Poor quality after previewing in iDVD

I created a movie in imovie '09 with video and still images. Movie plays well and looks good when previewed in imovie. I shared to media browser and opened the movie in idvd. All of my chapters came up great and everything looked good until I previewed the movie... horrible quality! Both the still images and video look very pixelated, like they are "shimmering". I've had this happen with other movies I've created using imovie to idvd before but don't know what causes this. I have not even burned the movie yet because of how bad the preview quality is. And I know from past experience that it will look like this when I play it on the tv too. Does anyone know what is causing this and why it only happens with some movies and not others? I have not changed the way I've done anything when going from imovie to idvd with any of these movies. Some come out fine, some come out like this. Any help would be greatly appreciated!

Hi
Quality on the resulting DVD has many steps.
a. Preview in iDVD are not same as resulting DVD - I do Save as a DiskImage and test this with DVD-tool first - this will show quality (slightly) better.
b. DVD is a standard in it self and can never be better than SD-video (as on old time CRT-TVs) - no matter what program is used eg DVD-Studio Pro or Roxio Toast™ - There are no HD-Video for DVD (more than academic ones - Toshiba and some years ago - no success)
c. Choice of Video-editing tool - makes a difference as
• iMovie'08 or 09 or 11 - discards every second line resulting in a loss of sharpness
• iMovie up to HD6 or FinalCut any version - does deliver full quality over to iDVD
d. How movie is sent to iDVD
• I do NOT use "Share to iDVD" in any version of iMovie as I get a worse result by doing so - I do in
iM'08 to 11 - Share to Media Browser and as Large - and in
iMovie up to HD6 - just close it and import the movie project from within iDVD
FCE/P - Export out as QuicTime.mov and NO QuickTime Conversion - then I use this file in iDVD.
e. Choice of encoding method in iDVD
• I use Pro Quality encoding
f. Choice of DVD brand and type
I only use Verbatim DVD-R
g. Burn speed
I set it down to x4
h. Free space on Start-up hard disk
I never go under 25Gb - iDVD and Mac OS needs this and can not use it on other hard disks.
Yours Bengt W

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