[I happen to be working on an animation of my own right now.]

Your 'wip 2' (3840x2160 downsized to 640 X 360) looks *much* better than your
first wip. So the original problem was not due to the MPEG compression your
used-- I checked both videos' 'bit rates', and wip 2 is even more compressed,
slightly. But it still looks quite nice.

I made a screenshot from your wip 1 (see attached.) The window and some other
parts show 'jaggies'-- as if no antialiasing was used at all, which is quite
strange. I would have assumed that your aa2 method would have completely
eliminated those.

Do you still have your original 640 X 360 animation renders from wip 1? Maybe
take a look at some of those, to see if the jaggies are present there.

As B.E. said, a possible problem is that your scene has very sharp narrow lines
and tiny details, which can sometimes react badly to aa. (You mentioned that you
turned off your aa jitter. As a suggestion, try using aa method 1 with a setting
of zero, and turn ON the jitter. Who knows, it might help! I am currently using
that set-up, and the final MPEG animation result looks fine to me.)

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