A nginx configuration adding an RTMP server for collection of multiple streams from the local network It will be modified to add a number of other features in due time and was forked for preservation.

nginx_rtmp.conf

rtmp {

    server {
        
        listen 0.0.0.0:1935;
        
        chunk_size 4096;
        
        # The collection server, streaming allowed from standard local /16 subnets
        # Stream to rtmp://<server ip>/collect/<stream key>
        # Playing is allowed from all addresses using the same rtmp URL
        application collect {
            
            live on;
            record off;
            
            allow publish 127.0.0.0/16;
            allow publish 192.168.0.0/16;
            allow publish 10.0.0.0/16;
            allow publish 172.16.0.0/16;
            deny publish all;
            
            allow play all;
            
            # can be used to directly bridge a single stream from the collection to the publishing server
            #push "rtmp://localhost/publish/bridge";
        }
        
        # Publishing server that will publish to streaming site (e.g. twitch) and/or record to disk
        # Streaming to this application is only allowed from local addresses
        application publish {
            
            live on;
            record off;
            
            allow publish 127.0.0.0/16;
            deny publish all;
            
            allow play all;
            
            push "rtmp://live-fra.twitch.tv/app/<stream key>";
        }
    }
}

In it's current state, it helps act as a base to other functions hoping to be achieved and will be modified in due time