https://bugs.kde.org/show_bug.cgi?id=485727

            Bug ID: 485727
           Summary: Video playback broken in X11 session
    Classification: Applications
           Product: gwenview
           Version: 24.02.2
          Platform: Arch Linux
                OS: Linux
            Status: REPORTED
          Severity: normal
          Priority: NOR
         Component: general
          Assignee: gwenview-bugs-n...@kde.org
          Reporter: tn...@physik.tu-berlin.de
  Target Milestone: ---

SUMMARY
Playback of any video files within Gwenview is broken in X11 session since
transition to KF6 / Plasma 6. Sound is playing correctly, time in progress bar
is advancing, but playback window is black (only background color, no video).
Video thumbnails are shown correctly in file browser. Pictures are also shown
correctly.
Video playback works as expected in Wayland session.

STEPS TO REPRODUCE
1. Open Gwenview from within X11 session
2. Select any supported video file for playback

OBSERVED RESULT
Black screen (background color) where video should be visible, audio works

EXPECTED RESULT
Video and audio should be working.

SOFTWARE/OS VERSIONS

Linux/KDE Plasma: Arch Linux, Kernel 6.8.5-arch1
KDE Plasma Version: 6.0.4
KDE Frameworks Version: 6.1.0
Qt Version:  6.7.0
NVidia driver version: 550.67

ADDITIONAL INFORMATION
phonon-vlc and phonon-gstreamer have been used as backends, no difference.
Gwenview 23.08.5 (from Plasma 5) works.

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