Perhaps you need the equivalent of an "exclusion band", or something.
Code:
prev = source.selectevery(1,-1)
next = source.selectevery(1,1)
source.LetterBox(32,64).SCSelect(next,prev,source,dfactor=2.0) # not using top-32/bottom-64 pixels for the decisions
... or maybe it's something entirely else. The motor mechanic can't tell you what's broken when he can't look at the engine.
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