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timewarp is jerky and stutters
Am I missing something? I apply Timewarp to a clip and this wonderous slo mo plugin that should make everything smooth actually makes everything jerky and stuttered.
The clip is of a wave breaking and I want to run it at 50%. I apply Timewarp, leave it at the default 50%, and render. The result is the wave jitters. It starts to curl in slo mo, then pauses for a brief frame or two, then moves, then pauses, then moves. That’s the rendered version.
I’m not sure if the answer lies in the Timewarp settings or in the Interpret Footage dialog. Because there’s some defaults in there that make me wonder. The clip is a 29.97 interlaced video file from a 90s era camera. But the interpret footage dialog seems to be performing a pulldown at wssww with an effective framerate of 23.XX. This seems off. But if I set the pulldown to off, the resolution of the video on screen looks horrible… like it’s deinterlacing and loosing have the resolution.
Are these two things unrelated?
Does anyone know how to make Timewarp be smooth?
Thanks to all for the help!
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3 Replies
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you might check your capture settings and make sure they jive with your footage.
but, assuming you have the footage captured correctly, it’s not that uncommon for ae to misinterpret footage. set the interpret footage setting to the correct frames rate (29.97) and proper field dominace (probably lower, but this can vary) and see how that looks.
also, in your situtation, you can try not using timewarp and compare the results… since your are slowing 50%, you can set your interpret footage settings to separate fields (test with preserve edges on), but set the framerate to half of the final framerate (14.985, i think). now put that into a 29.97 comp, and you should have slowed your footage by half. try enabling frame blending and you sould get good results.
Kevin Camp
Designer – KCPQ, KMYQ & KRCW -
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For the sake of Google, this can be one reason for Timewarp stutter: (I very rarely use Timewarp and keep forgetting about how this works myself when I do):
In my example, I wanted to play a 15fps clip at 25% speed, but then played back 4x as fast (60fps) to make up for it. ie. this just creates interpolated frames, but keeps the apparent playback speed the same.
So I set the composition to 60fps, and dropped the 15fps clip in it. If you now try to Timewarp it to 25% it will stutter. This is because the 15fps clip is still playing back at 15fps – so in the 60fps comp it plays a frame, and then repeats it for another 3! That’s what Timewarp gets, so it assumes the movement regularly stops = regular stutter.
The solution is to Interpret the clip to 60fps first (so no frames are repeated in the 60fps comp).
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