https://bugs.kde.org/show_bug.cgi?id=453881
Bug ID: 453881
Summary: Time Remap : Gradually change speed between keyframes
(speed ramp)
Product: kdenlive
Version: 22.04.1
Platform: Ubuntu Packages
OS: Linux
Status: REPORTED
Severity: normal
Priority: NOR
Component: Effects & Transitions
Assignee: vpi...@kde.org
Reporter: hee...@gmail.com
Target Milestone: ---
SUMMARY
The Time Remap feature cannot be used to make a speed ramp effect, which is for
me the ability to gradually change speed between two keyframes.
STEPS TO REPRODUCE
1. Create a keyframe with speed=100%
2. Later in the clip, create another keyframe with speed=200%
OBSERVED RESULT
When the first keyframe 100% is hit, the playback speed goes instantaneously to
200%.
When the second keyframe 200% is hit, the playback speed goes instantaneously
to 100%.
EXPECTED RESULT
The playback speed should increase gradually between the two keyframes : speed
should be 150% between the two keyframes. Ideally, this should be controlled
with bezier curves...
Ok to be fair, the first keyframe is actually [speed before=100% ; speed
after=200%] and the second keyframe is [speed before=200% ; speed after=100%]
so the observed result makes sense. But I think everybody would expect a "ramp"
effect here. Even the documentation is mentioning speed ramp :
https://docs.kdenlive.org/en/effects_and_compositions/effects.html#time-remapping-speed-ramps.
SOFTWARE/OS VERSIONS
Linux: Kubuntu 22.04
KDE Plasma Version: 5.24.4
KDE Frameworks Version: 5.92.0
Qt Version: 5.15.3
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