https://bugs.kde.org/show_bug.cgi?id=425260
Bug ID: 425260
Summary: Interpolation is always applied on resulting video
(but not in preview)
Product: kdenlive
Version: 20.04.3
Platform: Debian unstable
OS: Linux
Status: REPORTED
Severity: normal
Priority: NOR
Component: Video Display & Export
Assignee: j...@kdenlive.org
Reporter: grzesiek.jedenas...@outlook.com
Target Milestone: ---
SUMMARY
After rendering, clips in resulting video are scaled using some kind of
interpolation (if resolution is low (eg. in pixelarts), they look very blurry).
This doesn't happen when looking at the preview though.
STEPS TO REPRODUCE
1. Get a low resolution image (for example, this pixelart:
https://i.imgur.com/0UGgh9K.png).
2. Create a new Kdenlive project (I used 1280x720 resolution, it shouldn't
matter as long as it's bigger than images resolution).
3. Add this image as a clip.
4. Insert it into the timeline.
5. Check out the preview (here is mine: https://i.imgur.com/bmKvJ2s.png).
6. Render the project (I used H264/AAC renderer, but it shouldn't matter).
7. Check out the result (here is mine: https://youtu.be/f6bNdG30_Do).
OBSERVED RESULT
Preview shows sharp image, without interpolation.
Rendered video shows blurry image, with interpolation.
EXPECTED RESULT
Preview shows sharp image, without interpolation.
Rendered video shows sharp image, without interpolation.
SOFTWARE/OS VERSIONS
Operating System: Debian GNU/Linux
KDE Plasma Version: 5.17.5
KDE Frameworks Version: 5.70.0
Qt Version: 5.14.2
Kernel Version: 5.7.0-8.3-liquorix-amd64
OS Type: 64-bit
Processors: 4 × Intel® Core™ i5-2400 CPU @ 3.10GHz
Memory: 7,7 GiB
ADDITIONAL INFORMATION
I suggest adding an option to disable or enable interpolation in clip
preferences, like in GIMP for example. Preview also needs to be fixed to
display right interpolation.
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