Created attachment 133851 [details] screenshot 2 portals SUMMARY Two portal shows up to select the monitor I want to mirror. It also fails to mirror the monitor. STEPS TO REPRODUCE 1. Install lateste google chrome stable 2. Goto https://www.webrtc-experiment.com/Pluginfree-Screen-Sharing/#5546995835292057 3. Click on "Share your screen" OBSERVED RESULT Two portals shows up. When I chose the monitor I want to share on the portals, only a black screen shows on the website. My desktop is NOT mirrored. EXPECTED RESULT Only one portal opens and I can select my screen to share, the opened website should show a mirror of my desktop. SOFTWARE/OS VERSIONS Operating System: Arch Linux KDE Plasma Version: 5.20.4 KDE Frameworks Version: 5.76.0 Qt Version: 5.15.2 Kernel Version: 5.9.11-arch2-1 OS Type: 64-bit Processors: 12 × AMD Ryzen 5 5600X 6-Core Processor Memory: 15.6 GiB of RAM Graphics Processor: Radeon RX 570 Series ADDITIONAL INFORMATION Packages installed: xdg-desktop-portal 1.8.0-1 xdg-desktop-portal-kde 5.20.4-1 google-chrome 87.0.4280.88-1 libpipewire02 0.2.7-1 Somebody else who also have this issue (https://gitlab.freedesktop.org/pipewire/pipewire/-/issues/380), tried it with GNOME (Wayland) and it is working, see: https://gitlab.freedesktop.org/pipewire/pipewire/-/issues/380#note_716112 pipewire 0.3.17
Created attachment 133852 [details] screenshot from another user
I think this is broken in Chromium. Originally with Plasma 5.19, we were using BGRx format and I implemented WebRTC using it as well, however with Plasma 5.20 and things moving to KWin, it can now also be BGRA (with alpha channel) and that will not be handled in WebRTC. This is already fixed upstream: https://webrtc-review.googlesource.com/c/src/+/194100 @apol: I wonder whether we can (or if we want) to workaround on our end. Basically we can set stream format to be either BGRA or BGR based on what we settle on with the client and then take that into account? You can ignore two portals showing up, that's something we will have to deal with in Chromium. It is painful, but for now you have to confirm both dialogs.
Black screen fixed in KWin: https://invent.kde.org/plasma/kwin/-/merge_requests/526 Double portal will be fixed in Chromium: https://chromium-review.googlesource.com/c/chromium/src/+/2578840