Problems encoding for menu transitions using compressor

I am trying to encode a set of menu transitions made in after effects. If you imagine a red word against a black background scaled up so that the first letter of the word fills the screen. This letter also has some large black inside it (black on red). The word then passes through the frame revealing the different letters until resting on another menu (it also has quite a strong motion blur)

When I look at the encoded file in QuickTime or in DVDSP it contains a LOT of artefacts (not present on the original render) as if it

This problem happens before I build the project when previewed in QuickTime or DVDSP. Also I'm not adding anything on top of these files they are are just m2v files added to a track. Would DVDSP still re-compress these?