@gingerbeardman One frame (16 ms at 60 Hz) is going to be very difficult; different viewing applications add various amounts of presentation delay.
Common/inexpensive dongle chipsets like the MS2130 will only get you down to ~50ms, depending on viewer.
The closest solution I'm aware of is a Magewell Pro Capture PCIe card and a viewer using MW's low-latency API. Using their example app, I can achieve ~17ms latency. Of course, the form factor is a bit cumbersome. :)
Magewell's docs aren't clear on this, but it's possible that the low-latency API works with their Eco Capture M.2 cards as well. That'd let you use an Eco Capture AIO inside a Thunderbolt <-> M.2 adapter with your MacBook.
EDIT: see reply
Allegedly it is possible to achieve equivalent latency with BMD DeckLink devices, but I haven't seen a turnkey software solution for that.
I haven't seen any equivalent solution for iPad.
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