流媒体技术学习笔记之（三）Nginx-Rtmp-Module统计某频道在线观看流的客户数

 获得订阅者人数，可以方便地显示观看流的客户数。

查看已经安装好的模块

/usr/local/nginx/sbin/nginx -V

安装从源编译Nginx和Nginx-RTMP所需的工具

sudo apt-get install build-essential libpcre3 libpcre3-dev libssl-dev

下载Nginx和Nginx-RTMP源码

wget http://nginx.org/download/nginx-1.7.5.tar.gz
wget https://github.com/arut/nginx-rtmp-module/archive/master.zip

提取Nginx和Nginx-RTMP源

tar -zxvf nginx-1.7.5.tar.gz
unzip master.zip

切换到Nginx目录

cd nginx-1.7.5

添加Nginx将编译的模块,包括Nginx-RTMP

./configure --prefix=/usr/local/nginx --user=www --group=www --with-http_ssl_module --with-http_xslt_module --with-http_flv_module --with-debug --with-http_gzip_static_module --add-module=../nginx-rtmp-module-master

提示错误：

./configure: error: the HTTP XSLT module requires the libxml2/libxslt
libraries. You can either do not enable the module or install the libraries.

配置 --with-http_xslt_module 时提示 the HTTP XSLT module requires the libxml2/libxslt libraries：安装一下扩展

sudo apt-get install libxml2 libxml2-dev libxslt-dev

编译和安装Nginx与Nginx-RTMP。

make
sudo make install

安装Nginx初始化脚本

sudo wget https://raw.github.com/JasonGiedymin/nginx-init-ubuntu/master/nginx -O /etc/init.d/nginx
sudo chmod +x /etc/init.d/nginx
sudo update-rc.d nginx defaults

启动和停止Nginx生成配置文件

sudo service nginx start
sudo service nginx stop

观看安装是否成功：

/usr/local/nginx/sbin/nginx -V

安装结果

configure arguments: --prefix=/usr/local/nginx --user=www --group=www --with-http_ssl_module --with-http_xslt_module --with-http_flv_module --with-debug --with-http_gzip_static_module --add-module=../nginx-rtmp-module-master

修改Nginx 配置文件添加一下信息，在位置设置统计信息页面

location /stat {
    rtmp_stat all;
    allow 127.0.0.1;
}

创建一个简单的xsl样式表nclients.xsl提取流用户数

<xsl:stylesheet version="1.0" xmlns:xsl="http://www.w3.org/1999/XSL/Transform">

<xsl:output method="html"/>

<xsl:param name="app"/>
<xsl:param name="name"/>

<xsl:template match="/">
    <xsl:value-of select="count(//application[name=$app]/live/stream[name=$name]/client[not(publishing) and flashver])"/>
</xsl:template>

</xsl:stylesheet>

设置一个返回订阅者数量的位置

location /nclients {
    proxy_pass http://127.0.0.1/stat;
    xslt_stylesheet /home/www/nclients.xsl app='$arg_app' name='$arg_name';
    add_header Refresh "3; $request_uri";
}

Nginx.config 完整配置：

user www www;
worker_processes  1;

error_log  logs/error.log  debug;

#pid        logs/nginx.pid;

events {
    worker_connections  65535;
}

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

    log_format  main  '[$time_local][$remote_addr][$http_x_forwarded_for] $status "$request" "$http_referer" "$http_user_agent"';

    access_log  logs/access.log  main;

    sendfile        on;
    keepalive_timeout  65;

    server {

        set  $wwwroot  /home/www/node/html;

        listen       80;
        server_name  localhost;
        index        index.html;
        root         $wwwroot;
        access_log   logs/node.access.log  main;
        error_log    logs/error.log debug;

        location /rtmp/stat {
            rtmp_stat all;
            rtmp_stat_stylesheet rtmpstat.xsl;
        }

        location /rtmpstat.xsl {
        }

        location /rtmp/control {
            rtmp_control all;
        }

        location /stat {
                rtmp_stat all;
                allow 127.0.0.1;
        }

        location /nclients {
            proxy_pass http://127.0.0.1/stat;
            xslt_stylesheet /home/www/nclients.xsl app='$arg_app' name='$arg_name';
            add_header Refresh "3; $request_uri";
        }

        location ~* /hls/.*\.m3u8$ {
            types {
                application/vnd.apple.mpegurl m3u8;
            }
            root /tmp;
            add_header Cache-Control no-cache;
            add_header Access-Control-Allow-Origin *;
        }

        location ~* /hls/.*\.ts$ {
            types {
                video/mp2t ts;
            }
            root /tmp;
            expires    1m;
            add_header Cache-Control public;
            add_header Access-Control-Allow-Origin *;
        }

        #error_page  404              /404.html;

        error_page   500 502 503 504  /50x.html;
        location = /50x.html {
            root   html;
        }

        location / {

        }

    }

}

rtmp {
    server {
        listen 1935;
        chunk_size 4096;
        application live {
        live on;
        record off;
    　　}
    }
}

重启Nginx

root@iZ239kcyg8rZ:/usr/local/nginx/conf# service nginx restart
 * Stopping Nginx Server...                                                                                                                                                           [ OK ]
 * Starting Nginx Server...                                                                                                                                                           [ OK ]
root@iZ239kcyg8rZ:/usr/local/nginx/conf# 

根据直播频道访问以下地址：

http://你的推流服务器IP/nclients?app=live&name=4001482820358

客户端打开三个播放测试：

打开2个VLC播放流：

 查看在线人数：

 结束。