Onvif-backchannel examples

[Stefan Ulbrich]

Hi List

I want to send audio to an onvif-compliant IP camera (Amcrest) and
therefore, I have compiled gstreamer-1.14.1-* on Ubuntu 16.04 (installed to
/usr/local). I now tried:

   1. ./gst-plugins-good-1.14.1/tests/examples/rtsp/test-onvif rtsp://
   admin:XXXX at 192.168.2.116:554/cam/realmonitor?channel=1&subtype=0&unicast=true&proto=Onvi
   But nothing is audible on the camera. While the program is running, I
   cannot send audio via the manufacturer's android app so I think the
   connection is established.
   2. I changed the audio signal in test-onvif.c to a sine signal (by
   removing `wave=red-noise`). Without suggess
   3. Wireshark shows that there is data exchanged between ubuntu and the
   camera
   `58422 149.274903247 192.168.2.125 192.168.2.116 RTCP 126 Receiver Report
      Source description`
   4. I build the gst-rtsp-server-1.14.1/examples/test-onvif-backchannel
   and replaced `fakesink` with `pulseaudiosink` and confirmed
   `/usr/local/bin/gst-launch-1.0 audiotestsrc ! pulsesink` works.
   `test-onvif` connects but again, I cannot hear any sound.

How can I trace/narrow down the problem?

Best
Stefan
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