Pixelated Transitions

I made a simple slideshow of photo stills in iMovie that I imported to iDVD. When I play the burned DVD (I tried on several different DVD players) some, but not all, of the slides are initially VERY pixelated....after a second or two the slides snap into focus. (I use a simple Ken Burns effect on each slide.)
Is this a problem with
a)iMovie,
b) iDVD,
c) the DVD discs I'm using
d) the burn process
e) the DVD players in my house
f) random goblins....??

then clicked the "Create iDVD Project" button that appears within iMovie
If you look at the iMovie application you will see this is an option under "Share" - silly name!
It lets iMovie render your photos and generally foul them up DON'T USE THIS FOR PHOTOS. Instead open iDVD, select a new project and then drag the .mov file of your iMovie project onto the screen, then burning with best quality should show an improvement as iDVD will render the slideshow.
Give it a try.

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