I'm trying to learn the use of Avisynth's Animate filter. So I start with a very simple script:
AviSource("someClip.avi")The clip is 30 fps, and I would expect it to start playing very fast (at 240 fps), but gradually slow down until t plays at only 10 fps at the end.
Animate(0, FrameCount, "AssumeFPS", 240, 10)
The fact is it plays at 240 fps form start to end.
What am I missing here?
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You want to create a VFR clip in Avisynth, but Avisynth doesn't support VFR playback...
Not without duplicating /interpolating /deleting frames, at least.Last edited by El Heggunte; 12th Dec 2020 at 03:40. Reason: clarity
"Programmers are human-shaped machines that transform alcohol into bugs." -
Thank you. I have tried
ChangeFPS(120)
Animate(0, FrameCount, "ChangeFPS", 120, 12)
but it didn't give me a pseudo-VFR either. -
Try something like this for ramping framerate: http://www.slomo.jp137.com/index-edit.html
Animate fps will cause you trouble. -
Another speed ramping avisynth method is sickjumps
http://avisynth.nl/index.php/SickJumps
example in use
https://forum.videohelp.com/threads/396086-Can-AviSynth-create-a-dynamic-title-like-iM...ie#post2574747
IMO, it's easier to do speed changes with a GUI in something like a NLE, where you can draw curves , fast visual feedback and adjust timing
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