Roland VR-3EX and 2013 iMac

I’d like to take the output from a Roland VR-3EX AV mixer with HDMI output and run it into my 2013 iMac running BoinxTV. Since the Mac only has USB and thunderbolt ports, what am I going to need to make this connection work?

The cheapest solution is getting a BlackMagic Ultra Studio Mini Recorder for Thunderbolt.

Thanks, Bastian…
Any thoughts about the BlackMagic Intensity Shuttle or the Intensity Extreme?