Roto Rumble – Stuff Looks ok inside the comp, faulty outside - Adobe After Effects

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Roto Rumble – Stuff Looks ok inside the comp, faulty outside

Posted by Ace Billet on February 1, 2011 at 4:42 am

I have a comp with some quick motion. I rotoed an element. Everything looks clean.

When I go to the higher level comps I suddenly artifacts along the border of the element,
as if it is not masked properly (which it is, of course).

here is an example:

you can also notice there is a slight shift in the motion in the frame, even though its the exact position on the timeline. Obviously this can drive a man insane.

• fps: 23.98 in all comps
• no time-remapping / effects. I thought it was time remap related but not.

anyone had this happen to him ?

cheers
Billet

<== BilletHQ | Creative that Goes to 11 ==>
https://www.billethq.com

Walter Soyka replied 15 years, 7 months ago 3 Members · 4 Replies
4 Replies

Tudor “ted” jelescu
February 1, 2011 at 7:31 am

Are you sure that all your comps and clips are at the same frame rate? Any of them interlaced?
Are you doing the roto straight on the layer or for some reason on an adjustment layer?

Tudor “Ted” Jelescu
Senior VFX Artist
Walter Soyka
February 1, 2011 at 4:40 pm

[Ace Billet] “fps: 23.98 in all comps”

Worth noting — what FCP rounds to 23.98 is really 23.976, and the difference is very important. Your comps should all be 23.976.

Also, depending on how you’re working with your precomps, you may need to tick (or untick) the collapse transformations box.

Walter Soyka
Principal & Designer at Keen Live
Motion Graphics, Widescreen Events, Presentation Design, and Consulting
RenderBreak Blog – What I’m thinking when my workstation’s thinking
Creative Cow Forum Host: Live & Stage Events
Ace Billet
February 1, 2011 at 5:05 pm

Thanks good folks.

Yep = changing all the comps to 23.976 seemed to work.

Dave – I’m on a “virgin “CS5, I know the update is out but I don’t like to update in mid-project.
what are the new perks of the update ?

merci.

<== BilletHQ | Creative that Goes to 11 ==>
https://www.billethq.com
Walter Soyka
February 1, 2011 at 5:12 pm

[Ace Billet] “Yep = changing all the comps to 23.976 seemed to work.”

Excellent!

[Ace Billet] “I’m on a “virgin “CS5, I know the update is out but I don’t like to update in mid-project. what are the new perks of the update ?”

Loads of bugfixes. See Todd Kopriva’s release notes [link] for details.

I think this update is worth doing.

Walter Soyka
Principal & Designer at Keen Live
Motion Graphics, Widescreen Events, Presentation Design, and Consulting
RenderBreak Blog – What I’m thinking when my workstation’s thinking
Creative Cow Forum Host: Live & Stage Events

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Roto Rumble – Stuff Looks ok inside the comp, faulty outside