The reason for this: I have a large iMovie project which iMovie cannot export to a single HD 1080p MOV file for import into iDVD. I now have to try spiltting my project into 2 or more parts and export a HD 1080p MOV file for each part. I then import the parts into iDVD and string them together so that they play as a single movie when the user clicks on Movie A.
I am running the latest version of iMovie11: 9.0.4 (1634) and iDVD 7.1.2 (1158). My raw project is 116 MB and 66min in size. I am working on a 15.4inch MacBook Pro I bought in Jan 2009 with the following spec: Mac OS X version 10.6.8, Processor is 3.06 GHz Intel Core2 Duo, Memory is 8 GB 1067 MHz DDR3 with 250GB solid state drive and 120GB free.