I've been playing with Open Divx I think v.4.08a. I'm impressed with the color and picture clarity over Divx 3.22, but it's missing low and fast motion versions, and I can't merge a high bitrate with a low bitrate in Make Film TNG, or Avi Revolution (for Variable Bit Rate). I'm under the impression that this codec does the VBR itself, but haven't found much info on it.