Sped Up Footage Isn't Smooth

J

Joe_Hicks

Well-known member
I'm wanting to speed up a clip, shot at 60i, just slightly to fit a time allowance. I'm looking at roughly 108-110% of normal. I've done the audio alterations in Audition, which came out fine. The problem is the footage isn't smooth. In faster moving segments there is what you might call tracers or motion artifacts. The footage was shot at 1/120 shutter.
I've tried all the normal stuff, de-interlacing, frame smoothing, etc to no avail.

Anyone have any other ideas? Would After Effects do a better job?

BTW, I'm using Premiere Pro 2.0.

Thanks,
Joe
 
As a rule in video clips increments and decrements of 25% give the best motion in speed changes.
 
For a better "timelapse" the shutter speed should be slower than normal so at 60i if you plan on speeding it up 200% your shutter speed should be 1/30th as apposed to the normal 1/60th. With your current shutter speed of 1/120th you could orbably get a pretty nice slowmotion at 50% original speed. You can try doing it without frame blending and just exporting the video as an image sequence and delete every other frame.
 
Joe_Hicks said:
Anyone have any other ideas? Would After Effects do a better job?

BTW, I'm using Premiere Pro 2.0.

Thanks,
Joe
Click to expand...
Yes using AE7 would be much better.

I don't agree that 25% is the magic number. There are a lot of variables, like shutter speed, motion blur, etc that effect how well slowing down or speeding up footage will work.

You just need to experiment a bit with different frame rates, in AE varying from 108 - 110% can make a significant difference.

Also, I have had to break up a clip into several clips and varied the frame rate on each by a very small amount to get beyond a part of the clip that worked well at a frame rate but part of it had "issues." The difference in the resulting clip where imperceptible.

Try this in AE7 it should work much better.
 
for a speed increase of such a little amount you really shouldnt need to use any added motion blur or frame blending at all really. although its not relative to a solution, i think the problem here is that the original footage was shot at a higher than normal (2x) shutter speed. a higher shutter always makes for a more staccato effect to begin with. as far as a solution the faster shutter would make one assume that some motion blur of frame blending would smooth it out a little, but apparently its not working. what i would suggest is trying it noral with just a slight rate stretch.. and if thats not satisfactory, try utilizing the video time effect tools on top of the rate stretch/retiming if the retiming alone isnt working.
 
You must log in or register to reply here.
Back
Top