https://bugs.kde.org/show_bug.cgi?id=515212
Bug ID: 515212
Summary: Panel keeps appearing on top of fullscreen mpv
Classification: Plasma
Product: plasmashell
Version First 6.5.5
Reported In:
Platform: Arch Linux
OS: Linux
Status: REPORTED
Severity: minor
Priority: NOR
Component: Panel
Assignee: [email protected]
Reporter: [email protected]
CC: [email protected]
Target Milestone: 1.0
SUMMARY
When playing a fullscreen video in mpv, the plasma panel sometimes appears on
top of the video for a frame or 2. This only happens with 24 (23.98) fps video,
when I have my monitor set to 165 (164.80) Hz. When using 144 Hz, the ratio of
refresh rate to video framerate is a nice integer. With 165 Hz that is not the
case. I've tried different video-sync and interpolation options in mpv, but
they only make it worse. video-sync=display-resample is the best one, but it
still happens with that one as well. Looking at the mpv stats overlay, mpv
delays a frame every time the panel appears (or the panel appears every time
mpv delays a frame, not sure which one causes which).
STEPS TO REPRODUCE
1. Set monitor refresh rate to 165 Hz
2. Play a 24fps video in mpv
OBSERVED RESULT
Panel keeps flickering on top of the video
EXPECTED RESULT
Panel does not do that
SOFTWARE/OS VERSIONS
Linux: Arch Linux 6.18.6-zen1-1-zen (64-bit)
KDE Plasma Version: 6.5.5
KDE Frameworks Version: 6.22.0
Qt Version: 6.10.1
Wayland
AMD
ADDITIONAL INFORMATION
The 2 workarounds I have found are setting your refresh rate to 144, or making
a window rule for mpv to force it to stay on top of other windows.
This does not happen with 60fps video, even though the ratio of frames to
refresh rate is not an integer in that case.
Not sure if adaptive sync affects this, but I tried with it off and the result
is the same. Also tried allowing tearing in fullscreen windows.
This did not happen on an older version of Plasma but I'm not sure which one it
was because I don't update my system as often as I probably should.
Not sure if this is an mpv bug or a KDE bug, but it feels like a KDE bug to me,
considering it's only the panel that does that.
Visually very similar to, (if not the same as) this bug
https://bugs.kde.org/show_bug.cgi?id=474488
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