Edges get pixelized or become block"y"!

[peymanrah]

I realized the edges in the output video with the default parameter settings gets pixelized or shows signs of blockiness (lack of information, either depth or context etc...).. Has anyone encountered this "blockiness" defect at the edges, where the foreground and background gets separated? How do we fix this? which parameter/s should be tuned to have less blockiness defect at the separating lines and more crispiness at the defining edges, separating foreground and background?

[CharStiles]

I have also ran into this problem.