1. A process for encoding video data for face to face video conferencing comprising the process actions of: inputting a video frame of a video frame sequence some images of which contain a face; processing said video frame to locate said a face; if a face is found processing the face to locate features, but if no face is found no longer processing said frame; searching said face for features and using said found features to evaluate whether said frame is a good frame that should be encoded; if the frame is not a good frame, no longer processing that frame; subtracting said frame from said previously input frame to obtain a residual; and encoding said residual with a video encoder.