Mixed Multi Angle DVD Encoding Problem

[werdna1900]

I'm trying to make a Mixed Multi-Angle DVD (just to be clear - a full length DVD movie that is only Multi-Angle during certain chapters).
I'm using DVD Maestro 2.9.2915 and my original files are AVI's that need to be edited first, which i do in NeroVision Express 3.0.1.27, and then turn them into VOB files so i can encode them later.

I'm using MainConcept Mpeg Encoder 1.05.00.00 and Canopus Procoder 3.00.50.00. At the moment, as a test, i'm just trying to get one Multi-Angle video out of Maestro, so i'm using 2 files that have been edited to the same length and i've used the same format and encoding settings for each file, plus of course i've chosen closed GOP's each time, and a constant bitrate of 4000kbps. In Maestro though, whenever i try to insert the second file into the movie, i get a message like - Number of GOPs in angle block are not identical.

Can anyone give me some advice on what encoding settings to use or hopefully recommend an encoder that might be better suited to Maestro, or maybe point me in the direction of a good, easy to understand guide?

I've used DVD Lab Pro 2.5 in the past to create Multi-Angle DVD's, (which doesn't seem to be as picky about identical GOPs) but not Mixed Multi-Angle, does anyone know if this is possible with this program, and if so, how?
I had an idea that if i used DVD Lab Pro to create my single-angle and multi-angle videos separately, then maybe i could find another program that could merge them into one VTS Title, but i i have no idea is this is even possible.

I know that multi-angle is tricky stuff so i appreciate any help that anyone can give me, thanks. :)

[Emulgator]

This Maestro version's muxer is very outdated (2001, I guess),
I can not even FFWD/REW discs that have been muxed by this version of Maestro.

As far as I know DLP's muxer is only capable of muxing Multiangle
if you specify the particular part (where multiple angles are to be present) as a multi-angle-title.
If you got single-angle parts before and/or after these got to be separate movie titles.
You link these via connection window as usual.
In DLP there is no seamless muxing across single/multiangle borders.

Furthermore there are tight encoding restrictions for multiangle:
Strictly closed GOP, (PAL:12 NTSC:15) no auto-I-frame insertion, equal GOP bit length, max 6Mbps !
Some encoders have extra encoding settings for multiangle.
(CCE can do, Procoder : I only have Procoder 2 Express,
this one came with Edius, don't know what Procoder 3 offers,
Mainconcept: I have MC 1.5.1 Standalone, this one has no settings for equal GOP bit length).

Sony DVD-Architect can build mixed multi-angle DVDs as you desire, here you just import .avi.
Multiangle encoding is then mandatory done within DVD-A (Mainconcept encoder SDK)
In case of mixed multiangle there is no preencoding possible,
it would be too hard for the average user to specify these parameters, I guess.

And of course Scenarist (here multi-angle can be muxed cell-wise, if I remember right),
but I don't have Scenarist.