https://bugs.kde.org/show_bug.cgi?id=431679
Bug ID: 431679
Summary: Transition between keyframes on effects on titles is
calculated correctly, but rendered with wrong timing
(tested with Position and Zoom)
Product: kdenlive
Version: 20.12.1
Platform: Archlinux Packages
OS: Linux
Status: REPORTED
Severity: normal
Priority: NOR
Component: Effects & Transitions
Assignee: vpi...@kde.org
Reporter: m...@stefannaumann.de
Target Milestone: ---
SUMMARY
I applied the Position and Zoom-effect to a title, and added a keyframe
somewhere in the start and in the end. I've set the size to something big at
the later keyframe. The transition between the states occurs rapidly, over the
time of a few seconds, rather than slowly, linearly over the whole duration of
the keyframe-interval. KDEnlive shows the calculated values in the boxes -
these seem correct, but the preview-renderer in the App and the rendered video
both have totally wrong timing and apply the effect way to fast (I assume,
there is a hardcoded value somewhere).
This also occurs with the rotate (keyframeable) effect. The first keyframe is
recognized correctly, but it seems the interval is either calculated wrongly or
hardcoded to like 3-4 seconds?
STEPS TO REPRODUCE
1. Create a title (a video clip seems to work fine), stretch it out over like
20 seconds
2. Apply Position and Zoom, create two keyframes, modify the values of the
latter; place them some 10s or so apart
3. watch the preview render
OBSERVED RESULT
Effect is applied right after the first keyframe
EXPECTED RESULT
Effect should be evenly applied in the whole interval between the two keyframes
SOFTWARE/OS VERSIONS
Linux-Kernel: 5.4.81-lts
MLT version: 6.24.0
KDE Frameworks Version: 5.77.0
Qt Version: 5.15.2
ADDITIONAL INFORMATION
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