\.]*$/, '.mood'), deviceid)
end

next if FileTest.exists?(moodfile) && FileTest.size(moodfile) > 0
next unless FileTest.exists?(songpath)

print "Saving moodbar for ", songpath, "\n"
print " to file ", moodfile, "\n"
system("moodbar", "-o", moodfile, songpath)
print "\n"

end

end

$mode = ARGV[0]

if !check_amarok_running
print "Amarok is not running! Please start Amarok and re-run " \
"this script.\n"
end

if $mode == "-rename"
rename
elsif $mode == "-calcall"
calcall
else
usage
end