Frigate looks good, I may need to learn about docker to package up my system.
From my experience over the past few years the idea of using some simple "motion detection" to crop out a region to be sent to the object detector, while logical, may in fact be counter productive. I run 7 4K cameras and 7 1080p cameras and I just resize the full image to the object detector size and run it. Counter-intuitively it works exceptionally well.
Here is a non-alert detection, rejected because the object being outside the borders of my property:
Like Frigate, I use a Coral TPU and MobilenetSSD_v2_coco, the biggest limitation is decoding multiple rtsp streams.
A Jetson Nano with Coral TPU can process five 3 fps 4K cameras and hit an aggregate frame rate of 14.6 fps -- effectively running the AI on every frame.
My design goal was very different, I consider the 24/7 video recording problem solved by things like Zoneminder, Motion, Motioneye, etc, in the open source world and many reasonably priced commercial offerings, I wanted the AI to monitor the video streams and alert only when a person is detected on my property and work with an recording setup than can forward me the rtsp streams or image snapshots.
While I fully understand Bart's dedication to node-red and DIY, I wish he'd focus his magnificent talent on something other than re-inventing this particular wheel.
I do welcome a thread to clarify how to install and use Kevin's magnificent work, as making this easier to use opens up a lot of possibilities. I've been following it but not had time to actually play with it and its development has been so rapid and dynamic I've lost track of how to actually get started beyond a couple of Krambriw's sample flows and sub-flows that I've saved.
My final point is that monitoring live security camera feeds is incredibly boring so much so that I never look at them unless something has happened at which point the AI person detection images provide a great index into where the video might actually be interesting. A few days ago our mail carrier was attacked a block away from my house, luckily she escaped unharmed, but I reviewed my street facing camera video in hopes I could get a good high quality image of the fleeing suspect, no such luck, as apparently he went in the opposite direction, but I did see several police cars circling the neighborhood looking for the perp. I never knew any of this had happened until yesterday.