It probably won't, but if it's too high, everything will look washed out as it does in my composite example so you'll know straight away. Colours that look correct won't be out of spec, as anything at the top of the spec or higher will be 100% saturated. For me, the Gamecube looks spot on with no resistors, but the SNES and N64 needed a resistor to correctly set the output level. Since the sync is taken from the composite signal, it stands to reason that if the output level of that is incorrect then you could get a rolling picture.
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