VSE Retiming doesn't set keys correctly with framerate differences #114630
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Reference: blender/blender#114630
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System Information
Operating system: Linux-6.5.6-gentoo-x86_64-AMD_Ryzen_Threadripper_1950X_16-Core_Processor-with-glibc2.37 64 Bits, X11 UI
Graphics card: AMD Radeon RX 7900 XT (gfx1100, LLVM 16.0.6, DRM 3.54, 6.5.6-gentoo) AMD 4.6 (Core Profile) Mesa 23.2.1
Blender Version
Broken: version: 4.1.0 Alpha, branch: main, commit date: 2023-11-07 21:31, hash:
94106447950c
Worked: (newest version of Blender that worked as expected)
Short description of error
When loading in video strips there might be a difference between the framerate of the scene and the video.
If this happens and retiming keys are used, the inital start & end keys for the timing will be off.
The end frame will be too far left or right and cannot be selected.
Any operation to change the strip speed or add more retiming keys will lead to wrong retiming speeds.
In this example image I imported, extended and retimed the strip to 200%. I also selected all keys that were selectable.
Exact steps for others to reproduce the error
Ctrl R
(The start and end keys should be at the ends of the strip but are offset)R
to 200% (The values on the strip will not match up)@iss
Also moving keys and using
Right Mouse
to cancel doesn't preperly work. I keep finding more bugs. It seems the retiming operations in general are not working correctly if the frame rate doesn't match the scene.Can confirm.
Looking into this, there are bunch of issues, due to keys having position in strip space, which is then rescaled by difference of scene and movie FPS. However some checks are done in screen space and some operations in timeline space. I have to tread carefully here so I don't break it more than it is, so this will take me some time I need for testing.