How can I see what GStreamer plugins I have on my system ?
To do this you use the gst-inspect command-line tool, which comes standard with GStreamer. Invoked without any arguments, $ gst-inspect will print out a listing of installed plugins. To learn more about a particular plugin, pass its name on the command line. For example, $ gst-inspect volume will give you information about the volume plugin. Also, if you install the gst-editor package, you will have a graphical plugin browser available, gst-inspect-gui.