Finds the #GstDiscovererStreamInfo contained in info that match the given streamtype.
a #GType derived from #GstDiscovererStreamInfo
A #GList of matching #GstDiscovererStreamInfo. The caller should free it with gstpbutils.discoverer_stream_info.DiscovererStreamInfo.listFree.
Finds the #GstDiscovererStreamInfo contained in info that match the given streamtype.