树莓派3-摄像头-视频软件mjpg-streamer的安装使用

概要

• "MJPG-streamer"，是用于从webcam摄像头采集图像，把他们以流的形式通过基于ip的网络传输到浏览器如Firehox，Cambozola，VLC播放器，Windows的移动设备或者其他拥有浏览器的移动设备。她可以利用某些webcams的硬件压缩功能来降低服务器CPU的开销。她为嵌入式设备和一些常规服务器提供了一个轻量且更少CPU消耗的方案，因为她无需为视频帧压缩浪费大量的计算效率（这件事交给硬件了）。例子是：在一个主频200MHz的路由器上（一个例子是cisco经典无线的linkfs
  WRT54G路由，其可以运行openWRT（迷你linux系统），主频200MHz,4MRAM,16Flash），流编码一个960x720像素的视频，她可以减少10%的cpu使用。
• 官网，https://sourceforge.net/projects/mjpg-streamer/
• 官网，https://github.com/jacksonliam/mjpg-streamer

依赖软件

• libjpeg8
• cmake

安装

1. 安装依赖库

安装libjpeg的dev版本（注：下面所有安装过程中出现是否继续时，统一选择继续：Yes）

sudo apt-get install libjpeg8-dev

2. 下载mjpg-streamer

wget https://github.com/jacksonliam/mjpg-streamer/archive/master.zip
unzip master.zip

3. 编译mjpg-streamer

• 安装cmake

sudo apt-get install cmake

• 切换到mjpg的路径下

cd mjpg-streamer-master/mjpg-streamer-experimental
make
sudo make install 

用法介绍

pi@raspberrypi:~ $ mjpg_streamer --help
-----------------------------------------------------------------------
Usage: mjpg_streamer
  -i | --input "<input-plugin.so> [parameters]"
  -o | --output "<output-plugin.so> [parameters]"
 [-h | --help ]........: display this help
 [-v | --version ].....: display version information
 [-b | --background]...: fork to the background, daemon mode
-----------------------------------------------------------------------
Example #1:
 To open an UVC webcam "/dev/video1" and stream it via HTTP:
  mjpg_streamer -i "input_uvc.so -d /dev/video1" -o "output_http.so"
-----------------------------------------------------------------------
Example #2:
 To open an UVC webcam and stream via HTTP port 8090:
  mjpg_streamer -i "input_uvc.so" -o "output_http.so -p 8090"
-----------------------------------------------------------------------
Example #3:
 To get help for a certain input plugin:
  mjpg_streamer -i "input_uvc.so --help"


-----------------------------------------------------------------------
In case the modules (=plugins) can not be found:
 * Set the default search path for the modules with:
   export LD_LIBRARY_PATH=/path/to/plugins,
 * or put the plugins into the "/lib/" or "/usr/lib" folder,
 * or instead of just providing the plugin file name, use a complete
   path and filename:
   mjpg_streamer -i "/path/to/modules/input_uvc.so"
-----------------------------------------------------------------------

启动mjpg_streamer

• 执行命令：

/usr/local/bin/mjpg_streamer -i "/usr/local/lib/mjpg-streamer/input_uvc.so -n -f 30 -r 1280x720" -o "/usr/local/lib/mjpg-streamer/output_http.so -p 8080 -w /usr/local/share/mjpg-streamer/www"

• 显示如下：

$ /usr/local/bin/mjpg_streamer -i "/usr/local/lib/mjpg-streamer/input_uvc.so -n -f 30 -r 1280x720" -o "/usr/local/lib/mjpg-streamer/output_http.so -p 8080 -w /usr/local/share/mjpg-streamer/www"
MJPG Streamer Version.: 2.0
 i: Using V4L2 device.: /dev/video0
 i: Desired Resolution: 1280 x 720
 i: Frames Per Second.: 30
 i: Format............: JPEG
 i: TV-Norm...........: DEFAULT
 i: The specified resolution is unavailable, using: width 640 height 480 instead 
 i: Could not obtain the requested pixelformat: MJPG , driver gave us: YUYV
    ... will try to handle this by checking against supported formats. 
    ... Falling back to YUV mode (consider using -yuv option). Note that this requires much more CPU power
 o: www-folder-path......: /usr/local/share/mjpg-streamer/www/
 o: HTTP TCP port........: 8080
 o: HTTP Listen Address..: (null)
 o: username:password....: disabled
 o: commands.............: enabled

查看

• 在浏览器http://localhost:8080 打开监控界面