SDI->Thunderbolt “converters” are capture cards, they just use TB as the physical connector. Also, not all capture cards have the same feature set. Some of thes

SDI->Thunderbolt “converters” are capture cards, they just use TB as the physical connector. Also, not all capture cards have the same feature set. Some of these cards have SDI capture and/or output, sometimes simultaneously and some with up to 8 SDI IO connectors. Some cards also do HDMI capture and/or output of the same or different feeds as the SDI signal(s). The landscape of capture cards (not just SDI) is pretty diverse. It all depends on the kind of workflow you’re dealing with. Live productions in particular will often demand many connections, to be able to capture multiple camera angles, as well as to output to confidence monitors and/or backup recording devices, frame syncs, switchers, SDI routers and more.