Add the following lines to your /etc/apt/sources.list
:
deb http://rygel-project.org/raspbian wheezy/ deb-src http://rygel-project.org/raspbian wheezy/ deb http://vontaene.de/raspbian-updates/ . main
and run apt-get install raspbian-dlna-renderer
to install all the meta-package which pulls in all the necessary stuff. The last repository is necessary to get GStreamer 1.0 for Raspbian which has support for hardware-decoding on the Pi.