https://bugs.kde.org/show_bug.cgi?id=443250
Bug ID: 443250
Summary: Incorrect scaling behaviour of pre-rendered 4K objects
Product: kdenlive
Version: 21.08.1
Platform: Microsoft Windows
OS: Microsoft Windows
Status: REPORTED
Severity: major
Priority: NOR
Component: Video Display & Export
Assignee: j...@kdenlive.org
Reporter: kdenl...@shepperton.org
Target Milestone: ---
Created attachment 142114
--> https://bugs.kde.org/attachment.cgi?id=142114&action=edit
Comparative images of correct & incorrect behaviour
SUMMARY
Preview rendering does not scale correctly for 4K footage on a 4K VDU,
magnifying the content for the previewed segment (within the 'green bar'
region) then jumping back to normal (correct) scaling outside the preview
rendered region.
STEPS TO REPRODUCE
1. In a 4K project on a 4K VDU (on Windows 10) place some material on the
material on the timeline.
2. Using the drop down menu next to to the 'Preview rendering' button above the
timeline, make sure 'Automatic preview' is off and click on 'Remove all preview
zones'.
3. Play out the timeline - it should play out correctly and be scaled
correctly.
4. Now go back and set 'Add 'Preview render zone' then set 'Automatic preview'
on.
5. This should set part of the timeline to a render zone which should turn the
render progress line from red to green when it's done
OBSERVED RESULT
Play out the timeline - on my machine the xegment that is pre-dendered, and
only the segment that is pre-rendered, will ge scaled incorrectly, seeming to
be magnified or scaled up incorrectly.
EXPECTED RESULT
Obviously, this simply shouldn't happen.
SOFTWARE/OS VERSIONS
Windows: 10 Home
OS build: 19043.1237
kdenlive: v21.08.1, default installation (portable)
ADDITIONAL INFORMATION
Clearing caches etc, does not solve the issue.
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