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Roto Brush propagating every frame in CC2020

New Here ,
Mar 26, 2020

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Hi all,

I've been running into this really frustrating behaviour with the roto brush recently.

Basically I can only do one or two actions before the entire timeline re-propagates. It used to be that it would only propagate the frames after the stroke keyframe (in the direction of propagation), allowing you to iterate along the timeline easily. This current behaviour is unworkably slow. Any idea why it's doing this?

 

• Archie •

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Error or problem, Performance

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Roto Brush propagating every frame in CC2020

New Here ,
Mar 26, 2020

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Hi all,

I've been running into this really frustrating behaviour with the roto brush recently.

Basically I can only do one or two actions before the entire timeline re-propagates. It used to be that it would only propagate the frames after the stroke keyframe (in the direction of propagation), allowing you to iterate along the timeline easily. This current behaviour is unworkably slow. Any idea why it's doing this?

 

• Archie •

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Error or problem, Performance

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70

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Most Valuable Participant ,
Mar 26, 2020

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I beleive there is a known bug that still hasn't been fixed. Regardless, I think your footage would still be problematic and not necessarily propagate more favorably. Perhaps you might want to explore methods liek tracking masks - with or without mocha.

 

Mylenium

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New Here ,
Mar 26, 2020

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Oh it's propagating fine - just very, very tediously.

 

Is it a project by project bug? I've never seen it before.

 

 

The mocha track isn't going great as the reason I'm having to mask these windows out is they're extremely reflective. The tracker gets all kinds of confused. 

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Adobe Community Professional ,
Mar 26, 2020

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You don't need to mask every window in Mocha, you just have to grab one of the corners, then add another spline to the layer and grab another corner or two, then run the track.

 

If this were my shot this is how I would set up a track for the building:

Screenshot_2020-03-26 11.35.38_cKT0kN.png

This will give you a clean track of the building very quickly.

Screenshot_2020-03-26 11.40.30_Whc13z.png

If the goal is to separate the building from the background then a second simple spline linked to the track (layer 1) can be created in just a few minutes. 

 

I don't know what your design goals are but Rotobrush would be my last choice for creating a matte for anything I see in this shot.

 

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New Here ,
Mar 30, 2020

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The tracking is the problem. I'm trying to get a clean 3D camera track of this shot coming out of the balcony doors. The glass reflections on the opposite buildings are throwing it off massively, so I need to mask out all of the glass. Linked mattes in mocha might be a good shout, but it still doesn't explain why the roto brush is behaving this way. Would be good to find a solution for future google searches.

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