GOP structure error in DVDit

[xskhaos]

I am using DVDit PE to try and author a DVD of a VCD file I downloaded. Problem is, twords the end of the process where it tries to split the MPEG file into 1GB VOB files, it gets an error that says "cannot read GOP structure at 00:00:00, I think the problem is that in order to get DVDit to accept the MPEG file, I had to use DVD patcher and Change the resolution on the first header of the VCD Mpeg from 480x480 to 352x480.

Im not to farmilair with what exactly the GOP structure is, any info on that would help.

Im sure there is some explaination for this, any help would be appreciated.