https://bugs.kde.org/show_bug.cgi?id=479291

            Bug ID: 479291
           Summary: Dance does not work with most FFT window sizes
    Classification: Applications
           Product: kdenlive
           Version: 23.08.4
          Platform: Microsoft Windows
                OS: Microsoft Windows
            Status: REPORTED
          Severity: minor
          Priority: NOR
         Component: Effects & Transitions
          Assignee: j...@kdenlive.org
          Reporter: 6vv15l...@mozmail.com
  Target Milestone: ---

SUMMARY
The window size for the dance effect can be moved within a reasonable range.
However, for sizes other than 1024 or 2048 (maybe others), the effect will not
appear on the final result, and reloading the project will cause a notification
"unable to initialize fft" when opening the master effects tab.

STEPS TO REPRODUCE
1. Add the dance effect on the master.
2. Set the window size to e.g. 640
3. Save and reload the project.

OBSERVED RESULT
The effect no longer shows on the preview or the render. A notification "unable
to initialize fft" is shown on the effects tab.

EXPECTED RESULT
The effect works as usual, such as when choosing the default window size of
2048.

SOFTWARE/OS VERSIONS
Windows 11

ADDITIONAL INFORMATION

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