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motion jitter in HD vs SD
I have noticed an increased amount of motion jitter when working in HD.
I’ve been setting up the image move comps and previewing them on an HD CRT monitor. It really seems to me that there is a great deal more motion jitter going on in a move than I typically come across in SD compositions.I have motion blur on for the images, am rendering to fields, and I’ve also overridden the shutter angle in the render settings. In some, I’ve gone up to a shutter angle of 720 degrees and am STILL getting a motion jitter (not moires, but a stuttering in the move).
I don’t even know what else to do to try to get rid of this. Adding a fast blur might help, but it decreases the quality of these images too much. I’ve shorten the move or reduced the speed whenever possible, but that still isn’t enough in many cases.
As I am unsure as to WHY or WHAT is making this difference in SD vs HD moves….I am unsure how to try to fix it.
Have you come across any problem such as this in your work in HD?Alisa Placas
Lucid Animation
Cambridge, MA -
4 Replies
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Never done HD in AE, but I’ve done a lot of editorial with 24p HD originated material (downconverted to SD). When the camera moves too quickly there’s a tremendous amount of jitter. This is related to the pulldown – the movement between frames is far enough that the offset of the fields produces jitter.
Posting your comp settings would be helpful. Frame rate, progressive, interlaced, etc.
I’m out of my element here.
Cue: Steve -
The comps I’m working with are:
1920x1080i
29.97
square pixelsI’ve been rendering to the DVCPro HD codec….upper field first.
motion blur is ONAlisa Placas
Lucid Animation
Cambridge, MA -
Create a small white solid and move it across the screen left to right for 30 frames. Render it out as Upper field first and Lower field first.
This is the easiest, fastest and sure-fire way of knowing which dominance works.
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Thanks.
Sounds like field order might be the issue.
I didn’t even think of that because I’d read that HD was “upper field first”….but I am watching these with a Blackmagic card and their codec is “lower field first,” so, hopefully, that is the issue.Alisa Placas
Lucid Animation
Cambridge, MA
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