This package contains GStreamer 1.0 backend for Phonon multimedia framework. It transparently adapts and reroutes all requests from Phonon applications to the GStreamer framework which in turn performs requested audio/video decoding/capture tasks.

You should install gstreamer1.0-plugins-good to get support for playing popular free multimedia formats and gstreamer1.0-plugins-ugly to get support for popular MPEG audio formats like MP3.