How to setup RTMP server on NanoPC-T4

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1 Introduction

This article gives basic steps on how to use a RK3399 based board under Linux to collect real-time video stream data and push the data to a RTMP server which a user can visit and watch the video stream.
All the steps presented in this article are verifies with the following OS systems:

  • FriendlyCore
  • FriendlyDesktop

2 Setup a RTMP Server

You will use a RK3399 board as a RTMP server. You need to install the nginx and nginx-rtmp-module packages by running the following commands: 

sudo apt-get update
sudo apt-get -y install nginx
sudo apt-get -y remove nginx
sudo apt-get clean
sudo rm -rf /etc/nginx/*
sudo apt-get install -y curl build-essential libpcre3 libpcre3-dev libpcre++-dev zlib1g-dev libcurl4-openssl-dev libssl-dev
sudo mkdir -p /var/www
rm -rf nginx_src
mkdir -p nginx_src
cd nginx_src
NGINXSRC=$PWD
wget http://nginx.org/download/nginx-1.13.8.tar.gz
git clone https://github.com/arut/nginx-rtmp-module.git
(cd nginx-rtmp-module/; git checkout -b ng1.13.8 791b6136f02bc9613daf178723ac09f4df5a3bbf)
tar -zxvf nginx-1.13.8.tar.gz
cd nginx-1.13.8
./configure --prefix=/var/www --sbin-path=/usr/sbin/nginx --conf-path=/etc/nginx/nginx.conf --pid-path=/var/run/nginx.pid --error-log-path=/var/log/nginx/error.log --http-log-path=/var/log/nginx/access.log --with-http_ssl_module --without-http_proxy_module --add-module=$NGINXSRC/nginx-rtmp-module
make
sudo make install

Check nginx's version and whether it is installed: 

nginx -v

3 Configure a RTMP Server

Open and edit the nginx's configuration file: 

sudo vim /etc/nginx/nginx.conf

Append the following lines in the file: 

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

Restart the nginx service and activate its configuration: 

sudo systemctl restart nginx

4 Test RTMP Server

Before you begin to use your RTMP server to get stream data you need to make sure it works: 

gst-launch-1.0 videotestsrc is-live=true ! videoconvert ! x264enc bitrate=1000 tune=zerolatency ! \
    video/x-h264 ! h264parse ! video/x-h264 ! queue ! flvmux streamable=true name=mux ! \
    rtmpsink sync=false location='rtmp://192.168.1.122:1935/live/test'

Under Ubuntu run the following rtmpdump command to retrieve stream data: 

rtmpdump -r "rtmp://192.168.1.122/live/test" -V -z -o out.flv

If it can get data continuously and the output file out.flv can be played it means your RTMP server works.

5 Push Pictures Captured by OV13850 Camera to RMTP Server

下面给出两个命令，一个是仅有图像没有声音，另一个是直播带有音频的图像。
仅有图像没有声音： 

gst-launch-1.0 rkisp io-mode=4 device=/dev/video0 ! \
    video/x-raw,format=NV12,width=1280,height=720,framerate=30/1 ! queue ! mpph264enc ! h264parse ! \
    flvmux streamable=true ! queue ! \
    rtmpsink sync=false location='rtmp://192.168.1.122:1935/live/test'

有图像有声音： 

gst-launch-1.0 rkisp io-mode=4 device=/dev/video0 ! \
    video/x-raw,format=NV12,width=1280,height=720,framerate=30/1 ! queue ! mpph264enc ! h264parse ! \
    flvmux name=mux streamable=true alsasrc device=hw:0 ! queue ! \
    audioresample ! audio/x-raw,rate=48000 ! \
    queue ! voaacenc bitrate=32000 ! aacparse ! queue ! mux. mux. ! \
    rtmpsink sync=false location='rtmp://192.168.1.122:1935/live/test'

6 推送罗技C922 Pro摄像头图像到RMTP服务器

6.1 查询USB摄像头节点

用以下命令查看一下USB摄像头的设备节点: 

uvcdynctrl -l

我们测试的罗技摄像头是C922 Pro，从结果中可以获知我们可以通过 /dev/video8 获取它的图像： 

  video8   C922 Pro Stream Webcam

6.2 查询USB摄像头所支持的格式

安装所需工具： 

sudo apt install v4l-utils

下面的命令将查询摄像头所支持的格式，在RK3399平台，只需关注MJPG格式相关的分辨率和帧率： 

sudo v4l2-ctl --list-formats-ext -d /dev/video8

注意，设备节点在你的板子上可能不是/dev/video8，你需要检查一下。

6.3 直播USB摄像头图像

用以下命令： 

gst-launch-1.0 v4l2src device=/dev/video8 ! "image/jpeg,width=1280,height=720,framerate=30/1" ! jpegdec ! videoconvert ! queue ! mpph264enc ! queue ! h264parse ! flvmux streamable=true ! queue ! rtmpsink sync=false location='rtmp://192.168.1.122:1935/live/test'

7 播放视频流

7.1 在手机上播放

如果手机用的是 iPhone，可以安装一个名为SLDP Player的免费软件，在软件上添加流地址 rtmp://192.168.1.122/live/test 即可查看实时图像：
Rk3399-iphone-rtmp.jpg

7.2 通过页面播放

我们将创建一个播放页面，目的是只需用浏览器打开网址 http://开发板的IP地址， 即可浏览直播画面，下面是创建这个播放页面的方法: 

mkdir -p ~/strobe_src
cd ~/strobe_src
wget http://downloads.sourceforge.net/project/smp.adobe/Strobe%20Media%20Playback%201.6%20Release%20%28source%20and%20binaries%29/StrobeMediaPlayback_1.6.328-full.zip
unzip StrobeMediaPlayback_1.6.328-full.zip
sudo cp -r for\ Flash\ Player\ 10.1 /var/www/html/strobe

编辑 /var/www/html/index.html， 填入如下内容，记得把下面的“开发板的IP地址”替换成你的实际的IP地址， IP地址可以通过 ifconfig 命令查看： 

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
    <head>
    <title>NanoPi Live</title>
    <script type="text/javascript" src="strobe/lib/swfobject.js"></script>
    <script type="text/javascript"> 
        // Create a StrobeMediaPlayback configuration 
        var parameters = {  
        // src: "http://players.edgesuite.net/videos/big_buck_bunny/bbb_448x252.mp4",  
        src: "rtmp://192.168.1.122/live/test", 
        autoPlay: true,  
            controlBarAutoHide: false,  
            playButtonOverlay: true,  
            showVideoInfoOverlayOnStartUp: false,  
            optimizeBuffering : false,  
            initialBufferTime : 0.1,  
            expandedBufferTime : 0.1,  
            minContinuousPlayback : 0.1,  
            poster: "strobe/images/poster.png"
        };  
 
        // Embed the player SWF:            
        swfobject.embedSWF
        ( "strobe/StrobeMediaPlayback.swf"
            , "strobeMediaPlayback"
            , 640
            , 480
            , "10.1.0"
            , {}
            , parameters
            , { allowFullScreen: "true"}
            , { name: "strobeMediaPlayback" }
        );
    </script>   
    </head>
    <body>
        <div id="strobeMediaPlayback">
          <p>Alternative content</p>
        </div>
    </body>
</html>

最后，在电脑上用浏览器打开网址 http://开发板的IP地址 即可进入播放界面，如下图所示：
Rk3399-rtmp.png

8 推送至斗鱼直播平台

GStreamer推送命令中的 location 参数是用来设定采集到的视频流推向哪里，通过设定这个参数可以将视频流推向任何支持 RTMP 协议的服务器。
斗鱼平台同样采用了 RTMP 协议传输直播视频，下面以斗鱼平台为例来说明一下推流到斗鱼的方法。

首先获取斗鱼的 RTMP 推流地址, 开启了直播室之后可以获得推流码，所下所示:
Douyu-location.png
把这两个参数组合起来（中间加上/）就是完整的地址： 

rtmp://send3a.douyu.com/live/6012223rbUbZVVtN?wsSecret=221975cd093c763ab688f17ba8a7eb63&wsTime=5bf5315e&wsSeek=off&wm=0&tw=0

将完整的地址赋给location参数即可，命令示例如下： 

gst-launch-1.0 rkisp io-mode=4 device=/dev/video8 ! \
    video/x-raw,format=NV12,width=1280,height=720,framerate=30/1 ! queue ! mpph264enc ! h264parse ! \
    flvmux name=mux streamable=true alsasrc device=hw:0 ! queue ! \
    audioresample ! audio/x-raw,rate=48000 ! \
    queue ! voaacenc bitrate=32000 ! aacparse ! queue ! mux. mux. ! \
    rtmpsink sync=false location='rtmp://send3a.douyu.com/live/6012223rbUbZVVtN?wsSecret=221975cd093c763ab688f17ba8a7eb63&wsTime=5bf5315e&wsSeek=off&wm=0&tw=0'

Douyu-live.png

9 其他

9.1 FriendlyDesktop取消自动锁屏

sudo apt-get -y remove light-locker

9.2 查看音频设备

aplay -L
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