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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[gotsring]

Can anyone else comment?

At least for me (Gst 1.18.2 on Windows 10 using local IP camera) the
pipelines fail to start because mp4mux can't negotiate caps successfully, I
suspect because of the codec_data cap. The warnings for this were displayed
running when running with gst-debug=3.

I don't know enough about codec_data on whether this is required or if it
can be stripped by another element. This is the pipeline that worked for me,
though not ideal:
gst-launch-1.0 rtspsrc location='rtsp://10.42.0.59/1' latency=100 !
rtph264depay ! h264parse ! nvh264dec ! videoconvert ! nvh264enc ! mp4mux !
filesink location=test.mp4



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