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judder/jitter/stutter/jerky horizontal movement

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Shaun Young
judder/jitter/stutter/jerky horizontal movement
on Sep 9, 2010 at 6:35:43 pm

I've scoured the forum in attempts to understand if what I'm seeing is a visual illusion and if there's anything I can do to remedy it.

I'm just taking a hi-res still and moving it right to left using linear keyframes. I've added an expression that rounds it's position on every frame to be a whole number. I've tweaked shutter settings. I've added motion blur. I've tried 23.976, 29.97, 59.94, progressive, interlaced. I've tried burning to dvd (as this is the final delivery format). I've tried compressing to h.264 to thwart HDD speeds. Nothing has helped. I've built an entire reel that showcases work this way and everyone likes it so I'd hate to have to start over and abandon this move.

HELP? Please?

Sample posted here:
http://www.shaunyoung.com/judder.mov


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Todd Morgan
Re: judder/jitter/stutter/jerky horizontal movement
on Sep 9, 2010 at 7:29:18 pm

My guess maybe you are keyframing every 30 frames when you make your compression output. Try keyframing every frame and see.


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Shaun Young
Re: judder/jitter/stutter/jerky horizontal movement
on Sep 9, 2010 at 8:29:06 pm

unfortunately this didn't help :( but it was a good suggestion and one that I had not tried.


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Tudor "Ted" Jelescu
Re: judder/jitter/stutter/jerky horizontal movement
on Sep 9, 2010 at 7:33:56 pm

If motion blur doesn't help, render an uncompressed version interlaced and then compress de-interlacing (progressive).

Tudor "Ted" Jelescu
Senior Compositor/VFX Artist
Bucharest, Romania


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Shaun Young
Re: judder/jitter/stutter/jerky horizontal movement
on Sep 9, 2010 at 8:24:49 pm

should the uncompressed interlaced output have blur?


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Tudor "Ted" Jelescu
Re: judder/jitter/stutter/jerky horizontal movement
on Sep 9, 2010 at 8:31:57 pm

I found it useful to ad a .3 to .5 blur on animated stills (gaussian or reduce interlace flicker)

Tudor "Ted" Jelescu
Senior Compositor/VFX Artist
Bucharest, Romania


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