virtualdub and virtualdubmod can't output mpeg/2. virtualdubmod can read it and then frameserve to another program such as tmpgenc to encode to mpeg/2.
It wouldn't at all suprise me if the HCW2 codec is taking the MPEG/2 output of the card and decoding it back to individual frames or just wrappering the MPEG/2 so it can be put into an avi container. I don't know enough about it to say either way though.
Read the SHS PVR forum mentioned above, it might give you some info about what cards can do what.
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