Video's added to drop zones in iDVD menu themes look terrible, before and after burning the iDVD projects to DVD.

Every video looses quality. They "blink/jump". For example the eyebrows or cheeks of people jump up and down and are very noticeable. It's as if the footage has been scaled up from a smaller image.

This issue has been adressed before:

Does anyone know how to handle this? Is there a workaround?

I'm using iDVD 7.1.2 - and iDVD 3, 4, 5, 6, 7 themes.