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PhotogCda
Inspiring
June 2, 2020
Question

Unable to change Rotobrush edge in successive frames

  • June 2, 2020
  • 1 reply
  • 1862 views

I'm trying to rotobrush an object in some footage. The object is basically round and should be very simple.

 

I have the edges defined in frame 1. When I move to frame 2, the edges are inaccurate.

 

Nothing I do, with either the + brush, or - brush will alter the edges of the mask in successive frames. I can paint in the frame to cover 50% of the area and nothing will change with the edges of the roto mask. I've also tried the Refine Edge tool with no effect. 

 

I've only used the Roto a couple times in the past and never had this problem. 

 

Thanks.

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1 reply

R
Community Expert
Rick GerardCommunity Expert
Community Expert
June 2, 2020

Are you sure you are propagating from one frame to another? What does the footage look like? Where did the footage come from? Are you sure that you have the comp resolution set to full?

 

The ability of Rotobrush to successfully track edges depends entirely on the footage. Motion blur, lack of contrast, focus, lens flares, similar colors, color, and motion compression artifacts in MP4 files all have an effect on the footage. Sometimes, if you throw some color correction on the footage, then pre-compose moving all attributes, then Rotobrush the pre-comp you can get better results. 

P
PhotogCdaAuthor
Inspiring
June 2, 2020

I understand the mask won't necessarily track perfectly frame to frame. That's not the issue.

 

The issue is that I cannot, in successive frames, alter the shape of the mask. Neither the +, nor - brush are working. 

R
Community Expert
Rick GerardCommunity Expert
Community Expert
June 3, 2020

Try updating your version of AE to the latest build. There was a bug on some systems that caused the UI to fail. You might also try disabling hardware acceleration.

 

There are several threads about the brush disappearing. When you said the edges were inaccurate I assumed that there was a propagation error. 

 

Another possibility may be anti-virus software. There are known instances where it can cause background processes to fail.

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