How can I create a live multi-camera streaming view for all my amcrest security cameras (without ffmpeg)?

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Might be worth having a look at Motion Eye, there was an addon just released, or you can install in manually, you can then use that to view everything in a side panel. Screenshots · motioneye-project/motioneye Wiki · GitHub

I run it on a dedicaded machine, but I am running 20fps, 800x600, 7 camera’s, but with smaller settings, should run ok on the pi.