if you're using WDM-Drivers for your capture card it's normaly;
then your only way to capture is via DirectX-API
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Quoted from VirtualDub HP:
"VirtualDub says I don't have a capture device, but I know I have one.
VirtualDub needs a Video for Windows capture driver to capture. Most Firewire (DV) devices do not provide a VFW driver, and thus cannot be used by VirtualDub at all. Also, ATI appears to be shipping their current devices with a WDM (Windows Driver Model) driver only; this can be used indirectly by VirtualDub through a Microsoft wrapper,
but it is crippled in functionality and it also appears that the wrapper is buggy.
The wrapper will show up as "Microsoft WDM Image Capture (Win32)." If it works for you, great."
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ergo: maybe it works, maby it don't works
Btw for me and my Terratec the wrapper doesn't work