http://www.iulabs.com/drv/faq.shtml#Q8 wrote: Q8: Why is VirtualDub software unable to capture a frame with more than 288 pixel rows in PAL mode (or 240 pixel rows for NTSC)?
A: VirtualDub, like any other VFW based software, uses a so-called wrapper to translate VFW calls to their counterparts in "DirectShow/WDM world". This slowdowns your PC a bit, and the wrapper grabs only one TV signal field. This results in only 288 lines for PAL/SECAM and 240 lines for NTSC. I think it would be possible to modify their wrapper to solve this problem but unfortunately I do not have the free time and special equipment needed to work on it.
Perhaps you could use Pinnacles software? Maybe you can get it off their website. Also I am sure the card came with it's own capture software. Can't you use that? Either way, it sounds like vDub is not going to work for you.
~klinky