Nikon D90 exhibits step-stepping due to what I suspect is a poor implementation of binning/scaling when it takes it's 720p frame from the much higher resolution sensor.
One way around this is to put back in (through interpolation) the binned lines and then scale the new (now taller) file back down to size (90%).
I hope that makes sense, sounds confusing to me and I wrote it !
Note to Nikon: please check the R&D department for both saboteurs and idiots.
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