I have used rotobrush to segment a video on an element whose color is close to the background. and even if rotobrosh did a great job, i have an issue with an unstable mask shape over time. is there a solution in After effect to edit the mask that rotobrush creates? because in my case i dont think it is easy to give more information to rotobrush to force certain masks to a desired shape.
In Flash there is a great feature called "onion peel" that allow to edit element for animation. does it exist a way to do that in after effect to correct a mask shape over time and keep consistency?