Hi Maineman,
We can't guarantee how well accessories we don't make will work with the camera, so you may wish to check with the company who makes your HDMI capture card.
You can also check with general video forums for additional recommendations about third-party accessories:
dvinfo.net
cinema5d.com
creativecow.net
We aren't able to provide forum support for the VIXIA HFM31, so if you need additional assistance, you may wish to contact our phone support line by calling us at (800)652-2666 on M-F from 9am-7pm EST and then select the camcorder department.
