Jitsi-meet: Quality for screensharing + camera is bad

[puckipedia]

Description:

For some people with low-resolution webcams, screensharing is high-resolution, but the moment that someone toggles their webcam, the resolution of the combined stream turns unreadable.

Steps to reproduce:

1. Enable the webcam, see a low quality image
2. Start screensharing, see that the resolution is good
3. Enable the webcam while screensharing, and see that the resolution is bad.

Expected behavior:

The resolution of the whole screenshare is not bad.

Actual behavior:

The resolution of the whole screenshare is bad.

Server information:

• Jitsi Meet version: 1.0.4127
• Operating System: NixOS

Client information:

• Browser / app version: Firefox various, e.g. 78
• Operating System: NixOS

Additional information:

[paweldomas]

can you try with the latest version? there was recently a change which should make screenshare in the presenter mode more readable: https://github.com/jitsi/jitsi-meet/pull/7836

[jallamsetty1]

Does this happen only on Firefox or are you able to reproduce this on Chromium as well ?

[amsnek]

i am not the person in question, but i observed the same behaviour (screenshare + presenter mode reduced screenshare quality)
-> this is fixed for me in latest release (2.0.5142) as far as i can tell.

[jallamsetty1]

The firefox issue should have been resolved on meet.jit.si now. It will be available in the stable builds once the version running meet.jit.si gets pushed there. I am closing the issue, please feel free to re-open if you still see the issue.

[neehalsaal]

Hi @jallamsetty1,
Sorry to be commenting over a closed issue.
I just checked this on meet.jit.si and found that the screen share quality wasn't good.

This happens only when someone is doing a screen share with their camera ON from firefox (v83.0, this is what I tried on)
The recipient's browser didnt matter. I am using chrome v86.0.4240.111 here.

Thank you

[jallamsetty1]

Hi @jallamsetty1,
Sorry to be commenting over a closed issue.
I just checked this on meet.jit.si and found that the screen share quality wasn't good.

This happens only when someone is doing a screen share with their camera ON from firefox (v83.0, this is what I tried on)
The recipient's browser didnt matter. I am using chrome v86.0.4240.111 here.

Thank you

We have a limitation on Firefox with presenter because FF doesn't report the width/height of desktop tracks. So we have to resize a given desktop track to 720p to be able to create a composite video stream that includes the desktop and camera. If the screen you have chosen to share is of much higher resolution, then FF doesn't do a good job when it gives us a resized stream of 720p. Unfortunately we cannot do anything about it for now. Can you try with a low resolution screen and check if you see the same issue ? Also please give the browser about a min to adjust the upload bitrate .