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The warp calculation is currently done for every plane, but doesn't depend on the plane contents, just the dimensions; so this is wasted work when plane sizes don't vary (eg: RGB, 4:4:4 YUV). This will not have a visible impact on performance at realistic interpolation rates as the optical flow generation is the limiting factor until you are doing something silly like 30->900fps. But wasted work is wasted work, so best to stop doing it.