https://bugs.kde.org/show_bug.cgi?id=447786

            Bug ID: 447786
           Summary: Composition and rotoscoping interaction issue
           Product: kdenlive
           Version: 21.12.0
          Platform: Debian stable
                OS: Linux
            Status: REPORTED
          Severity: normal
          Priority: NOR
         Component: Effects & Transitions
          Assignee: vpi...@kde.org
          Reporter: roxane.pet...@gmail.com
  Target Milestone: ---

Created attachment 145014
  --> https://bugs.kde.org/attachment.cgi?id=145014&action=edit
video recording of the issue

SUMMARY
When rotoscoping is applied to a clip that is not the full size of the project
and said clip is composed to another clip, the rotoscoping changes, it doesn't
cut the same thing anymore


STEPS TO REPRODUCE
1. Have 2 tracks, one with any clip, and the top one with a png that's not the
same size as the project (in my case 1311x1080 for a 1080p project)
2. Apply rotoscoping on the png, for example around a key feature (to noticze
the change)
3. add a composite & transform transition (but i think others work too) between
the 2 clips

OBSERVED RESULT
The rotoscoping is not cutting the key feature anymore. You can notice it by
dragging the transition away and back.

EXPECTED RESULT
Rotoscoping doesn't change

SOFTWARE/OS VERSIONS
Windows: 10
macOS: 
Linux/KDE Plasma: 
(available in About System)
KDE Plasma Version: 
KDE Frameworks Version: 
Qt Version: 

ADDITIONAL INFORMATION
tried in windows 10 and with the lastest appimage too, same issue
In the attachement, i first show the issue, then how it's supposed to be (with
a 1080p image)

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