nginx.conf

worker_processes  1;
error_log  logs/error.log debug;

events {
	worker_connections  1024;
}

rtmp {
	server {
		listen 1935;

		application src {
			allow play all;
			live on;

            exec ffmpeg -i rtmp://10.9.21.50:1935/src/$name -async 1 -vsync -1
                        -c:v libx264 -c:a libvo_aacenc -b:v 256k -b:a 32k -vf "scale=480:trunc(ow/a/2)*2" -tune zerolatency -preset veryfast -crf 23 -f flv rtmp://10.9.21.50:1935/live/$name_low
                        -c:v libx264 -c:a libvo_aacenc -b:v 768k -b:a 96k -vf "scale=720:trunc(ow/a/2)*2" -tune zerolatency -preset veryfast -crf 23 -f flv rtmp://10.9.21.50:1935/live/$name_mid
                        -c:v libx264 -c:a libvo_aacenc -b:v 1024k -b:a 128k -vf "scale=960:trunc(ow/a/2)*2" -tune zerolatency -preset veryfast -crf 23 -f flv rtmp://10.9.21.50:1935/live/$name_high
                        -c:v libx264 -c:a libvo_aacenc -b:v 1920k -b:a 128k -vf "scale=1280:trunc(ow/a/2)*2" -tune zerolatency -preset veryfast -crf 23 -f flv rtmp://10.9.21.50:1935/live/$name_hd720
                        -c copy -f flv rtmp://10.9.21.50:1935/live/$name_src;
		}

		application live {
            live on;
            hls on;
            hls_path /tmp/live;
            hls_nested on;
	    hls_fragment 10s;

            hls_variant _low BANDWIDTH=288000; 
            hls_variant _mid BANDWIDTH=448000; 
            hls_variant _high BANDWIDTH=1152000;
            hls_variant _hd720 BANDWIDTH=2048000;
            hls_variant _src BANDWIDTH=4096000;
        }
	}
}


http {
	include       mime.types;
	default_type  application/octet-stream;

	server {
		listen 80;
		server_name 10.9.21.50;

		location /live {
			types {
				application/vnd.apple.mpegurl m3u8;
			}
		alias /tmp/live;
		add_header Cache-Control no-cache;
		}  

		location /stats {
			stub_status;
		}

		location / {
			root   html;
			index  index.html index.htm;
		}   
	}
}