GStreamer is a library that allows the construction of graphs of
media-handling components, ranging from simple mp3 playback 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.
This package provides the ogg plugin for GStreamer, which lets it handle
OGG media containers. You'll probably want to install gst-plugins1-vorbis
and gst-plugins1-theora too, which provide its respective audio and video
codecs.