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.

I still get the "gst-plugins-bad" from them. Soundconverter (GNOME) reports it everytime I open it. The README is gold: https://github.com/GStreamer/gst-plugins-bad