https://bugs.kde.org/show_bug.cgi?id=419201

            Bug ID: 419201
           Summary: Red artifact when rendering very short title clips
           Product: kdenlive
           Version: 19.12.3
          Platform: Other
                OS: Linux
            Status: REPORTED
          Severity: normal
          Priority: NOR
         Component: Effects & Transitions
          Assignee: vpi...@kde.org
          Reporter: inflo...@netc.it
  Target Milestone: ---

SUMMARY
If the title clips are very short (only 3-4 frames long) and one of them has a
“distort” effect with animation on key frames, then when rendering, a red
screen on the finished video may occur at the junction of such clips.

SOFTWARE/OS VERSIONS
Linux: UbuntuStudio 19.10 x64
Appimage

ADDITIONAL INFORMATION
I could get rid of this artifact only by shortening the beginning of the clip
that goes right after the shortest clip.

I tried version kdenlive-19.12.0a-x86_64 but it turned out the same.

Perhaps the problem is due to the incorrect use of the "Distort" effect preset.
I noticed that the effects to which you apply the preset do not behave normally
- their regulators can become inactive after applying the preset, and then
become active again after a while. Maybe this problem is related to this.

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