Dependencies

• libmad for mp3 support and libvorbis for ogg (on debian/ubuntu, these can be installed with 'sudo apt-get install libmad0-dev libvorbis-dev)
• Marsyas (release, or if you get an INT_MAX error, try checking out from svn with svn co https://marsyas.svn.sourceforge.net/svnroot/marsyas/trunk marsyas)
• To install Marsyas with mp3 and ogg support, run ./configure --with-mad --with-vorbis, then the usual make && make install

After Marsyas is successfully installed, In the Mood can be installed with ./configure && make && make install.

First Launch

If everything went well, the first time you start Rhythmbox and enable the "In the Mood" plugin, a new playlist (called, surprisingly enough, "In the Mood") should appear. However, In the Mood needs to first build a database of feature vectors before it can function. This can be started by either clicking on "Begin Analysis" in the plugin configuration dialogue, or by restarting Rhythmbox, which will cause a popup to appear to remind you that the analysis is not complete.

Song analysis is a fairly intensive and time-consuming procedure and will take anywhere from half a second to 3 seconds per song. Once this one-time analysis is complete, In the Mood can be started by dragging a song onto the "In the Mood" playlist. This should cause a new song to be appended to the playlist. When the new song starts playing, another will be added and so on. By default, In the Mood picks the next song based on the initial 'seed' song, but if you would prefer an evolving playlist that chooses the next song based on the last in the list, you can select 'evolution' mode in the plugin configuration.

Caveats

• In the Mood only supports ogg, mp3, and wav files. If you choose a song that could not be analyzed (either the wrong format, or a corrupt file), In the Mood will not work.
• Currently, the generated playlist is deleted when Rhythmbox is closed. If you wish to save the playlist, you can select all the songs and then right click->new playlist, or save the playlist to a file.