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

[Vincent Deconinck]

 Hi,
Thanks for the quick response. Gosh, that was the issue indeed.
I had searched the web for "Signalling error: Unknown message from server"
but the gitlab issue only had it... in a png screenshot. How come Google
did not OCR it ? ;-)
Artifacts are purged after one week so the link to the "nightly" build is
outdated but I had no trouble finding a more recent build, and it worked
right of the box.
Merci bcp Mathieu :-)
Vincent

On Mon, Nov 13, 2023 at 4:40 PM Mathieu Duponchelle <mathieu at centricular.com>
wrote:

> 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 !
>
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