Reduce resource usage of spyglass about spyglass

[roamingthings]

It's unusual to have so many processes. How many streams do you have active at the same time?

[bodak]

A single stream (through Mainsail web UI or mobileraker). There is no timelapse or any other monitoring running.

[mryel00]

We can't do anything about that. We are using the picamera2 module and that is spawning that many processes if I'm not completely wrong. There is also another project that can use the module v3: camera-streamer from ayufan but it's need manual compiling and doesn't give much benefits over spyglass for the module v3. In my testings it's generating the same amount of cpu load. So it seems more like an issue corresponding to the hardware of the pi.
The best and simplest solution for now would be to reduce your fps this should lower the cpu usage.

I can understand that you want some kind of automatic throtteling for the stream but that would be a bit harder to implement as I'm not completely sure how to change the fps while the camera is running. The processes are constantly pulling new frames in the background from the camera and decode them. This is generating cpu usage in the background even if you don't have any stream open. At the moment there isn't anything we can do about that sadly except for lowering the fps in your settings.
The only solution I can think of now for the background cpu usage could be something like starting and stopping the camera whenever someone connects or disconnects resulting in a delay before you can see the stream in the webui or mobileraker.