I have some vob's I wish to convert to SVCD ready MPG's.

I used DVD2AVI to create d2v's from vob's.
I then opened the d2v's in TMPGEnc and selected SVCD template.
I chose my options and then encoded.

Problem:
There is a tiny amount of stutter/jitter for the first few seconds of the MPG but then after that and for the remainder of the MPG it's fine.

Please can anybody offer any explanation for this?
It seems to be worse when I use VBR instead of CBR.

Many thanks for any help.
Graham