Based on first hand experience, can people recommend various IP cameras 
(ideally an Ethernet or wifi camera) with a focus towards ease of grabbing 
a single frame from a Linux command line?
I'd like to be able to grab single frames to use in the weewx webpage.

I don't want an RaspberryPi camera because I'd like multiple cameras and I 
don't want to be tethered to a RaspberryPi via a short ribbon cable.

I've tested am Ethernet-connected camera that puts out an rtsp stream.  I 
successfully used an ffmpeg command line to start the stream, wait 10 
seconds and then grab a frame.  Sometimes 10 seconds isn't enough and I 
have to try 12-15 seconds.
*ffmpeg -loglevel info -rtsp_transport tcp -i 
"rtsp://192.168.7.51/rtsp-stream" -ss 00:00:10 -r 1 -vframes 1 -y 
/home/weewx/Pictures/image.jpg*
It works, but I don't think rtsp is the ideal transport method for grabbing 
a single frame, because you have to wait about 10+ seconds for the stream 
to fully form a valid image.

I wonder if anyone has tried the ESP32-CAMs?  They get connected to an 
ESP6288 wifi module, and are thus small and wireless.
https://www.amazon.com/ESP32-CAM-Bluetooth-Camera-Module-Development/dp/B07S5PVZKV

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