webrtcbin does not emit pad-added signal

[Alexei Golovko]

I try to connect webrtcbin to Janus with gstreamer 1.20.1 and python 3.9,
but does not receive pad-added signal.

The code is in
https://gist.github.com/le-chat/d74457383b6e821666b90e8d5cebcd38#file-webrtc_receiver-py
This gist provides full self-contained environment (with Nix or Docker) and
starts Janus server, virtual RTSP camera (used as video source for Janus)
and webrtcbin-based client which tries to connect.

The handler for pad-added is never called, and I don't understand why.

The logs are at https://pastebin.com/raw/RsyKBAfM
As i can see, webrtcbin establishes connection and receives many RTP
packets from Janus.

Regards, Alexei Golovko.
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