Bug 429880

Summary: Crop/Pan causes blurriness
Product: [Applications] kdenlive Reporter: dawson.michael
Component: Video Effects & TransitionsAssignee: Vincent PINON <vpinon>
Status: RESOLVED WORKSFORME    
Severity: normal CC: snd.noise
Priority: NOR    
Version First Reported In: 20.08.2   
Target Milestone: ---   
Platform: Microsoft Windows   
OS: Microsoft Windows   
Latest Commit: Version Fixed/Implemented In:
Sentry Crash Report:

Description dawson.michael 2020-12-01 09:33:56 UTC 
SUMMARY
Using crop ([Edge Crop]/[Crop/Scale/Tilt]) and/or a Position Effect ([Transform]/[Position and Zoom] causes blurriness even without scaling.

STEPS TO REPRODUCE
1. Add a cropping effect (eg crop a single portrait from a zoom meeting)
2. Add an effect to move the cropped video

OBSERVED RESULT
The cropped video is blurry. The blur is added by both effects. The crop will blur depending on the aspect ratio, and the position effect will just add a blur like it was shrunk to 25% then regrown with a bad scaling algorithm.

EXPECTED RESULT
I expect no change in quality if I do not warp the video.

SOFTWARE/OS VERSIONS
Windows: Windows 10 (Fully Updated)
Version 20.08.2
KDE Frameworks 5.74.0
Qt 5.15.1 (built against 5.15.1)
The windows windowing system
Comment 1 farid 2021-04-06 13:13:56 UTC 
can you please try latest version and see if you can reproduce? I can't reproduce...
Comment 2 dawson.michael 2021-04-07 03:05:47 UTC 
Doesn't seem to affect current version.