Hello openframeworks community,
I wrote a little app with of, which receives osc messages to control the blackmagic ATEM switches.
I also included 2 demo projects.
One is a max/msp/jitter project which allows you to control the atem switch, the other i a demo how to control the switch with Ableton Live.
All apps, sources and documentation can be downloaded here:
https://github.com/telematique/ofAtem
all the best,
telematique