Dear Maintainer,

for some weeks I am unable to use screen sharing in video conferences
using MS Teams. This applies to Firefox, Chrome and the MS Teams PWA.

Screen sharing used to work fine for several months before. I am not
aware of any relevant changes to the system I could have made.

In order to get some insights I started Google Chrome in a terminal to
see some output. Below is the output that is produced when I start
Chrome, visit teams.microsoft.com, start a test call, and try to do
screen sharing.

In the application the error message I see is that "Chrome is unable to
access camera."

I tried to do screen sharing with Firefox and Jitsi which seemed to
work. I also tried to start an KDE-X11 session, which did not help. The
problem exists regardless of whether I use the laptops monitor or an
external one.

My system has set the environment variables WAYLAND_DISPLAY to wayland-0
and XDG_CURRENT_DESKTOP to KDE. The packages xdg-desktop-portal, -gtk
and -kde are installed.

I am reporting the bug to pipewire due to the error message above. If
another package is more suitable, I would appreciate if you could let me
know, so I could report the bug there.

I came across some user reports regarding Arch Linux [1], in which people
describe experiences very similar to my own. It is said that using Firefox
Beta resolves the issues.

I am also able to share my screen using Firefox Beta again. However, the line

     'loop->recurse > 0' failed at ../src/pipewire/thread-loop.c:425 pw_thread_loop_wait()

still appears when using Firefox Beta. I am not sure if this line indicates a
bug anyway, but it does not seem to be the only cause.

1: https://bbs.archlinux.org/viewtopic.php?id=305299