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Problem Rotoscoping Footage using a Mask

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Brian RichardsonProblem Rotoscoping Footage using a Mask
by on Feb 20, 2013 at 6:54:54 pm

I have an AE CS6 masking problem and hope someone can help...

I am rotoscoping some movie footage (into my project) using a mask. Once I have finished going frame by frame, I find that on occasion, the mask will randomly offset its original intended position by a few pixels. Even after re-adjusting the mask, I find that the mask continues 'adjust' and I am wondering if anyone else has ever come across this?

Other things worth mentioning;

1. The frame rate of the movie footage and my composition match.
2. The number of vertices remains constant between frames.

Brian R

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Dave LaRondeRe: Problem Rotoscoping Footage using a Mask
by on Feb 20, 2013 at 10:19:14 pm

Are you ANIMATING the Mask path property with keyframes? I imagine you are, but you don't say for sure.

Dave LaRonde
Former Sr. Promotion Producer
KCRG-TV (ABC) Cedar Rapids, IA

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Tom DaigonRe: Problem Rotoscoping Footage using a Mask
by on Feb 20, 2013 at 10:26:15 pm

If you dont resolve the problem, you might want to consider using Mocha AE which comes with AE and rotoscopes extremely well. Do learn to use it from tutorials at the Mocha website before attempting it on your project for best results.

Tom Daigon
PrP / After Effects Editor

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Vishesh AroraRe: Problem Rotoscoping Footage using a Mask
by on Feb 21, 2013 at 3:40:21 am


Make sure you select the Layer while animating the Mask Path and not the Mask itself. If you select the mask and then move any vertex, whole mask will move instead of one vertex.

Also a screenshot of what you are doing would help.

Vishesh Arora
3D and Motion Graphics Artist
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