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I'm using rotobrush on a 17 minute talking head piece to change the background.
It appears the best work-flow is to trim the long master clip into shorter, manageable segments.
(on my Mac 15 second chunks seem to be manageable)
The rotobrush effect with all it’s parameters is copied with the clip.
But the span remains locked at the starting frame of the first segment so it’s calling for way too much propagation.
I can create a new span by making a new base frame at the in point of the new layer, but because it’s a new calculation based on the pixels in that frame, it won’t match the boundary or the refine brush at the outgoing frame.
Effectively creating a slight jump-cut at each new segment.
Anyone know a better method of doing this??
If the footage was shot with rotobrush in mind, and you can get really good propitiation seventeen minutes will take about a whole day to rotobrush. It could easily take much longer.
You do not want more than a few seconds in any single application of Rotobrush. You also do not want 17 minutes of Rotobrush work in a single comp. The AEP file will be huge and much more likely to be damaged when saving or opening.
The best workflow recommendations that I can give you are:
Your seventeen-minute shot could be done in just a few sections but you risk fouled up mattes and wasted time. If all of the shot must have the background removed and there is no way to use some kind of procedural matte, then I would break it up into at least 34 pieces.
I hope this helps. If we could see a few frames of the actual shot we might be able to make some other suggestions that would help you work a little more efficiently. Send 17 minutes to me that was not shot with removing the background in mind and it might cost you a couple of grand to get the work done.
Thanks for taking time to advise.
This is all consistent with my understanding and very helpful.
I've got a similar problem. I'm rotobrushing a 3min video (shorter than 17!), but the propogation rendering appears to only autopropogate for a few seconds then it stops and loops playback. I'm a bit of a newbie, attempting to follow your workflow advice. How do I break the full file up, then work on each individual without it trying to render the whole project as I go?
Thanks, in advance
Did you find the answer? I have the exact same problem