I watched the video again and I think I now see what you are referring to. This is a natural by-product of speeding up the clip. When you are panning a shot, the camera lens moves a certain distance between each frame of video being taken. The smoothness of the original shot will depend on the frame rate being used, and the speed of the pan. The lower the frame rate, the slower you need to pan the camera to keep motion from looking choppy. When you increase the playback speed, you are skipping some frames, so the motion is not as smooth as the original clip. A frame gets displayed, then it might skip the next frame and play the frame after that, so the motion of the pan "jumps ahead" and that is what you are seeing. Think of it this way - if you do a pan at a set speed, shooting 60p, you have 60 individual frames per second. With frames being captured very often, the camera doesn't move that much between each "snapshot" of the mountains, and this creates smooth motion on playback. Now shoot that same pan again at 30p, and you have only 30 frames representing the same range of motion, so the distance the camera moves between each frame is doubled, so the motion will look choppier on playback. Now switch to 24p recording, and the pan looks even worse yet! When you apply 150% speed, the playback is going to skip every other frame or something like that, so the motion is going to look choppy or jerky, similar to shooting at a lower frame rate or panning faster. You are not seeing every frame as originally shot - you are "skipping ahead" almost like hitting fast-forward on a video player. I'm trying to think of how this works at 150%....If you play the clip at 200%, Premiere is simply going to play every other frame, for example play all even frames and skip all odd frames. The playback may not look real smooth, however the motion will be consistent. When playing at 150%, that introduces a bit of an issue. Maybe I'm wrong, but I think 150% would be the equivalent of playing two frames, skipping the third, playing two more frames, skipping the third, and so forth. Now you have a weird cadence of playing two consecutive frames = smooth motion between those two, then skipping a frame, so there is a jump in time/motion taking place on playback - the camera pan jumps ahead a bit for every third frame of playback at 150%. I think. This is not what I would call stutter, which is why I didn't see it at first - I was looking for something else. I would define stutter as occasional playback weirdness - the clip is playing just fine and suddenly gets jerky and then returns to normal. I think what you are seeing is the unnatural cadence of the frames. Think of cadence like marching soldiers. Every few steps, they do some sort of double-step or skip rather than just marching steadily. Whatever odd thing they are doing every few steps creates a cadence or rhythm. In the Speed/Duration dialog, under Time Interpolation, change Frame Sampling to Frame Blending or Optical Flow and see if that helps any with the results you see. Thanks Jeff Pulera Safe Harbor Computers
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