I have a problem with masking in Blenders compositor. Look at this screenshot:
Notice the white rectangle around the television at the left? It is created at the edge of a mask I use for when the ball passes behind the television. Quite ugly.
The mask itself is just a white rectangle, nothing else.
Also take a look at the crude (grey big pixels) maskng around the seat. Brrrrr.
Is there maybe some kind of precision value or anything I need to set to get decent masking?