tsdemux over tcpclientsrc shouts THIS SHOULD NOT HAPPEN!
gst-launch-1.0 videotestsrc ! queue ! x264enc ! h264parse ! queue ! mpegtsmux ! queue ! tcpserversink host=127.0.0.1 port=7777
in another shell
$ env GST_DEBUG=3 gst-launch-1.0 tcpclientsrc host=127.0.0.1 port=7777 ! queue ! tsparse ! tsdemux ! queue ! h264parse ! avdec_h264 ! queue ! videoconvert ! autovideosink 2>&1 |grep HAPPEN
0:00:00.159897926 22701 0x5574894f99e0 WARN tsdemux tsdemux.c:2227:check_pending_buffers: THIS SHOULD NOT HAPPEN !