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raspberry_ninja
Publish or capture VDO.Ninja streams with Python (Raspberry Pi, Linux, Mac, Windows WSL)
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InfluxDB
Power Real-Time Data Analytics at Scale. Get real-time insights from all types of time series data with InfluxDB. Ingest, query, and analyze billions of data points in real-time with unbounded cardinality.
If you want to keep adding additional cameras, and have a limited budget, I have the Raspberry_ninja project in development (https://github.com/steveseguin/raspberry_ninja), which allows you to turn a $15 Rasbperry Pi computer into a video encoder, that can publish video from a cheap camera, webcam, or HDMI adapter to VDO.Ninja. Cheaper than buying a bunch of phones, although it's still a work in progress.
NOTE:
The number of mentions on this list indicates mentions on common posts plus user suggested alternatives.
Hence, a higher number means a more popular project.