Turn on lights, cameras, PC, and Atem Mini Extreme.
Ensure Camera 1 is in the Preview screen (button is green) and the PC (button 5) is in Program (button is red).
On the desktop, run the ATEM Software Control.
In the Palettes tab, select Upstream Key 1 and the Chroma tab.
For the Fill Source, select Camera 1.
Click the radio button Chroma Sample.
You will see a dotted rectangle in the preview screen. Use the mouse to move the rectangle to an area of green. You can use the slider to increase or decrease the size of the rectangle. Try to find an area that is not too bright or too dark.
You can click the Preview button to see how well it your video is keying.
To turn on keying, click on the KEY 1 ON button on the ATEM panel.
