Add native interfaced input support - currently deinterlacing is applied which halves the frame rate

[Ste-RH]

Issue brought in from Keeping (#RvNmcyBYF4)

...issues with the FPS of a camera we are reading in through our Decklink Intensity Pro 4k card. We can see in system settings that the signal is being received at 59.94 FPS at 1080i but when bringing the signal into Unity it drops to 30 fps.

...it's giving our graphics a very choppy appearance...

Is there some sort of limitation or setting we should check to get this working at 59.94 fps?

So far I've tried using the force frame rate option as well as opening the signal through the device explorer menu but the signal seems to stay capped at 30 fps.

[CosmicBen]

This seems like it may be possibly related to using AVProDeckLink in HDRP.