WIP: tests/rtpssrcdemux: test for "data flow before segment event" failure
GStreamer-WARNING **: gst_pad_push_data:rtpssrcdemux0:rtcp_src_1111 Got data flow before segment event
By running this test on repeat, the failure will typically happen about 20 times per 1000 runs.
The problem seems to be that when RTP and RTCP arrive pretty much at the same time in ssrcdemux, something goes wrong with sticky forwarding from sinkpads to srcpads.