Lord Grievous said:

... does anyone know why it won't work in VirtualDub? I'd rather use that one because it's newer and has a 64bit version.

When I open the AVS script in VirtualDub 1.9.8 it gives me the error "AVI import filter error: (unknown) (80040154)". Anyone know what this means.

Just noticed this. If you're using the 64-bit version of VirtualDub, you'll also need the 64-bit versions of AviSynth, DGDecode, etc...

Might be easier to stick to the 32-bit version at the moment.