[dolphin] [Bug 501552] New: Video thumbnails are broken

[Guillaume]

https://bugs.kde.org/show_bug.cgi?id=501552

            Bug ID: 501552
           Summary: Video thumbnails are broken
    Classification: Applications
           Product: dolphin
           Version: unspecified
          Platform: Other
                OS: Linux
            Status: REPORTED
          Severity: normal
          Priority: NOR
         Component: panels: folders
          Assignee: dolphin-bugs-null at kde.org
          Reporter: pinchon.guillaume at gmail.com
                CC: kfm-devel at kde.org
  Target Milestone: ---

SUMMARY
When viewing video files in Dolphin, thumbnails are broken. Tested with
OpenSUSE SlowRoll and Fedora 41. The Flatpak version works (but seems
abandonned) if that helps... When running Dolphin through the console, I get
the following errors when hovering over a video file.
> [swscaler @ 0x557cca67cf40] bad src image pointers
> kf.kio.core.connection: Socket not connected QLocalSocket::PeerClosedError
> kf.kio.core: An error occurred during write. The worker terminates now.
> QThreadStorage: Thread 0x557cc9564010 exited after QThreadStorage 2 destroyed
> QThreadStorage: Thread 0x557cc9564010 exited after QThreadStorage 1 destroyed

STEPS TO REPRODUCE
1. Open Dolphin
2. Navigate to a folder containing video files

OBSERVED RESULT
When hovering over video files the thumbnails are scrambled. Side panel video
preview is blank.

EXPECTED RESULT
Video thumbnails should be displayed and cycle through video preview when
hovered. The side panel should allow to play the video preview.

SOFTWARE/OS VERSIONS
Operating System: Fedora Linux 41
KDE Plasma Version: 6.3.3
KDE Frameworks Version: 6.12.0
Qt Version: 6.8.2
Kernel Version: 6.13.6-200.fc41.x86_64 (64-bit)
Graphics Platform: Wayland
Processors: 16 × AMD Ryzen 7 7840HS with Radeon 780M Graphics
Memory: 27.1 Gio of RAM
Graphics Processor: AMD Radeon 780M
Manufacturer: LENOVO
Product Name: 82Y8
System Version: Yoga Pro 7 14APH8

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