What is the size of capture window for MX440-VTD8X?

I am trying to figure out how best to resize video I have captured with my MX440-VTD8X. For the application I am using (AVISynth) I need to calculate the PAR (Pixel Aspect Ratio), for this I need to know the size of the capture window for my video capture card.
I think that this card uses a Philps SAA-7114H, although I cannot be certain as MSI don't seem to publish this fact anywhere. (I found a few references to the 7114 via Google so that is the best lead I have had so far).
Anyway, even if I knew it used a 7114H that doesn't much help as I can't find any published data that tells me what the capture window (in microseconds) is for this card. The WDM driver might modify the window so how, so I can't just look it up in the datasheet for the 7114H.
I am looking for figures for the capture window for both PAL and NTSC,
could someone please help?
many thanks,
Kevin

To quote from the article I have been using which gives step-by-step instructions on how to calculate to aspect ratio ..
(Pixel Aspect Ratio, Source Aspect Ratio and Target Aspect Ratio)
"To determine your source PAR, you first have to know what the aspect ratio of the capture window of your capture device is. This capture window is fixed, but again it is rarely exactly 4:3. The device always digitizes the same area of your video and resizes it to the size you set in your capture application. The raw captured height is always 480 lines for NTSC and 576 for PAL. The width of the capture window has to be determined. A table with known values (and a more elaborate explanation) can be found in section 5.4. A method for determining this value yourself can be found in chapter 11.
Once you know the capture window width, the Image Aspect Ratio of your device can be calculated as:
PAL IAR = (4 / 3) * ([window width in µs] / 52.0 µs) / (576/576)
NTSC IAR = (4 / 3) * ([window width in µs] / 52.6555 µs) / (480/486) "
The 'window width' is given for some capture cards in the guide, but unfortunately not the MSI one I am using, and the 'window width' does vary from one type of capture card to another.
Without this information I am at a brick wall. There is a method to determine the window by using a PAL DVD player as the source video, playing some test image, the problem is that I only have an NTSC DVD player so I can't use that technique,
this is something that the manufacturer must know, but unfortunately they rarely publish it,
Kevin

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