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AE's sub-pixel sampling foils your plan, it would seem. The technique you describe would only work with all layers at draft quality to enforce full pixel increments, but not at the default best quality. Parts of the blur may end up on the wrong scanline, giving that rolling effect.
Thanks, I'm going to try different renders with different pixel render settings. Do you have any other ideas to fix up this footage if this method unfortunately doesn't work in the end?
An interesting note on this footage... I remembered it was shot using a Panasonic DVX-100 with the 24p mode that would record in 30 fps...
So, basically, it looks like the way the camera "made up" that extra 6 fps was by adding a blurred 1/2 field between A & B at a certain interval per second. Then, it seems this 1/2 field is blurred between A & B.
Or something like this?
It seems like the weird shift on the clip is actually happening on that 1/2 field, so when the entire clip is duplicated and the +1 directional blur applied, it removes the blur on the 1/2 field and it suddenly becomes very visible and crisp.
Yeah, quite possible. But then you should be able to remove it with one of the pulldown settings by interpreting your footage as 30fps and compensating with a time stretch....