No audio on screenshare after doing no-audio screenshare

[dbkr]

Steps to reproduce

1. Join call with at least 2 users
2. Start a screenshare from a source with no audio (eg. desktop window on macOS)
3. End the screenshare
4. Start screenshare with audio (eg. chrome tab on macOS)

Outcome

What did you expect?

Noise

What happened instead?

Audio from the screenshare doesn't get through

Operating system

No response

Browser information

No response

URL for webapp

No response

Will you send logs?

Yes

[robintown]

This is hypothesized to be because it reuses the screenshare transceiver that didn't have an audio track

[SimonBrandner]

This is hypothesized to be because it reuses the screenshare transceiver that didn't have an audio track

Sort of, the problem is that we re-use the video transceiver but not the audio transceiver (since we have none). This results in two transceivers with different stream IDs since the video one uses the old stream ID and the audio one uses the stream ID of the new stream.

One of the signs this is the case are the following logs:

2023-05-05T18:12:00.854Z I Call 1683308472810TfJDwFkrRdeJ3sSc pushRemoteFeed() pushed stream (streamId=57e542c3-e336-46ef-bf03-590def025ca4, active=true, purpose=m.screenshare)
2023-05-05T18:12:00.854Z I Call 1683308472810TfJDwFkrRdeJ3sSc pushRemoteFeed() pushed stream (streamId=48f7485b-dcd1-421d-a72c-e4c571b94fe6, active=true, purpose=m.screenshare)
2023-05-05T18:12:00.859Z I useMediaStream update stream mediaRef.current true stream 57e542c3-e336-46ef-bf03-590def025ca4 muted false
2023-05-05T18:12:00.868Z I useMediaStream update stream mediaRef.current true stream 57e542c3-e336-46ef-bf03-590def025ca4 muted true