https://bugs.kde.org/show_bug.cgi?id=432623
Bug ID: 432623
Summary: 1hr+ clip imported in will have "high pitch, speed up"
nonsense and laggy video midway through on the
timeline and beyond
Product: kdenlive
Version: 20.12.0
Platform: Microsoft Windows
OS: Microsoft Windows
Status: REPORTED
Severity: major
Priority: NOR
Component: Video Display & Export
Assignee: j...@kdenlive.org
Reporter: a...@delposen.com
Target Milestone: ---
SUMMARY
Title says it all. A new project, with an imported clip (mkv) that's 45 mins to
an hour long successfully gets imported. Once clip is dragged into timeline and
is being watched from beginning to roughly 10+ min mark, video preview becomes
extremely laggy and audio becomes squirrely/high pitch. Manually moving forward
into the timeline results in same issue. Manually moving back before 10+ min
mark, results in normal operations until timeline hits that 10+ min mark. I
have done "stupid checks" such as, yes the file itself isn't broken, can watch
it normally on any media player.
STEPS TO REPRODUCE
1. New, blank project upon opening
2. Import a mkv clip/file that's roughly an hour (45 - 1:15 mins)
3. Let the "job" process
4. Drag and drop clip into the timeline
5. Start watching clip from timeline from the beginning through the preview
(which is set to 720p. Base clip was 1080p)
6. At some, inconsistent time point (generally 10+ mins into watching) the
audio and video becomes buggy.
OBSERVED RESULT
- Audio is high pitch, squirrely and incomprehensible.
- video preview is laggy frames, not aligned with actual video file
EXPECTED RESULT
- Video and audio to continue to preview as normal
SOFTWARE/OS VERSIONS
Windows: Windows 10 Education OS build 19042.789
ADDITIONAL INFORMATION
7. Manually skipping forward will result in still messed up audio and video. I
have a guess it's actually a looping audio and video from where the issue
started, no matter how far forward you go
8. Manually clicking BEFORE the 10 min mark will result in normal operations.
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