Hey I'm in a big bind right now on a project due in a couple hours. I've shot a bunch of 2K footage at 72fps. I'm editing in a 23.98 timeline where 1 second of footage takes 3 seconds (hence the 72fps.) I am trying to speed up the footage to go a certain length (it was a choreographed 1 shot) and the max speed I have used is 158% (in FCP) However when there is to quick of horizontal movement the clip is a little stuttery. Looks like video speed alteration. WHICH BLOWS. It looks great in a 59.94 or 60 frame timeline but unfortunately I have to export this at 29.97 for its playback from an image server (in roughly 5 hours.) Looking for any advice at all.
Right now I'm rendering out a motion file using the optical flow. FCP's is the one that is stuttering, and I wasn't satisfied with AE's time remapping, that was stuttering a little too.
I would try using Compressor to create the frame rate/timing that you're looking for. Because you're speeding up the timing, you're throwing out frames, which then makes it look like it's stuttering. If you would have shot it at the real-time frame rate instead of slow motion, then the footage would have more motion blur and feel less stuttery.
In AE, I believe there is a filter that will force motion blur on the images that move within the frame. You might try that. Or as I said, Compressor has a way of interpolating the motion that might look okay. You're probably not going to get it to 100% smooth with either of these programs though.
Twixtor usually works really well for those looking for a different solution. Also making an image sequence and throwing away certain frames while sticking to whole numbers can be a lo tech way to fix things sometimes.