https://bugs.kde.org/show_bug.cgi?id=501985

            Bug ID: 501985
           Summary: Unexpected behavior during video transition
    Classification: Applications
           Product: kdenlive
           Version: 24.12.3
          Platform: Kubuntu
                OS: Linux
            Status: REPORTED
          Severity: normal
          Priority: NOR
         Component: Video Effects & Transitions
          Assignee: j...@kdenlive.org
          Reporter: g...@pobox.com
  Target Milestone: ---

Created attachment 179726
  --> https://bugs.kde.org/attachment.cgi?id=179726&action=edit
During transition

1. Create 2 video clips in V2 and V1
2. Add Transform effects to the V1 clip
3. Overlap the 2 clips so V2 transitions to V1, and add a dissolve transition

OBSERVED RESULT
In some  - but not all - cases, instead of the expected transition, V1 appears
immediately, with a small overlay window in the top left corner of the preview
panel showing a replica of the V2 clip that gradually fades out through the
transition. Note that this appears to only happen when one of the clips has
Transform effects and the other does not.

EXPECTED RESULT
A smooth transition

SOFTWARE/OS VERSIONS
Kubuntu Linux 24.10 
KDE Plasma Version: 6.1.5
KDE Frameworks Version: 6.6.0
Qt Version: 6.6.2
Kdenlive: Flatpak Version 24.12.3

ADDITIONAL INFORMATION
The two clips are both 4k video captured on an Android smartphone. The project
is set to HD720, 30fps.
The computer is an AMD Ryzen 9 5900X with 32GB RAM
Graphics: MSI GeForce RTX 3050 LP 6G OC (6GB GDDR6/PCI Express)
Drivers for Nvidia

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