webrtcsink : sample fails with "Unknown message from server: {"type":"welcome", "peerId":"836..."}

[Mathieu Duponchelle]

Hey,

Protocol mismatch, refer to
https://gitlab.freedesktop.org/gstreamer/gst-plugins-rs/-/issues/454
for a duplicate :)

Best,
Mathieu
On Mon, 2023-11-13 at 00:53 +0100, Vincent Deconinck via gstreamer-
devel wrote:
> Hi,
> 
> Context: Gstreamer newbie here. I'm trying to use a pipeline to send
> an A/V stream to a browser using WebRTC. The streamer, signalling
> server and browser client will all be on the same private network.
> The following tests were performed on Windows 10.
> 
> What I've tried: I had success in building and using the basic
> webrtcbin sample but as I need a full fledged system (incl.
> signalling etc.), it seems webrtcsink is the way to go, so I'm now
> trying to use it.
> I followed the README at
> https://gitlab.freedesktop.org/gstreamer/gst-plugins-rs/-/blob/main/net/webrtc/README.md
> The code is built, the signalling server runs and the GstWebRTC API
> runs in the browser.
> 
> Problem: The command to launch the pipeline (gst-launch-1.0
> webrtcsink name=ws meta="meta,name=gst-stream" videotestsrc ! ws.
> audiotestsrc ! ws.) fails with:
> 
> ERROR: from element /GstPipeline:pipeline0/GstWebRTCSink:ws:
> GStreamer encountered a general stream error.
> Additional debug info:
> net\webrtc\src\webrtcsink\imp.rs(1404): gstrswebrtc::webrtcsink::imp
> (): /GstPipeline:pipeline0/GstWebRTCSink:ws:
> Signalling error: Unknown message from server:
> {"type":"welcome","peerId":"8365d5c1-a2c8-4a1b-a9b0-96c0dfe12060"}
> 
> Question: Any idea what the reason could be ? What can I try to
> understand what is going on ?
> 
> Any help would be greatly appreciated
> 
> Vincent
> 
> PS: I was amazed at the quality of the gstreamer documentation, and
> in particular the tutorials. I have never seen explanations of such
> quality for an open-source project.
> Kudos to the contributors !