Amarok/Manual/Various/Moodbar

    From KDE UserBase Wiki

    The Moodbar

    The Moodbar shows you the "mood" of a track, which you can then use to figure out when something interesting happens in the song.

    In order for Amarok to display moodbars for your music, you will need the Moodbar program (see below for downloads and binary packages).

    The Moodbar package requires GStreamer and various plugins depending on the filetypes you use (see Supported filetypes). You will not need the phonon-backend-gstreamer package to create .mood files.

    There are two parts to the new Moodbar implementation: the Moodbar package, which contains a program that takes a music file and generates a .mood file, and support code in the Amarok source, which runs the binary and displays the Moodbar. The Moodbar package depends on the GStreamer libraries. Without the Moodbar package, Amarok cannot generate the moodbars for your music.

    As an alternative, there is a new script which will create moodbar files for tracks in an Amarok playlist; this is an exception to the above. The script needs nothing but Amarok to work, but it only creates the .mood files as they are played in the Playlist.

    The Moodbar is due to the work of Gavin Wood and Simon O'Keefe, who designed the algorithms; their original paper is here.

    Summary of Requirements

    • The Moodbar binary, in your PATH (it should be listed upon running
      which moodbar
      from a console) — Remember to configure the Moodbar package with proper path, e.g. build and install with commands
      ./autogen.sh --prefix=`pkg-config --variable=prefix gstreamer-1.0` && make && sudo make install
    • The GStreamer 1.0 library and plugins for the formats you want Moodbar to be able to analyse. (An earlier GStreamer 0.10 based version is also still available for some distributions)
    • The Fastest Fourier Transform In The West (fftw.org) FFTW library version 3.0 or above (at least single-precision floating point version - libfftw3f) — If your platform does not provide this for you or you need to compile your own version, remember to configure the FFTW package with
      ./configure --enable-single
    • A version of Amarok with a Use moods option in the General section of the configuration screen. This means 1.4.4 or higher in the 1.4 series or 2.2.2 or higher in the 2.x series.

    Information

    Systems with package managers should automatically install the GStreamer plugins and FFTW along with the Moodbar package if available; this information is provided mostly for people who want or need to compile from source or manually install packages, or where the distribution specific instructions are outdated and no updated moodbar package is yet available.


    Usage

    Currently .mood files must be generated manually. Amarok cannot do it for you. To do this for your entire collection, use the Moodbar File Generation Script described below.

    To enable the display of moodbars in Amarok, activate it in the configuration: Settings -> Configure Amarok -> General -> Show Moodbar in Progress Slider. Moodbars should now appear in the track sliders in the player window and Playlist; there will also be a mood field that you may add to your playlist layouts.

    Installation

    Source Downloads
    Latest release: moodbar-0.1.4.tar.gz — this is the Moodbar source package, which contains the Moodbar program (which generates .mood files from music files), and a GStreamer plugin that does the work. The Moodbar package needs GStreamer 1.0.* installed, plus the 1.0.* version of various plugins. Be sure to install the Moodbar package into the same prefix as GStreamer — follow the instructions in  the summary of requirements chapter. The 0.1.4 is a a fork of original 0.1.2 sources, updated to use GStreamer 1.0. The old 0.1.2 sources are not reliably available online any more, but packages might be still available for some distributions.

    If you find any bugs, please submit a bug report at bugs.kde.org.

    Debian packages

    Note

    This section contains old instructions for the GStreamer 0.10 based moodbar version 0.1.2, they might be outdated.

    A package for Moodbar is now available in Debian unstable. Simply run

    apt-get install moodbar

    . You will likely also want to install gstreamer0.10-plugins-ugly, gstreamer0.10-plugins-good, and gstreamer0.10-plugins-bad for format support.

    Kubuntu and Ubuntu packages

    Note

    This section contains old instructions for the GStreamer 0.10 based moodbar version 0.1.2, they might be outdated.

    A package for Moodbar is available in the official package repository; just ensure the universe section is activated (which should be default anyway). Just install the package moodbar with your preferred package manager (Kpackagekit, Aptitude, Adept, Synaptic). You will likely also want to install gstreamer0.10-plugins-ugly, gstreamer0.10-plugins-good, and gstreamer0.10-plugins-bad for format support.

    Or, to install, paste this into Firefox or Konqueror and hit Enter.

    apt://moodbar,gstreamer0.10-plugins-ugly,gstreamer0.10-plugins-good,gstreamer0.10-plugins-bad?section=universe?refresh=yep
    Gentoo ebuilds

    Note

    This section contains old instructions for the GStreamer 0.10 based moodbar version 0.1.2, they might be outdated.

    Moodbar is available in Portage, simply

    emerge moodbar

    Unofficial ebuilds are no longer required.

    RPM builds

    Note

    This section contains old instructions for the GStreamer 0.10 based moodbar version 0.1.2, they might be outdated

    If you are a rpm-based distro user, you can build a .rpm using rpmbuild with latest gstreamer-plugins-moodbar.spec. The binary package will be soon available for PLD-linux distro.

    Fedora

    Note

    This section contains old instructions for the GStreamer 0.10 based moodbar version 0.1.2, they might be outdated.

    In Fedora 7 and higher (up to 16 as of this writing) Moodbar is available in the default repositories. Simply install it with your PackageKit GUI or with the following yum command:

    yum install moodbar
    openSUSE packages

    GStreamer 1.0 based version 0.1.4 is available in KDE:Extra repository for openSUSE Leap 42.3 and later. An earlier GStreamer 0.10 based version 0.1.2 is also still available in the main repository for some openSUSE versions.

    For details on how to add repositories, see the openSUSE wiki.


    1-Click Install for openSUSE - just choose your version and installation procedure will do the rest:


    Mandriva packages

    Note

    This section contains old instructions for the GStreamer 0.10 based moodbar version 0.1.2, they might be outdated.

    First of all, you need to add PLF repositories, so visit easyurpmi.zarb.org and add them to your repositories list. Then simply install the following packages:

    • gstreamer0.10-moodbar
    • gstreamer0.10-plugins-ugly
    • gstreamer0.10-plugins-good
    • gstreamer0.10-plugins-bad
    Arch Linux

    Note

    This section contains old instructions for the GStreamer 0.10 based moodbar version 0.1.2, they might be outdated.

    There is a PKGBUILD for Moodbar in the Arch User Repository (AUR) available here.

    For more information about the AUR and working with PKGBUILDs, see the AUR User Guidelines.

    FreeBSD

    Note

    This section contains old instructions for the GStreamer 0.10 based moodbar version 0.1.2, they might be outdated.

    There is a port: audio/gstreamer-plugins-moodbar here.

    To install the port:

    cd /usr/ports/audio/gstreamer-plugins-moodbar/ && make install clean

    To add the package:

    pkg_add -r gstreamer-plugins-moodbar

    Moodbar File Generation Script

    Here is a simple bash script that will add .mood files to your entire collection. It adds mood files for all files matching the extensions in the current directory and all subdirectories, so it's best run from the base of your music directory.

    #!/bin/bash
     DIR=${1:-.}
     LAST=~/.moodbar-lastreadsong
     C_RET=0
     
     control_c()        # run if user hits control-c
     {
       echo "" > "$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
    

    Copy and paste the above into a text file named moodbar.sh in your music directory and run the following commands:

    cd /path/to/music
     bash moodbar.sh

    Alternatively if the above does not work, you may try:

    chmod +x moodbar.sh
     ./moodbar.sh

    This may take a very long time for large collections! Note that the moodbars will not appear in Amarok until Amarok rescans the collection. The generated mood files will be dotfiles (i.e., prefixed with a full stop), or hidden files - so keep this in mind if you can't find any generated mood files.

    Based on the above script, an alternative for multicore CPUs:

    #!/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
    


    Troubleshooting

    • If the Moodbar executable gives you a bus error, that almost always means it can't decode (or can't find) your file. Take a look at the supported file types below for ideas on which GStreamer plugins to install. You can also try the command below to test whether GStreamer can decode your file:
      gst-launch-1.0 filesrc location=[file] ! decodebin ! fakesink
    • If you are using the ffmpeg plugin to decode mp3s, you may also receive mysterious bus errors. The solution is to stop using the ffmpeg plugin, as it is extremely buggy — use mad instead.
    • If the Moodbar executable tells you that it can't find an element — i.e., it gives an error message like
      Could not create element of type fftwspectrum, please install it.
      — that usually means that you either don't have the required plugins installed (see the plugin list here), or that you didn't install the Moodbar package in the same prefix as GStreamer. If libmoodbar.so and libgstdecodebin.so are not in the same directory, then Moodbar is not installed in the same prefix as GStreamer. Please read the INSTALL file for instructions on how to configure the moodbar package correctly. Alternatively, if you know what you're doing, it may be easier for you to take a look at the GST_PLUGIN_PATH environment variable.
    • If you're wondering why the Moodbar isn't working, either not working at all or not working for a particular file, run the command below, where [file] is a music file:
      moodbar -o test.mood [file]
      To generate a test image preview, one can use the commandː
      gst-launch-1.0 filesrc location=[file] ! decodebin ! audioconvert ! fftwspectrum ! moodbar height=50 max-width=300 ! pngenc ! filesink location=mood.png
    • If you have multiple versions of GStreamer installed, make sure all of the required plugins are installed for version 1.0.* -- different versions cannot use each other's plugins.

    Supported Filetypes

    You will need various Gstreamer plugins to enable Moodbar to analyze your files. Here is a list of the plugins you will need; make sure to install the 1.0.* version of each plugin:

    Filetype Required Plugin Note
    All gstreamer-1.0.*, gst-plugins-base, gst-plugins-good
    mp3 gst-plugins-mad (in gst-plugins-ugly) ffmpeg plugin has problems; do not use for mp3
    ogg gst-plugins-vorbis, gst-plugins-ogg
    flac gst-plugins-flac
    mp4 gst-plugins-faad, gst-plugins-bad
    musepack gst-plugins-musepack
    wma gst-plugins-ffmpeg

    Screenshots

    Moodbar in progress slider in Amarok 2
    Moodbar in progress slider in Amarok 2