[Live-devel] ffprobe over UDP gets 461 from testOnDemandRTSPServer (2026.10.29)

[Paul Westlund]

Forgot to attach the zip.

Paul Westlund
Software Lead | Current Scientific Corporation
paul.westlund at currentcorp.com<mailto:paul.westlund at currentcorp.com>
www.currentcorp.com<http://www.currentcorp.com/>
________________________________
From: Paul Westlund <paul.westlund at currentcorp.com>
Sent: Wednesday, November 4, 2026 7:55 AM
To: live-devel at lists.live555.com <live-devel at lists.live555.com>
Subject: ffprobe over UDP gets 461 from testOnDemandRTSPServer (2026.10.29)

Hello,

I can't get ffmpeg to stream over UDP from a default build of 2026.10.29. I built live555 as it comes (genMakefiles linux-64bit, then make), ran testProgs/testOnDemandRTSPServer with a test.264 next to it, and then ran:

ffprobe -rtsp_transport udp rtsp://127.0.0.1:8554/h264ESVideoTest

The SETUP gets "461 Unsupported Transport". Without -rtsp_transport udp, ffmpeg falls back to TCP and plays fine.

ffmpeg asks for "RTP/AVP/UDP" in its Transport header, and the same SETUP with "RTP/AVP" instead is accepted, so it seems to be the "/UDP" that's rejected. I may be missing something, though.

The attached zip has a script that runs these steps from scratch, and its output (ffmpeg 6.1.1, Ubuntu 24.04).

Thanks,

Paul Westlund
Software Lead | Current Scientific Corporation
paul.westlund at currentcorp.com<mailto:paul.westlund at currentcorp.com>
www.currentcorp.com<http://www.currentcorp.com/>
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