Ultimatte 12 in Post

HI
I am considering the new Ultimatte 12 HD box and can see how it could really help with my live keying working in conjunction with my Atem Min Pro Extreme ISO (HDMI), but I am just not clear on the setup.

Is it the case that I would need some sort of media player (I have a Hyperdeck Shuttle) going into the HDMI in on the Ultimatte for the background, and then a camera source on the other HDMI in for the key? I would then run the HDMI out of the Ultimatte into one of the camera inputs on the Atem? If that is the case then i get a pre 'keyed' input as a camera source.

My real question is how can the Ultimatte box (and software) be used after an event to key recorded material. I realise there are a number of ways of keying in post, using resolve etc, but none of the other options seem to perform as well as the Ultimatte software.

At the moment for recording I would record straight into my BMPCC 6K or i also use Sony A7iii with a Ninja recorder. I am wondering if the Ultimatte box could sit between the A7 and the Ninja?

Any tips on how I would use the Ultimatte 12 in post would be much appreciated.

The question on sitting between the A7III and the Ninja would be the 8 bit color coming out of that Sony camera. Basically you will be doing all of your color correction using the Ultimatte and what you get into the Ninja would be "baked in". Think of the Ultimatte as a lut Of course after that you can still bring it all into Resolve and tweak it some more.

You are still recording into your camera and so would have "raw" footage. If there were an issue where the client really did not like the final Ultimatte color then you could composite the raw image in post and then color correct things with much more finesse. However that would take tons of time to do so make sure you get the client signify when filming. On that note it's also good to use a bigger client monitor that your Ninja as well as a monitor that can be calibrated.