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I've personally been quite pleased with the combination of Frigate and some Amcrest POE cameras. Just make sure the cameras you are getting support RTSP though and you should be able to use them with Frigate.
Also make sure you block the cameras from reaching the public internet using your firewall, and only make them reachable from your Frigate host. Personally I use a VLAN with no internet access and enforce tagging at the switch level (i.e. don't trust the cameras to maintain their own VLAN) settings.
I see several Amcrest options that look like they have integrated AI object detection. Frigate on the other hand says you should get a "Google Coral Accelerator". Do you know if Frigate (or RTSP, I guess) has a way to leverage the built in detection capabilities of a camera (assuming they are built in, and not being offloaded to the cloud)? Or am I better of looking at the "dumb" Amcrest cameras, and just assuming all processing for all cameras will happen on my Frigate hardware?
Coral Acceletor is only needed if you run setup that does not have GPU or enough CPU. Spare laptop usually has enough power to handle AI detection, but RasPi doesn't. I run mine in CPU at rack server.
Cameras own detections are limited in my experience, and it is much harder to integrate to anything else, like HomeAssistant for notification & automation
I know I'm a bit late to the conversation, so I don't know if this is still helpful... But I have a camera with "AI Detection" built into it and it appears to send alerts via its ONVIF connection. I've disabled motion and other detectors on my NVR (AgentNVR) and instead configured it to just wait for an alert from the camera itself to start recording. It's been working quite well.
My initial plan was to use a coral TPU and frigate, but the Coral/Gasket drivers appear to be pretty old and I couldn't get them to work properly, myself.
Thanks, good to know!