user root;
worker_processes  auto;
events {
    # Allows up to 1024 connections, can be adjusted
    worker_connections  1024;
}

# RTMP configuration
rtmp {
    server {
        listen 1935; # Listen on standard RTMP port
        chunk_size 8192;

        # This application is to accept incoming stream
        application live {
            live on; # Allows live input
            wait_key on;
            # Once receive stream, transcode for adaptive streaming
            # This single ffmpeg command takes the input and transforms
            # the source into 4 different streams with different bitrate
            # and quality. P.S. The scaling done here respects the aspect
            # ratio of the input.
            exec /opt/hls.sh $name;
        }

        # This application is for splitting the stream into HLS fragments
        application low {
            live on; # Allows live input from above
            hls on; # Enable HTTP Live Streaming
            wait_key on;
            wait_video on;
            hls_cleanup off;
            hls_nested on;
            hls_playlist_length 2100ms;
            hls_fragment 700ms;
            hls_fragment_naming system;

            # Pointing this to an SSD is better as this involves lots of IO
            hls_path /hls;

            # Instruct clients to adjust resolution according to bandwidth
            hls_variant _low BANDWIDTH=288000,RESOLUTION=640x480;
        }

        application src {
            live on; # Allows live input from above
            hls on; # Enable HTTP Live Streaming
            wait_key on;
            wait_video on;
            hls_cleanup off;
            hls_nested on;
            hls_playlist_length 2100ms;
            hls_fragment 700ms;
            hls_fragment_naming system;

            # Pointing this to an SSD is better as this involves lots of IO
            hls_path /hls;

            # Instruct clients to adjust resolution according to bandwidth
            hls_variant _src BANDWIDTH=4096000; # Source bitrate, source resolution
        }
    }
}

http {
    # See http://licson.net/post/optimizing-nginx-for-large-file-delivery/ for more detail
    # This optimizes the server for HLS fragment delivery
    sendfile off;
    tcp_nopush on;
    #aio on;
    directio 512;

    # HTTP server required to serve the player and HLS fragments
    server {
        listen 8080;
        error_log /var/log/nginx/rtmp-error.log;

        location /show {
            types {
                application/vnd.apple.mpegurl m3u8;
            }

            alias /hls;
            add_header Cache-Control no-cache; # Prevent caching of HLS fragments
            add_header Access-Control-Allow-Origin *; # Allow web player to access our playlist
        }
    }
}