Poor qulaity video on iDVD

I've made many DVDs after editing in IMovie but often get problems. The latest is the most annoying as I've transferred 6 movies, 2 slideshows and 2 trailers but the largest of these (a movie) doesn't play correctly.
The dodgy one is 20 minutes long and plays well for the first ten minutes, before the picture starts to distort/"wobble" (just in the middle - ok at foot, top and sides) to such an extent that it's frustrating to watch.
The offending movie was exported direct from imovie using the share/idvd function.
The other movies and all stills are ok.
Any suggestions on how to sort this will be appreciated.
Brian Whitnell

I expected the file size to increase when I changed the settings for the project from Best Performance (1.98 GB) to Professional quality (1.24 GB).
As I understand it, the main thing the so-called professional quality encoding (if that's the right word) does with the extra time it takes to do whatever it does is compress more thoroughly than (so-called) Best Performance and (so-called) High Quality. There is a dispute as to whether Professional Quality produces better looking DVDs. I am tentatively allied with those who say that you get the best quality by using Best Performance--but I have not done much in the way of actual comparison. The price you pay is that you have bigger files, such that no DVD can be longer than 60 minutes. (It is unclear to me if it is about 60 minutes or exactly 60 minutes. I had been under the impression it is the former.) What going "professional" allows you is longer DVDs (up to about 2 hours), not better looking pictures. However, all the books on iDVD that I read claim that you get the best look from Professional Quality. BUT if I read it right, the one book that gives you numbers about what happens during encoding would cause you to expect the best results from Best Performance. There was a contradiction that was not addressed. If anything I have said it manifestly wrong, hopefully it will be pointed out by someone. By the way, it is by no means inconceivable that all the books are wrong. Widely-held errors are common. And textbooks are the most common way errors are copied and repeated. If you combine the existence of the Internet with the standard of fact checking which says you need at least two reputable sources to support any claim, many false notions can be proven and repeated over and over again.
Message was edited by: Paul Bullen
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