This GStreamer plugin supports a large number of audio and video compression formats through the use of the FFmpeg library. The plugin contains GStreamer elements for decoding 90+ formats (AVI, MPEG, OGG, Matroska, ASF, ...), demuxing 30+ formats and colorspace conversion.

http://www.ffmpeg.org/ http://gstreamer.freedesktop.org/ http://gstreamer.freedesktop.org/modules/gst-ffmpeg.html