HDV exported from FCP 7 into iDVD has red/green moire pattern?

Question

Yesterday I was testing some native HDV (1440 x 1080)  in FCP 7.
I exported it as a QT Movie as I used to in the good old days but when I imported it into iDVD the image was coverd with a greeny-red moire type pattern.
It wasn't a serious problem as I simply re-exported as ProRes and that cured it.
However, I am curious as to what may have caused it as it never occurred in the dim and distant past.

Answer 1

Thanks for testing and confirming my findings Russ.
I didn't get this problem back in 2008 as native HDV, FCP and iDVD worked OK together  .  .  .  at least in that respect.
However, in those days I was using FCP 6 and I wasn't using OS X 10.6.8 or later. So maybe there has been a change in FCP 7 or the OS that has caused the problem.
OK, long answer to Michael as to why I was doing this "test".
Back in 2008 I bought a new iMac and a Canon HV20 HDV camera expecting to see a dramatic improvement in image quality  .  .  .  .  which I did  .  .  .  .  on the computer .
I hadn't mastered DVDSP and Compressor and preferred to use my familiar iDVD which did everything I needed.
So I plonked my edited footage in iDVD and burned a standard def DVD.
I was horrified to find that the DVD footage shimmered badly where any straight lines or fine detail appeared but even worse was the appalling judder that occurred with any subject or camera movement.
I spent several weeks investigating and testing, deinterlacing, swopping fields, converting to AIC and ProRes  etc. etc. to no avail. (Incidentally if I set my camera to downconvert to DV during capture, the DVDs produced were fine, but I wanted to edit those beautifully detailed HDV images not DV ones).
Finally a suggestion from Tom Wolsky solved the problem  .  .  .  .  .  put the finished edited project in a DV-PAL  sequence in FCP and render it.
The result was rock solid images and beatiful smooth  motion.
However, the downside was the time it took to render the HDV project to DV which I found unacceptable.
So I gritted my teeth and taught myself to use DVDSP which got rid of the problem of instability but introduced other, admittedly lesser, but well documented problems. But that's another story.
Now we come to the present.
Last year I bought a Panasonic SD800 3 MOS AVCHD camera, edited in FCP X and exported either to AVCHD Discs or standard DVD.
A few weeks ago I was showing a friend how to use iDVD and the only footage available was my AVCHD stuff.
I used it, expecting the same (or even worse) instability as I had found with HDV.
To my pleasant surprise, the resulting DVD was acceptably stable with smooth motion.
So a couple of  days ago I started wondering whether HDV in FCP X and iDVD would be OK.
It was, which meant I could go back to iDVD occasionally when I wanted one of its custom canned menus.
Then I wondered what HDV in FCP 7 sent to iDVD would produce.
Hence my recent test!
I bet you wished you had never asked, Michael.