I shot some footage at 60fps (D800 1/125s and tried 1/60s). In Premiere, I created a new sequence set at 24fps. I have tried both Speed/Duration (40%) and Interpret Footage > Assume Frame Rate: 24fps. With the Speed/Duration route, I tried all three options for Time Interpolation: Frame Sampling, Frame Blending and Optical Flow and all seem to provide the same result...
After rendering the clip, all of these permutations provide a (nearly) identical video that seems to stutter or jump a frame or two about every 1/2 second.
The Export Settings dialog has its own Time Interpolation setting, which is set to Frame Sampling by default, although I'm not entirely sure if that is what's causing your problem.
Set that to Optical Flow or Frame Blending and see if it helps.
The other approach is to export your original clip to an image sequence, and then import that sequence at 24 fps. You will not get any frame drops with this method.
In the 8 years of shooting I've never had this issue. I shot at 60 fps with a shutter of 1/125 and then dropped it into a 23.976 timeline and slowed it down by 40% and it's extremely choppy. Usually when doing this I get buttery smooth slow motion footage. I've tried exporting with optical flow and frame blending like explained above but still getting the same issue. I need help!
Two things I would try: dropping back a Premiere version and turning off Hardware Encoding/Decoding. (Not saying those are things you want to always have to do but just trying things.)
Ive never had a problem with Premiere pro doing this until now. I shot at 59 fps and then use Interpret footage to set the clip to match my 23.976 timeline - this used to result in nice smooth slow motion, now it is choppy, what has changed??
@christopherb50820406 Depending on your video codec and hardware, 60fps is potentially going to be difficult to play on many systems, so that isn't surprising to hear in and of itself.
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