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How do yo adjust the speed of an animation precisely in px/sec so that it is an even amount to prevent jitter?

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Scott Clements
How do yo adjust the speed of an animation precisely in px/sec so that it is an even amount to prevent jitter?
on Oct 28, 2014 at 3:27:53 pm

Hi,

I have an animation, in which text flies screen right to left over a very long period of time. Unfortunately, there is a fair amount of jitter and the text is hard to read, despite moving slowly. I read that this is probably because I'm not moving an even amount of pixels per second.

I went onto the forums here and one fellow was saying that he had the same problem with an element of his moving at 59.97 px/sec, when it should be moving 60 px/sec.

Unfortunately, I do not know how to see what speed my animations are moving in by px/sec - I simply adjust speed by moving keyframes further away or closer towards each other. How do I make this calculation properly and reduce jitter?

Film Editor, London UK
http://www.scottclementseditor.com


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Todd Kopriva
Re: How do yo adjust the speed of an animation precisely in px/sec so that it is an even amount to prevent jitter?
on Oct 28, 2014 at 4:27:04 pm

> I read that this is probably because I'm not moving an even amount of pixels per second.


That is confusing two different issues.

The flickering that occurs in fine details from _vertical_ movement in interlaced media is technically called 'twitter'.

The strobing or flickering from _horizontal_ movement is called 'judder'.

They have different causes and fixes.

See this article about preventing judder:
http://kb2.adobe.com/community/publishing/908/cpsid_90843.html

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Todd Kopriva, Adobe Systems Incorporated
After Effects quality engineering
After Effects team blog
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Cassius Marques
Re: How do yo adjust the speed of an animation precisely in px/sec so that it is an even amount to prevent jitter?
on Oct 28, 2014 at 5:13:45 pm

you can see the speed if you select the position property and click on the graph editor switch (shift +f3) and switch to curve speed (if it ain't there already) OR right click the keyframe and select keyframe velocity...


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Scott Clements
Re: How do yo adjust the speed of an animation precisely in px/sec so that it is an even amount to prevent jitter?
on Oct 28, 2014 at 8:38:32 pm

Thanks a lot Cassius! That's exactly what I wanted to know.

Film Editor, London UK
http://www.scottclementseditor.com


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Richard Garabedain
Re: How do yo adjust the speed of an animation precisely in px/sec so that it is an even amount to prevent jitter?
on Oct 29, 2014 at 4:17:39 am

I used to get it a lot when i started off. Now it never happens ever. Maybe its because i work in 29.97 fps.


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Dave LaRonde
Re: How do yo adjust the speed of an animation precisely in px/sec so that it is an even amount to prevent jitter?
on Oct 30, 2014 at 12:34:00 am

Odd motion artifacts like jitter & judder show up more in low-frame-rate video, and less at higher frame rates.

Dave LaRonde
Promotion Producer
KGAN (CBS) & KFXA (Fox) Cedar Rapids, IA


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Scott Clements
Re: How do yo adjust the speed of an animation precisely in px/sec so that it is an even amount to prevent jitter?
on Oct 30, 2014 at 12:45:07 am

I'm working at 25 fps.

Film Editor, London UK
http://www.scottclementseditor.com


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