Yes it seems that higher reps are needed for really worst case scenarios (made some in mspaint =)).
rep=0 flickers slightly on most 1-pixel lines but works on everything (?) else, rep=3 captures 1-pixel lines, but rep=5 is needed for when two lines are spaced 2 pixels from each other. Here rep=0 fails hard.
What I don't like about rep>0 is that they allow too much blur in motion, and my videos are slightly blurred before being interlaced, so rep=0 works well there.
(I know why the epsilon is used, I just don't like where it's used, even though it makes exactly zero difference =).)
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