The Canon HV20 has some menu configurations that if not set correctly will cause capture options in software to not recognize the camera. I sold my HV20 to finance the HF100 and I don't remember EXACTLY what the settings are, but here what I can "dig up":
In the record setup you want HDV.
In the playback setup there may be two items and here you may have to refer to the manual and do some search on the HV20.com forums but one choice may be "auto" where the cam outputs whatever format is on the tape, and the other must NOT be "DV LOCKED" or something like that.
I had a heckuva time getting it right with mine but once I did it worked with Pinnacle Studio, HDVsplit, and whatever else I tried. If the 3 items are not set correctly HDV output is NOT recognized by anything and it's critical enough that I can see Cyberlink not getting that right therefore declaring the HV20 not on their compatible list.
Here is one more thing that makes configuring the HV20/HV30 a big "pain". Your menu choices on the camera, if not correct while connected by firewire (IEEE1394), are "greyed out".
DO NOT DISCONNECT OR CONNECT THE HV20/HV30 WITH EITHER THE CAMERA OR COMPUTER POWERED UP!
These models are somewhat more sensitive to static and sudden current changes in the firewire circuits and there are many complaints of "fried" ports on the cameras.
So power down both computer and camera before disconnecting or connecting the cable. Then power up the camera and make the menu changes you need to try, power down the camera and connect back to the cable (which is still hooked up to the computer). Power on both and see if the change works. Once you get settings that work, write them down where you can refer to them.
Hope this works. If I run across wherever I wrote the settings down I'll post them here.