https://bugs.kde.org/show_bug.cgi?id=507630
Bug ID: 507630
Summary: [Perf] Viewport animation on Title Clip with large
amounts of text extremely slow to play and render
Classification: Applications
Product: kdenlive
Version First 25.07.90
Reported In:
Platform: macOS (DMG)
OS: macOS
Status: REPORTED
Severity: normal
Priority: NOR
Component: Title Clips & Subtitles
Assignee: j...@kdenlive.org
Reporter: r...@racitup.com
Target Milestone: ---
SUMMARY
Using large amounts of text with the viewport animation for scrolling text
causes performance issue. Rendering is extremely slow. On a recent project
render fell to 0fps (1000 frames in 4 hours)
STEPS TO REPRODUCE
1. New Project
2. Add an image to a video track for 20 sec
3. Add a Title Clip to another video track overlapping the image for 10sec with
the following settings:
- One A4 side of text (300 words)
- Font: phosphate, size 42, colour solid black
- Outline: 13 white
- Viewport animation: top to bottom
4. Try playback or render - extremely slow.
OBSERVED RESULT
Extremely slow - with animation
Normal - without animation
EXPECTED RESULT
Normal both times
SOFTWARE/OS VERSIONS
macOS: 12.7.6
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