I think I've settled on using three Panasonic AW HE-40 cameras for my streaming setup for vMix. When the Panasonic representative demonstrated the camera, he noted that a tally light (a pretty bright LED) is on the front of the camera. He said it could be enabled using either the network interface or the serial interface.

What would it take to configure vMix to send the appropriate signals to the camera over the IP network interface?
Has anyone done this?

Henny,

Thank you for your response.

I am familiar with the specification that you referenced. Polling would put a lot of overhead on the web service.

I wasn't sure if there was a way to use vMix activators or the tally light interface (since it connects to xKeys, Arduino, and tally-lights.com) in some manner to send a cgi command. Perhaps, I just need to get an Arduino and write code to send the appropriate CGI commands based on messages received over the serial bus to the Arduino.

~S