Bug 515136 - Glitched Frame when using Freeze Effect in combination with Title Clip
Summary: Glitched Frame when using Freeze Effect in combination with Title Clip
Status: NEEDSINFO WAITINGFORINFO
Alias: None
Product: kdenlive
Classification: Applications
Component: Rendering & Export (other bugs)
Version First Reported In: 25.12.1
Platform: Microsoft Windows Microsoft Windows
: NOR normal
Target Milestone: ---
Assignee: Jean-Baptiste Mardelle
URL:
Keywords:
Depends on:
Blocks:
 
Reported: 2026-01-26 22:21 UTC by BoffinBrain
Modified: 2026-01-30 08:05 UTC (History)
1 user (show)

See Also:
Latest Commit:
Version Fixed/Implemented In:
Sentry Crash Report:


Attachments
Effects panel and timeline (47.41 KB, image/png)
2026-01-26 22:21 UTC, BoffinBrain
Details
First frame of the frozen clip (looks fine) (270.20 KB, image/jpeg)
2026-01-26 22:24 UTC, BoffinBrain
Details
Second frame of the frozen clip (glitched) (110.44 KB, image/jpeg)
2026-01-26 22:24 UTC, BoffinBrain
Details

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Description BoffinBrain 2026-01-26 22:21:21 UTC
Created attachment 188935 [details]
Effects panel and timeline

SUMMARY
When using a title clip in combination with a video clip using the Freeze filter, the exported video can contain a glitched frame.

STEPS TO REPRODUCE
1. Create a new project and add a video clip.
2. Cut the clip in two and add the Freeze filter to the second half.
3. Add a Title Clip above the frozen clip and line it up to start on the same frame.
4. Export the project (or preview region containing the area where the freeze begins).

OBSERVED RESULT
The first frame of the frozen clip will look fine. However, the frame after it is glitched (video is distorted, red/green, but the title clip looks fine).

EXPECTED RESULT
All frames should look the same as they do in the project.

SOFTWARE/OS VERSIONS
Windows 10

ADDITIONAL INFORMATION
- Tested on 25.8.3 and 25.12.1.
- Tested with different video files encoded in different ways
- If the title clip does NOT start on the same frame as the frozen clip, or there is no title clip, the issue doesn't occur.
- Can provide an example project file if needed.
Comment 1 BoffinBrain 2026-01-26 22:24:09 UTC
Created attachment 188936 [details]
First frame of the frozen clip (looks fine)
Comment 2 BoffinBrain 2026-01-26 22:24:33 UTC
Created attachment 188937 [details]
Second frame of the frozen clip (glitched)
Comment 3 luzpaz 2026-01-30 08:05:25 UTC
> - Can provide an example project file if needed.

Please do. Thanks.