https://bugs.kde.org/show_bug.cgi?id=427458

            Bug ID: 427458
           Summary: rotoscoping issue with Movit library
           Product: kdenlive
           Version: 20.08.1
          Platform: Ubuntu Packages
                OS: Linux
            Status: REPORTED
          Severity: normal
          Priority: NOR
         Component: Effects & Transitions
          Assignee: vpi...@kde.org
          Reporter: d2r...@126.com
  Target Milestone: ---

SUMMARY
rotoscoping issue with Movit library

STEPS TO REPRODUCE
1. Setting - Configure Kdenlive - Playback - enable GPU processing
2. after reboot, use rotoscoping to map.
3. does not work.(likely due to movit.overlay)

OBSERVED RESULT

rotoscoping does not work. However, other GPU feature working as normal.
EXPECTED RESULT
rotoscoping creates a "masking" effect, so parts of the visual in the layer
under appears in the preview, and the final video.

SOFTWARE/OS VERSIONS
Windows: N/A
macOS: N/A
Linux/KDE Plasma: Linuxfx(5.6.15-windowsfx-10-generic) based on Ubuntu
Focal(20.04LTS)
(available in About System)
Kdelive Version: 20.08.1 via Ubuntu PPA
KDE Plasma Version: 5:104ubuntu4
KDE Frameworks Version: 5.68
Qt Version: 5.12.8

ADDITIONAL INFORMATION
This issue is likely due to the movit.overlay function as converting the
project back to CPU only fixes the problem. However, this workaround often
comes with huge performance drawbacks.
SUGGESTION
1. adding a "rotoscoping(GPU)" function and make "Rotoscoping" a CPU-only
function.
2. try fixing movit.overlay implemntation?(I am not a good coder, so please
forgive me.)

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