Rotobrush question

[dajavudesigns]

What is the best way to get a rotobrush to stay. I have a shot of some shoes and the lighting changes, the guy standing there almost doesn't move at all. I want the roto to sit still for most of the frames and let me go in manually and adjust where need be.

I will roto several frames perfectly then press the spacebar to let it run and it jumps around all over the place when the lighting changes. HELP. Thanks.

 

[story2rewrite]

I found this tutorial. Haven't tried it yet but it seems pretty sound...

http://ae.tutsplus.com/articles/in-depth/simple-principles-to-make-rotoscoping-less-crappy/

I never just spacebar. I use the animation tab on the side and go frame by frame myself. It's painstacking but gets the best results.

 

[Michael Carter]

Seems like a vector mask might be better. I find rotobrush to be too slow and frustrating almost every time. Masking can be insanely boring, but effective - especially if you learn to feather masks to match your shot.

 

[handsome pete]

I never just spacebar. I use the animation tab on the side and go frame by frame myself. It's painstacking but gets the best results.

You might find using Command + right/left a lot easier and quicker.

 

[Edward Parks]

Ditto on vector masking. An adjustment layer masked and tracked to the point also might work.