https://bugs.kde.org/show_bug.cgi?id=486081
Bug ID: 486081
Summary: Frame swapping in WebRTC screensharing while moving
the mouse
Classification: Plasma
Product: kwin
Version: 6.0.4
Platform: Arch Linux
OS: Linux
Status: REPORTED
Severity: normal
Priority: NOR
Component: wayland-generic
Assignee: kwin-bugs-n...@kde.org
Reporter: t...@nitrosubs.live
Target Milestone: ---
SUMMARY
Screensharing using browsers (Firefox, Chromium, as well as things like
Electron) / WebRTC swaps frames on the stream when mouse movement is performed.
However, OBS Studio and Spectacle work fine regardless if the pointer is being
moved or not.
STEPS TO REPRODUCE
1. Go to a website like
https://webrtc.github.io/samples/src/content/getusermedia/getdisplaymedia and
share the entire desktop
2. Open an app that constantly updates in the background (like vkcube or
VRRTest)
3. Look at the browser preview and move the cursor around
OBSERVED RESULT
The preview in the browser has weird frame pacing issues
EXPECTED RESULT
The preview in the browser displays frames in proper order, just like OBS and
Spectacle do
SOFTWARE/OS VERSIONS
Operating System: Arch Linux
KDE Plasma Version: 6.0.4
KDE Frameworks Version: 6.1.0
Qt Version: 6.7.0
Kernel Version: 6.8.4 (64-bit)
Graphics Platform: Wayland
Graphics Processor: AMD Radeon RX 6600 XT
ADDITIONAL INFORMATION
KWin 6.0.2 does not have this issue, this seems to be a regression in 6.0.3 or
6.0.4.
Additionally, if by any chance the cursor does not get shown in the preview
after screencasting is turned on (happened to me once), it seems to work fine
too.
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