GStreamer is a library for constructing graphs of media-handling components. The applications it supports range from simple Ogg/Vorbis playback, audio/video streaming to complex audio (mixing) and video (non-linear editing) processing.
Applications can take advantage of advances in codec and filter technology transparently. Developers can add new codecs and filters by writing a simple plugin with a clean, generic interface.
GStreamer is an open-source library released under the GNU Library General Public License (GNU LGPL).
To learn more, visit http://gstreamer.freedesktop.org/.