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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?
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 -
5 Replies
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> 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:
https://kb2.adobe.com/community/publishing/908/cpsid_90843.html———————————————————————————————————
Todd Kopriva, Adobe Systems Incorporated
After Effects quality engineering
After Effects team blog
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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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Thanks a lot Cassius! That’s exactly what I wanted to know.
Film Editor, London UK
http://www.scottclementseditor.com -
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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