Retrieve all the factories of the currently registered RTP header extensions. Call gst.element_factory.ElementFactory.create with each factory to create the associated #GstRTPHeaderExtension.
a #GList of #GstElementFactory's. Use gst.plugin_feature.PluginFeature.listFree after use
Retrieve all the factories of the currently registered RTP header extensions. Call gst.element_factory.ElementFactory.create with each factory to create the associated #GstRTPHeaderExtension.