@ ezysk..
yes, I'm w/
Kwag on this one.
Usually, a .D2V file has the timecode (or other codes) that
MStacker
should report correctly.
But, an .AVI may not have these and may not be obediant w/ other apps.
Also.., if these are "captured" .AVI files that are giving you these issues,
than the only thing I can guess as to why you have this issue w/ incorrect
fps readings is that YOU are dropping frames (mother of all evils) hehe..
A suggestion maybe..
If you can open in vdub, please test the accuracy in its time-line window,
where it shows (status line) how many frames and minutes are in total.
* Once inside, proceed to press Ctrl-cursor-RT key, and this will bring you
...to your end point. Then, observe the frames and minutes. Note the
...frame, case
MStacker is not be counting it right (though it prob. is)
...(but, just in case)
That's it for now.. good luck

-vhelp