That said, it wasn’t clear which version of vMix was appropriate. The trial license is the “Pro” version, which is all-bells-&-whistles enabled. The “Basic” version is free, but limited to SD resolution and the number of inputs that it can accept. The “Basic HD” version, just $60 USD, adds the ability to operate at resolutions up to 1920x1080p.
The company lists the limitation on the “Basic” editions to “4 Total Inputs” and 3 “Capture Inputs.” This terminology is not exactly obvious. So, I began by purchasing the Basic HD license to see if it would meet my needs.