Why do these two Gstreamer pipelines work fine separately, but fail when tee'd from the source?

[PeterT]

The below pipeline works fine if I either send it to UDP, or if I sent to a
file. When I connect them with a tee, the pipeline does nothing (no data
sent to file or UDP port). No errors are printed, however, when I hit CTRL-C
the pipeline waits for EOL shutdown and I have to CTRL-C again.
gst-launch-1.0 -e \  rtspsrc location='rtsp://userid:pwd@10.0.0.1:554'
latency=100 ! \  tee name=t ! \    queue ! \    rtph264depay ! \   
h264parse ! \    mp4mux ! \    filesink location=tee.mp4 \  t. ! \    queue
! \    udpsink host=192.168.1.140 port=5000
This works fine:
gst-launch-1.0 -e \  rtspsrc location='rtsp://userid:pwd@10.0.0.1:554'
latency=100 ! \  rtph264depay ! \  h264parse ! \  mp4mux ! \  filesink
location=tee.mp4
...and this works fine:
gst-launch-1.0 -e \  rtspsrc location='rtsp://userid:pwd@10.0.0.1:554'
latency=100 ! \  udpsink host=192.168.1.140 port=5000
Thoughts?



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