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Hello,</div>
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Could anyone answer whether the RTSP specification has requirements about the client_port value in a SETUP response, and what the LIVE555 software behavior would be if the server responds with a different value than sent in a SETUP request?</div>
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For context, I'm investigating a video problem as a 3rd party of a 3rd party, so the feedback time for tests is large. The base problem is that an RTSP stream is not receiving video packets from a stream in a separate network, but other RTSP streams are received
and VLC can receive from the problem stream.</div>
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To illustrate the problem, consider network segments [1] and [2], and cameras [a] and [b] both in network segment [1].</div>
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<div class="elementToProof">Cameras [a] and [b] can be viewed by our client in network segment [1].</div>
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<div class="elementToProof">Camera [a] can be viewed by our client in network [2].</div>
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<div class="elementToProof">Camera [b] cannot be viewed by our client in network [2].</div>
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<div class="elementToProof">VLC can view camera [b] in network [2].</div>
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I built openRTSP and asked them to run this with the -n flag to signal packets arriving. At the time I built this, it was the most recent version: LIVE555 Streaming Media v2024.05.30.</div>
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I don't understand a lot of the RTSP communication, but what jumped out to me was that every test that showed "Data packets have begun arriving" had a matching client_port value in the SETUP response as what was requested, and every test that never showed the
"Data packets" message had a different set of values in the client_port of the SETUP response than what was requested. Viewing this same camera from the camera's network responds with the same client_port value as requested and shows the "Data packets" message.</div>
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Here's a snippet of the output from a non-working test:</div>
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Created receiver for "video/MP4V-ES" subsession (client ports 50104-50105)</div>
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Sending request: SETUP rtsp://10.10.30.7/mpeg4?cam=0/__StreamID=2161115640 RTSP/1.0</div>
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CSeq: 4</div>
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User-Agent: openRTSP (LIVE555 Streaming Media v2024.05.30)</div>
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Transport: RTP/AVP;unicast;client_port=50104-50105</div>
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Received 188 new bytes of response data.</div>
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Received a complete SETUP response:</div>
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RTSP/1.0 200 OK</div>
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Server: Mango DSP RTSP Stack</div>
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CSeq: 4</div>
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Session: 7909094312184172343</div>
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Transport: RTP/AVP;unicast;server_port=6978-6979;client_port=64712-64713;ssrc=0</div>
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x-Dynamic-Rate: 1</div>
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Setup "video/MP4V-ES" subsession (client ports 50104-50105)</div>
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Created output file: "video-MP4V-ES-1"</div>
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It looks like RTSPClient.cpp partially scans the SETUP response for the client_port=%hu value, but it only sets a flag. I'm unsure whether VLC is parsing the client_port from the SETUP response or is falling back to TCP streaming. Would it be reasonable for
LIVE555 to parse the client_port in the SETUP response and use that if the ports are different than requested?</div>
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Thank you for your attention and any insights,</div>
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Derrick N. Guerrero</div>
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