In Video Room, one participant can't be heard by the others #3176
Description
Steps to reproduce
I was told to open this ticket on an issue I reported to the #webrtc matrix room.
We've got a video room, created at about the time when the Jitsi → Element Call migration happened. We used the room for months without serious problems. Until recently:
In that room, there were 3 participants in an actual call on 2025-04-07 from 18:20 to 18:22 UTC:
- A, on Element X (Android) 25.03.4
- B, on Element Desktop (Linux) 1.11.96 – affected?
- C, on Element Desktop (Windows) 1.11.96
Participant B could not be heard by the others. Participants A and C could be heard by all others, including B.
And here is the kicker: I invited the same participants into a fresh (non-video) private room and started a call there, and it worked without hitches for 4 hours until we called it a day.
This issue is reproducible, we had it on multiple days and on different LiveKit SFUs (including matrix.org's). It happens with 2 or 3 participants. However, it only started a couple days ago. We were using that video room for months without serious issues, and also with the (now) affected participant. The issue started at around the time when Element Call was embedded into Element.
I told everyone to check for latest versions of clients. And at least from participant C I got confirmation he was running 1.11.96 (latest).
We never checked video, we're only using audio. The avatar image that is replacing the video was in general only showing a capital letter, despite us all having set up an image. I was told on #webrtc that this is a known limitation. **However, the avatar image of affected participant B was behaving strange, it was only shown as a "B&W YouTube" icon (see screenshot below) for quite a while before it finally was shown as a capital letter.
I will try to provide as many logs as I can.
Outcome
see above
Operating system
No response
Browser information
No response
URL for webapp
No response
Will you send logs?
Yes