Rotobrush is too slow

Rotobrush is not magic. No root tools are. There are basically two workflows to successfully separate elements in a frame from the background. The first is to carefully plan and shoot the shot with the matte (roto or keying) extraction in mind. If edge detail and contrast are good, you can automate most, if not all, of the process. 

The second workflow is to create the mask manually. Motion tracking, motion stabilizing, and color correction can help the process. I've created hundreds of masks using Mocha Pro and even Mocha AE's rotoscoping tools. If the shot was properly prepared, things go well. If the edge detail and contrast are not good, there are a lot of keyframes to make and a lot of manual mask/path work required to generate a good matte. 

If you want to speed up the process, plan the shot carefully. Choose only the frames that need to be worked on. I have seen projects where only the index finger of an actor needs a matte, but the effects artist rotoscoped the entire hand. I've combined simple hand roto with masks in a pre-comp to reduce the area Rotobrush needs to analyze. Just the other day I ran Rotobrush on only ten frames that I needed to fix with the edge tools. The rest of the eight-second shot was nearly perfect just using Mocha AE. Each shot is different. If you need specific help with a shot, embed (don't attach) a screenshot by just dragging it to the reply field, and we can give you some meaningful suggestions. 

None of this matters in any way. Rotobrush and mask tracking are simply slow as hog. They'll never be realtime. For mask tracking your money would be better spent on mocha Pro or Silhouette Roto than on hardware and that also kind of takes care of Rotobrush by substituting an d surpassing it with much more usable masking functions.

Mylenium