RaspberryPi: IP Cam with substream channels possible?

D0T-C0M

Getting the hang of it
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I'm presently running 2 headless RPi's as dedicated IP Cameras. One is a PiZero with a V2.1 8MP Camera RTSP streaming @720p 30FPS and the other is running a Pi4 with a HQ camera streaming @ 1080p 30FPS. I'm using RASPIVID and No motion detection on the cameras, its all done in my desktop computer. I wanted to setup each camera with a low resolution secondary RTSP substream channel which will greatly reduce my computer's CPU load when no motion is being detected. This will be important as I add more cameras to my system.

I've been searching for hours and haven't read anywhere where someone has done this. All the high end surveillance cams have this very useful option. Please tell me its possible with my Pi Boards.
 
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