This video shows how to setup a Raspberry Pi as a RTMP live video streaming server. The video also shows how to stream from multiple GoPro cameras using the server.
You can find all commands here: https://www.cameraremote.de/how-to-se...
Camera Tools for GoPro: https://www.toolsforgopro.com/camerat...
Live Streamer for GoPro: https://www.toolsforgopro.com/live