NGINX RTMP Configurations

nginx.conf

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 4000; 

        # This application is to accept incoming stream
        application live {
            live on; # Allows live input

            # 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 ffmpeg -i rtmp://192.168.1.68/live/$name -async 1 -vsync -1 
            -c:v libx264 -c:a libfdk_aac -b:v 256k -b:a 32k -vf "scale=480:trunc(ow/a/2)*2" -tune zerolatency -preset veryfast -crf 23 -f flv rtmp://192.168.1.68/show/$name_low
            -c:v libx264 -c:a libfdk_aac -b:v 768k -b:a 96k -vf "scale=720:trunc(ow/a/2)*2" -tune zerolatency -preset veryfast -crf 23 -f flv rtmp://192.168.1.68/show/$name_mid
            # -c:v libx264 -c:a libfdk_aac -b:v 1024k -b:a 128k -vf "scale=960:trunc(ow/a/2)*2" -tune zerolatency -preset veryfast -crf 23 -f flv rtmp://192.168.1.68/show/$name_high
            -c:v libx264 -c:a libfdk_aac -b:v 1920k -b:a 128k -vf "scale=1280:trunc(ow/a/2)*2" -tune zerolatency -preset veryfast -crf 23 -f flv rtmp://192.168.1.68/show/$name_hd720
            -c copy -f flv rtmp://192.168.1.68/show/stream;
        }
        
        # This application is for splitting the stream into HLS fragments
        application show {
            live 		on; 	# Allows live input from above
            hls 		on; 	# Enable HTTP Live Streaming
	        # hls_fragment	5s;

            # Pointing this to an SSD is better as this involves lots of IO
            hls_path /tmp/hls/;
            
            # Instruct clients to adjust resolution according to bandwidth
            hls_variant _low BANDWIDTH=288000; # Low bitrate, sub-SD resolution
            hls_variant _mid BANDWIDTH=448000; # Medium bitrate, SD resolution
            # hls_variant _high BANDWIDTH=1152000; # High bitrate, higher-than-SD resolution
            hls_variant _hd720 BANDWIDTH=2048000; # High bitrate, HD 720p resolution
            # 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;
    directio 512;
    
    # HTTP server required to serve the player and HLS fragments
    server {
        listen 80;
        error_log /home/user/build/logs/rtmp.log debug;
        error_log /home/user/build/logs/rtmp-error.log;
        # error_log /home/user/build/logs/rtmp-info.log info;
        # error_log /home/user/build/logs/rtmp-notice.log notice;

        
        location / {
            root html;
        }
        
        location /hls {
            types {
                application/vnd.apple.mpegurl m3u8;
            }
            
            root /tmp/;
            add_header Cache-Control no-cache; # Prevent caching of HLS fragments
            add_header Access-Control-Allow-Origin *; # Allow web player to access our playlist
        }
    }
}