Isn't it the other way around so that the first pass is made at full resolution and then the result is used as a predictor for the next pass which is done after downscaling. I agree that small details could well be lost when downscaling. The code seems to set the limit to use HME at 540 pixels of vertical resolution.
What I was wondering with those results of mine was that umh,umh,star was noticably faster than any other combination.
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