Object selection worked great on the first frame, but lost ALL quality as soon as I advanced even one frame, and the subject hasn't even moved yet. Trying to refine it doesn't seem to even work.

For some reason, it only seems to work well on the very first frame. smooth edge and well defined nooks and crannies. I advance one frame and it becomes all blocky and loses all of the edges it just had, without anything moving in the frame.