Encoding/Editing question

[cheeks]

Hi,

I have a big MPG file (almost DVD quality) and I am trying to make a 30 second preview trailer with it.
The file is about 700MB big. I am using TMPGEnc. I cant load and work with my original big file cause TMPGEnc. simply wont handle it.
So I am trying to encode the big file with TMPGEnc. and the output file I get is much smaller ( about 85 -250 MB big).

The problem is that the smnaller file is now in slow motion.
I tried playing with the Tsunami specs but the end result is always a slow motion file.
Is TMPGEnc. to basic of a Tool to do this or am I simply setting my specs badly.

Any suggestions.
Thanks alot!