[kdenlive] [Bug 469905] New: The blur effect works properly on the preview but is applied wrong on the export.

[Ademar Oliveira]

https://bugs.kde.org/show_bug.cgi?id=469905

            Bug ID: 469905
           Summary: The blur effect works properly on the preview but is
                    applied wrong on the export.
    Classification: Applications
           Product: kdenlive
           Version: 23.04.1
          Platform: macOS (DMG)
                OS: macOS
            Status: REPORTED
          Severity: normal
          Priority: NOR
         Component: Video Display & Export
          Assignee: jb at kdenlive.org
          Reporter: ademar111190 at gmail.com
  Target Milestone: ---

Created attachment 159039
  --> https://bugs.kde.org/attachment.cgi?id=159039&action=edit
the four files

SUMMARY

I create a rectangle to blur a video piece, which works as expected in the
preview but applies differently when rendering to a file.

STEPS TO REPRODUCE
1. Duplicate the video track
2. At the upper track, adds "Alpha shapes (mask)"
3. Create any rectangle you want
4. At the upper track, adds "Gaussian blur"
5. set sigma to 20

OBSERVED RESULT
The preview blurs the rectangle, but the rendered file doesn't.

EXPECTED RESULT
Both should apply the effect in the same way.

SOFTWARE/OS VERSIONS
macOS: 12.6.5

ADDITIONAL INFORMATION

In the attachment, I'm adding a zip file containing the following:
- A record of kdenlive preview where you can see the effect working as intended
- The rendered file where you can see the effect is present, but in a much
different way
- The original video without effect and the .kdenlive project file in case you
want to reproduce it.

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