I use VirtualDub trim statements in my AVS for editing captures. I assume CQMatic takes this into account when determining the Total Frames value for the sample file size calculation?

Could someone post the CQMatic formula for calculating sample file size using Prediction X3?

If I understand right, what matters is the movie time.
You should write the time after trimming.
The importance of the trim in your avs is when you have parts in the movie that are very different (like credits) and you don't want then to effect the calculations.

As you do "frameserving" CQmatic will never see where you did set trims etc., CQmatic only gets the stream frame by frame like if the stream is not trimmed. and does the calculation on the whole frameserved (and by this trimmed) movie/Capture. Thats the Logic.