采集rtsp流摄像头到浏览器实时播放方案

转载自：严健康的个人博客 http://www.yanjiankang.cn/

本文链接地址: http://www.yanjiankang.cn/rtsp_camera_to_web_browser/

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最近在做一个流媒体的项目，项目中需要采集摄像头的视频流到网页界面实时播放，一般ip摄像头的流格式都是rtsp的，虽然可以通过vlc实时播放，但是不如浏览器观看给用户的体验简单。

根据查找的资料和实际的实践，目前发现的切实可行的方案有以下几种（因为项目是采用java开发，因此下面的代码也主要使用java实现）：

1. 使用xuggle库直接解码rtsp流，将解码的一帧帧图片发送给浏览器，使用html5的video播放mjpeg格式，即图片的不断刷新；

2. 使用xuggle库直接解码rtsp流，解码结果直接发送给rtmp服务器，然后浏览器使用flash直接播放rtmp的视频流；

3. ffmpeg直接解码rtsp流，将解码结果使用http发送到nodejs服务器，nodejs服务器使用websocket发送给客户端，客户端使用canvas实时绘制图像；

下面详细介绍这几种方案。

FFmpeg和Xuggle的简介

FFmpeg是一个自由软件，可以运行音频和视频多种格式的录影、转换、流功能，包含了libavcodec——这是一个用于多个项目中音频和视频的解码器库，以及libavformat——一个音频与视频格式转换库。
FFmpeg的安装请参考：ubuntu上安装ffmpeg

xuggle官网是一个开源的资源库，能够让开发者更好的去对视频和音频文件进行解码、编码、以及录制等功能。xuggle是对ffmepg的封装，是一套基于ffmpeg的开发库。 使用非常方便。 在java中使用时，请在eclipse中导入其jar包。 xuggle-5.4-jar包下载

方案一的具体实现

xuggle读取rtsp摄像头的代码如下：
import包如下：

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import com . xuggle . mediatool . IMediaReader ; import com . xuggle . mediatool . MediaListenerAdapter ; import com . xuggle . mediatool . ToolFactory ; import com . xuggle . mediatool . event . IVideoPictureEvent ;

其中：streamLocation是需要读取的rtsp地址

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mediaReader = ToolFactory . makeReader ( streamLocation ) ; mediaReader . setBufferedImageTypeToGenerate ( BufferedImage . TYPE_3BYTE _BGR） ; mediaReader . addListener ( this ) ; while ( mediaReader . readPacket ( ) == null && running ) ; mediaReader . close ( ) ;

上面这段代码实现了rtsp的持续读取，那么读取到的数据怎么获取，很简单，实现以下的帧回调函数onVideoPicture即可。

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/** * Gets called when FFMPEG transcoded a frame */ public void onVideoPicture ( IVideoPictureEvent event ) {      BufferedImage frame = event . getImage ( ) ;      //stream是用户自定义的rtsp视频流的id，例如;streamId = this.hashcode()即可      images . put ( streamId , frame ) ;      frameNr ++ ; }

以上的images是使用guava库的Cache建立的代码如下：

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import com . google . common . cache . Cache ; import com . google . common . cache . CacheBuilder ;   private static Cache < String , BufferedImage > images = null ;

使用html5 video标签+javax.ws.rs实现的网页显示代码如下：

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import java . awt . image . BufferedImage ; import java . io . ByteArrayOutputStream ; import java . io . IOException ; import java . io . OutputStream ; import java . util . HashSet ; import java . util . Set ;   import javax . imageio . ImageIO ; import javax . ws . rs . DefaultValue ; import javax . ws . rs . GET ; import javax . ws . rs . Path ; import javax . ws . rs . PathParam ; import javax . ws . rs . Produces ; import javax . ws . rs . QueryParam ; import javax . ws . rs . WebApplicationException ; import javax . ws . rs . core . Application ; import javax . ws . rs . core . Response ; import javax . ws . rs . core . StreamingOutput ;   import org . slf4j . Logger ; import org . slf4j . LoggerFactory ;   import com . google . common . cache . Cache ; import com . sun . jersey . api . container . httpserver . HttpServerFactory ; import com . sun . jersey . api . core . ApplicationAdapter ; import com . sun . net . httpserver . HttpServer ;   /** * A simple webservice used to view results MJPEG streams. * The webservice supports a number of calls different calls: * <ol> * <li>http://IP:PORT/streaming/streams : lists the available JPG and MJPEG urls * </li> * <li>http://IP:PORT/streaming/picture/{streamid}.jpg : url to grab jpg * pictures</li> * <li>http://IP:PORT/streaming/tiles : provides a visual overview of all the * streams available at this service. Clicking an image will open the mjpeg * stream</li> * <li>http://IP:PORT/streaming/mjpeg/{streamid}.mjpeg : provides a possibly * never ending mjpeg formatted stream</li> * </ol> * * The service runs on port 8558 by default but this can be changed by using the * port(int) method. * * @author Corne Versloot * */   @ Path ( "/streaming" ) public class MjpegStreamingOp extends Application {        private static Cache < String , BufferedImage > images = null ;      private Logger logger = LoggerFactory . getLogger ( getClass ( ) ) ;      private HttpServer server ;      private int port = 8558 ;      private int frameRate = 20 ;    // this parameter decide the sleep time        public MjpegStreamingOp port ( int nr ) {          this . port = nr ;          return this ;      }        public MjpegStreamingOp framerate ( int nr ) {          this . frameRate = nr ;          return this ;      }        public void prepare ( ) throws IllegalArgumentException , IOException {          //此处需要修改为从rtsp读进来的images存放的类          images = TCPClient . getImages ( ) ;          ApplicationAdapter connector = new ApplicationAdapter (                  new MjpegStreamingOp ( ) ) ;          server = HttpServerFactory . create ( "http://localhost:" + port + "/" ,                  connector ) ;          server . start ( ) ;      }        /**      * Sets the classes to be used as resources for this application      */      public Set < Class <? >> getClasses ( ) {          Set < Class <? > > s = new HashSet < Class < ? >> ( ) ;          s . add ( MjpegStreamingOp . class ) ;          return s ;      }        public void deactivate ( ) {          server . stop ( 0 ) ;          images . invalidateAll ( ) ;          images . cleanUp ( ) ;      }        @ GET      @ Path ( "/streams" )      @ Produces ( "text/plain" )      public String getStreamIds ( ) throws IOException {          String result = new String ( ) ;          for ( String id : images . asMap ( ) . keySet ( ) ) {              result += "/streaming/picture/" + id + ".jpeg\r\n" ;          }          System . out . println ( "\r\n" ) ;          for ( String id : images . asMap ( ) . keySet ( ) ) {              result += "/streaming/mjpeg/" + id + ".mjpeg\r\n" ;          }          return result ;      }        @ GET      @ Path ( "/picture/{streamid}.jpeg" )      @ Produces ( "image/jpg" )      public Response jpeg ( @ PathParam ( "streamid" ) final String streamId ) {          BufferedImage image = null ;          if ( ( image = images . getIfPresent ( streamId ) ) != null ) {              ByteArrayOutputStream baos = new ByteArrayOutputStream ( ) ;              try {                  ImageIO . write ( image , "jpg" , baos ) ;                  byte [ ] imageData = baos . toByteArray ( ) ;                  return Response . ok ( imageData ) . build ( ) ; // non streaming                  // return Response.ok(new                  // ByteArrayInputStream(imageDAta)).build(); // streaming              } catch ( IOException ioe ) {                  logger . warn ( "Unable to write image to output" , ioe ) ;                  return Response . serverError ( ) . build ( ) ;              }          } else {              return Response . noContent ( ) . build ( ) ;          }      }        @ GET      @ Path ( "/playmultiple" )      @ Produces ( "text/html" )      public String showPlayers ( @ DefaultValue ( "3" ) @ QueryParam ( "cols" ) int cols ,              @ DefaultValue ( "0" ) @ QueryParam ( "offset" ) int offset ,              @ DefaultValue ( "6" ) @ QueryParam ( "number" ) int number )              throws IOException {          // number = Math.min(6, number);          String result = "<html><head><title>Mjpeg stream players                         </title></head><body bgcolor=\"#3C3C3C\">" ;          result += "<font style=\"color:#CCC;\">Streams: " + images . size ( )                  + " (showing " + offset + " - "                  + Math . min ( images . size ( ) , offset + number ) + ")</font><br/>" ;          result += "<table style=\"border-spacing:0;                    border-collapse: collapse;\"><tr>" ;          int videoNr = 0 ;          for ( String id : images . asMap ( ) . keySet ( ) ) {              if ( videoNr < offset ) {                  videoNr ++ ;                  continue ;              }              if ( videoNr - offset > 0 && ( videoNr - offset ) % cols == 0 ) {                  result += "</tr><tr>" ;              }              result += "<td><video poster=\"mjpeg/"                      + id                      + ".mjpeg\">"                      + "Your browser does not support the video tag.</video></td>" ;              // result +=              // "<td><img src=\"http://"+InetAddress.getLocalHost().getHostAddress()                              + ":" + port + "/streaming/mjpeg/" + id + ".mjpeg\"></td>" ;              if ( videoNr > offset + number )                  break ;              videoNr ++ ;          }          result += "</tr></table></body></html>" ;          return result ;      }        @ GET      @ Path ( "/play" )      @ Produces ( "text/html" )      public String showPlayers ( @ QueryParam ( "streamid" ) String streamId )              throws IOException {          String result = "<html><head><title>Mjpeg stream: " + streamId                  + "</title></head><body bgcolor=\"#3C3C3C\">" ;          result += "<font style=\"color:#CCC;\"><a href=\"tiles\">Back</a></font><br/>" ;          result += "<table style=\"border-spacing:0; border-collapse: collapse;\"><tr>" ;          result += "<video poster=\"mjpeg/" + streamId + ".mjpeg\">"                  + "Your browser does not support the video tag.</video>" ;          return result ;      }        @ GET      @ Path ( "/tiles" )      @ Produces ( "text/html" )      public String showTiles ( @ DefaultValue ( "3" ) @ QueryParam ( "cols" ) int cols ,              @ DefaultValue ( "-1" ) @ QueryParam ( "width" ) float width )              throws IOException {          String result = "<html><head><title>Mjpeg stream players</title>" ;          result += "</head><body bgcolor=\"#3C3C3C\">" ;            result += "<table style=\"border-spacing:0; border-collapse: collapse;\"><tr>" ;          int videoNr = 0 ;          for ( String id : images . asMap ( ) . keySet ( ) ) {              if ( videoNr > 0 && videoNr % cols == 0 ) {                  result += "</tr><tr>" ;              }              result += "<td><a href=\"play?streamid=" + id                      + "\"><img src=\"picture/" + id + ".jpeg\" "                      + ( width > 0 ? "width=\"" + width + "\"" : "" ) + "/></a>" ;              videoNr ++ ;          }          result += "</tr></table></body></html>" ;          return result ;      }        @ GET      @ Path ( "/mjpeg/{streamid}.mjpeg" )      @ Produces ( "multipart/x-mixed-replace; boundary=--BoundaryString\r\n" )      public Response mjpeg ( @ PathParam ( "streamid" ) final String streamId ) {          StreamingOutput output = new StreamingOutput ( ) {              private BufferedImage prevImage = null ;              private int sleep = 1000 / frameRate ;                @ Override              public void write ( OutputStream outputStream ) throws IOException ,                      WebApplicationException {                  BufferedImage image = null ;                  try {                      while ( ( image = images . getIfPresent ( streamId ) ) != null )                          if ( prevImage == null || ! image . equals ( prevImage ) ) {                              ByteArrayOutputStream baos = new ByteArrayOutputStream ( ) ;                              ImageIO . write ( image , "jpg" , baos ) ;                              byte [ ] imageData = baos . toByteArray ( ) ;                              outputStream                                      . write ( ( "--BoundaryString\r\n"                                              + "Content-type: image/jpeg\r\n"                                              + "Content-Length: "                                              + imageData . length + "\r\n\r\n" )                                              . getBytes ( ) ) ;                              outputStream . write ( imageData ) ;                              outputStream . write ( "\r\n\r\n" . getBytes ( ) ) ;                              outputStream . flush ( ) ;                          }                          Thread . sleep ( sleep ) ;                      }                      outputStream . flush ( ) ;                      outputStream . close ( ) ;                  } catch ( IOException ioe ) {                      logger . info ( "Steam for [" + streamId                              + "] closed by client!" ) ;                  } catch ( InterruptedException e ) {                      e . printStackTrace ( ) ;                  }              }          } ;          return Response . ok ( output ) . header ( "Connection" , "close" )                  . header ( "Max-Age" , "0" ) . header ( "Expires" , "0" )                  . header ( "Cache-Control" , "no-cache, private" )                  . header ( "Pragma" , "no-cache" ) . build ( ) ;      } }

以上代码参考自github上stormcv项目，项目地址为：https://github.com/sensorstorm/StormCV, 感谢原作者。

至此，打开网页 http://localhost:8558/streaming/tiles 即可查看到实时视频。

方案二的具体实现

xuggle库转rtsp为rtmp

rtsp的reader：

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import org . slf4j . Logger ; import org . slf4j . LoggerFactory ; import com . xuggle . mediatool . IMediaReader ; import com . xuggle . mediatool . MediaListenerAdapter ; import com . xuggle . mediatool . ToolFactory ; import com . xuggle . mediatool . event . IVideoPictureEvent ; import com . xuggle . xuggler . ICodec ; import com . xuggle . xuggler . IContainer ; import com . xuggle . xuggler . IVideoPicture ;   /** * This class reads a video stream or file, decodes frames and transcode to rtmp stream * @author jkyan */ public class RTSPReader extends MediaListenerAdapter implements Runnable {      private Logger logger = LoggerFactory . getLogger ( RTSPReader . class ) ;      private IMediaReader mediaReader ;      private int frameSkip ;      private int groupSize ;      private long frameNr ; // number of the frame read so far      private boolean running = false ;      // used to determine if the EOF was reached if Xuggler does not detect it      private long lastRead = - 1 ;      private int sleepTime = 0 ;        private String streamName ;      private String streamLocation = null ;      private RTMPWriter rtmpWriter = null ;      Double frameRate = 0.0 ;        // frameskip和groupsize决定了需要读取的帧的数目，即采样率，      // 例如，1,1时代表每一帧都需要读取，10,5时代表只需要[0 1 2 3 4] [10 11 12 13 14] ...      public RTSPReader ( String streamName , String streamLocation ,          int frameSkip , int groupSize , int sleepTime ) {          this . streamLocation = streamLocation ;          this . frameSkip = Math . max ( 1 , frameSkip ) ;          this . groupSize = Math . max ( 1 , groupSize ) ;          this . sleepTime = sleepTime ;          this . streamName = streamName ;          lastRead = System . currentTimeMillis ( ) + 10000 ;      }        /**      * Start reading the provided URL      */      public void run ( ) {          running = true ;          while ( running ) {              try {                  // if a url was provided read it                  if ( streamLocation != null ) {                      logger . info ( "Start reading stream: " + streamLocation ) ;                      mediaReader = ToolFactory . makeReader ( streamLocation ) ;                      lastRead = System . currentTimeMillis ( ) + 10000 ;                      frameNr = 0 ;                      rtmpWriter = new RTMPWriter ( 576 , 704 , 30.0 , streamName ) ;                      mediaReader . addListener ( this ) ;                      while ( mediaReader . readPacket ( ) == null && running ) ;                      // reset internal state                      rtmpWriter . setFinish ( ) ;                      mediaReader . close ( ) ;                  } else {                      logger . error ( "No stream provided, nothing to read" ) ;                      break ;                  }              } catch ( Exception e ) {                  logger . warn ( "Stream closed unexpectatly: " + e . getMessage ( ) , e ) ;                  // sleep a minute and try to read the stream again                  sleep ( 60 * 1000 ) ;              }          }          running = false ;      }        public void sleep ( int ms ) {          try {              Thread . sleep ( ms ) ;          } catch ( InterruptedException e ) {              e . printStackTrace ( ) ;          }      }        /**      * Gets called when FFMPEG transcoded a frame      */      public void onVideoPicture ( IVideoPictureEvent event ) {          lastRead = System . currentTimeMillis ( ) ;          if ( frameNr % frameSkip < groupSize ) {              IVideoPicture picture = event . getPicture ( ) ;              rtmpWriter . write ( frameNr , picture ) ;              // enforced throttling              if ( sleepTime > 0 )                  sleep ( sleepTime ) ;          }          frameNr ++ ;      }        /**      * Tells the StreamReader to stop reading frames      */      public void stop ( ) {          running = false ;      }        /**      * Returns whether the StreamReader is still active or not      * @return      */      public boolean isRunning ( ) {          // kill this thread if the last frame read is to long ago          // (means Xuggler missed the EoF) and clear resources          if ( lastRead > 0 && System . currentTimeMillis ( ) - lastRead > 3000 ) {              running = false ;              if ( mediaReader != null && mediaReader . getContainer ( ) != null )                  mediaReader . getContainer ( ) . close ( ) ;              return this . running ;          }          return true ;      } }

rtmp服务器的搭建方法请参考这里。

rtmp的writer：

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import com . xuggle . xuggler . ICodec ; import com . xuggle . xuggler . IContainer ; import com . xuggle . xuggler . IContainerFormat ; import com . xuggle . xuggler . IPacket ; import com . xuggle . xuggler . IPixelFormat ; import com . xuggle . xuggler . IRational ; import com . xuggle . xuggler . IStream ; import com . xuggle . xuggler . IStreamCoder ; import com . xuggle . xuggler . IVideoPicture ; import java . util . Collection ; import java . util . Iterator ; import javax . management . RuntimeErrorException ; import org . slf4j . Logger ; import org . slf4j . LoggerFactory ;   public class RTMPWriter {      private Logger logger = LoggerFactory . getLogger ( RTMPWriter . class ) ;      // private static String url = "";      private String url = "rtmp://localhost:1935/live1/" ;      private String appName = "" ;      private int height = 0 ;      private int width = 0 ;      private IStreamCoder coder = null ;      private IContainer container = null ;      private Boolean isfinish = false ;        //rtmp writer中需要获取rtsp流图像的宽和高，帧频作为编码参数      //rtmp服务器的地址格式一般为：ip+端口+地址+应用名称      @ SuppressWarnings ( "deprecation" )      public RTMPWriter ( int height , int width , double frameRate , String appName ) {          container = IContainer . make ( ) ;          IContainerFormat containerFormat = IContainerFormat . make ( ) ;          containerFormat . setOutputFormat ( "flv" , url + appName , null ) ;          // set the buffer length xuggle will suggest to ffmpeg for reading inputs          container . setInputBufferLength ( 0 ) ;          int retVal = container . open ( url + appName , IContainer . Type . WRITE ,                  containerFormat ) ;          if ( retVal < 0 ) {              logger . error ( "Could not open output container for live stream" ) ;          } else {              logger . info ( "hava opened server " + url + appName + " for write!" ) ;          }          IStream stream = container . addNewStream ( 0 ) ;          coder = stream . getStreamCoder ( ) ;          ICodec codec = ICodec . findEncodingCodec ( ICodec . ID . CODEC_ID_H264 ) ;          if ( codec == null ) {              logger . warn ( "cannot find h264 encoding codec!" ) ;              Collection < ICodec > icodec_collections = ICodec . getInstalledCodecs ( ) ;              Iterator < ICodec > iterator = icodec_collections . iterator ( ) ;              while ( iterator . hasNext ( ) ) {                  ICodec icodec = iterator . next ( ) ;                  logger . info ( "Your system supports codec:" + icodec . getName ( ) ) ;              }          } else {              coder . setCodec ( codec ) ;          }          coder . setNumPicturesInGroupOfPictures ( 5 ) ;          coder . setBitRate ( 256000 ) ;          coder . setPixelType ( IPixelFormat . Type . YUV420P ) ;          if ( width == 0 || height == 0 ) {              logger . error ( "cannot get the real size of the stream needed to read" ) ;          }          coder . setHeight ( height ) ;          coder . setWidth ( width ) ;          coder . setFlag ( IStreamCoder . Flags . FLAG_QSCALE , true ) ;          coder . setGlobalQuality ( 0 ) ;          IRational rationalFrameRate = IRational . make ( frameRate ) ;          coder . setFrameRate ( rationalFrameRate ) ;          coder . setTimeBase ( IRational . make ( rationalFrameRate . getDenominator ( ) ,                  rationalFrameRate . getNumerator ( ) ) ) ;          coder . open ( ) ;          logger . info ( "[ENCODER] address: " + url + appName +                  "\n video size is " + width + "x" + height                  + " and framerate is " + frameRate ) ;          if ( container . writeHeader ( ) < 0 )            throw new RuntimeException ( "cannot write header" ) ;      }        public void setFinish ( ) {          this . isfinish = true ;      }        public void write ( long frameNr , IVideoPicture picture ) {          IPacket packet = IPacket . make ( ) ;          if ( frameNr == 0 ) {              // make first frame keyframe              picture . setKeyFrame ( true ) ;          }          picture . setQuality ( 0 ) ;          coder . encodeVideo ( packet , picture , 0 ) ;          picture . delete ( ) ;            if ( packet . isComplete ( ) ) {              if ( container . writePacket ( packet ) < 0 ) {                  throw new RuntimeException ( "cannot write packet" ) ;              } else {                  logger . info ( "[ENCODER] writing packet of size " + packet . getSize ( ) ) ;              }             }          if ( isfinish ) {              if ( container . writeTrailer ( ) < 0 )                  throw new RuntimeException ( "cannot write Trailer" ) ;              coder . close ( ) ;              container . close ( ) ;          }      } }

到这里已经实现了rtsp流推送到rtsp的服务器。下一步即为rtmp流的显示。使用的是flowplayer。

FlowPlayer 是一个用Flash开发的在Web上的视频播放器，可以很容易将它集成在任何的网页上。支持HTTP以及流媒体传输。

FlowPlayer的示例程序可以点击此处下载。(FlowPlayer是商业软件，此处仅作测试，请支持正版)

下载flowplay并实现以下的html，即可。

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< ! DOCTYPE html > < html > < head > <script type = "text/javascript" src = "flowplayer-3.2.13.min.js" > </script> < title > RTSP Camera to RTMP Player < / title > < / head >     < body >         < h1 > RTSP Camera to RTMP Player < / h1 >          < ! -- this A tag is where your Flowplayer will be placed . it can be anywhere -- >      < a             href = "#"          style = "display:block;width:520px;height:330px"             id = "player" >      < / a >        < ! -- this will install flowplayer inside previous A - tag . -- >      < ! -- 修改 url为 rtmp的应用名称， netConnectionUrl为 rtmp服务器的地址 -- >      <script>      flowplayer ( "player" , "flowplayer-3.2.18.swf" , {          clip : {            url : 'app' ,            provider : 'rtmp' ,            live : true ,          } ,             plugins : {               rtmp : {                 url : 'flowplayer.rtmp-3.2.13.swf' ,                 netConnectionUrl : 'rtmp://localhost:1935/live1'            }        }      } ) ;      </script>          < p >               Sample RTMP URL ( Live ) is "rtmp://live.hkstv.hk.lxdns.com/live/hks"      < / p >   < / body > < / html >

启动rtmp服务器，实例化上面的RTSPReader类并传入相应的rtsp摄像头地址，再打开这个网页即可看到摄像头直播。可以使用VLC打开rtsp流对比观看。
rtsp示例地址: rtsp://streaming3.webcam.nl:1935/n224/n224.stream

另外推荐一个世界各地的摄像头直播网站，很有趣: 世界各地的摄像头

ffmpeg 命令直接 转rtsp为rtmp

上面是使用java库转rtsp为rtmp。
ffmpeg直接就可以通过命令将rtsp转rtmp

1 2	ffmpeg - i rtsp : //地址  -f flv  rtmp://localhost:1935/live1/app

方案三的具体实现

这套方案参考地址为：使用 WebSockets 进行 HTML5 视频直播 – SegmentFault

具体实现如下：
来自rtsp摄像头的视频被 ffmpeg 编码，然后通过 HTTP 传递给一个 Node.js 写的小脚本；脚本会将这条 MPEG 视频流通过 WebSockets 分发给所有链接的浏览器；浏览器使用 JavaScript 解码 MPEG 视频流并将解码后的画面渲染到 Canvas 元素上。

1. 安装nodejs

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sudo apt - get install nodejs sudo apt - get install npm sudo apt - get install node - legacy

1. 下载 phoboslab/jsmpeg 项目的 stream-server.js 脚本。安装 WebSocket包ws并启动服务器：

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npm install ws node stream - server . js 你的密码

这里的密码是用来确视频流不被劫持用的。如果服务器运行正常，你应该会看到这样的输出：

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Listening for MPEG Stream on http : //127.0.0.1:8082/<secret>/<width>/<height> Awaiting WebSocket connections on ws : //127.0.0.1:8084/

1. 服务器启动后，你就可以启动 ffmpeg 并将它指向到正在运行的这个域名和端口了：

1 2	ffmpeg - i rtsp : //admin:12345@10.124.142.15:554/h264/ch1/main/av_stream  -f mpeg1video  -r 25  -s 640x480  http://localhost:8082/123456/640/480/

这条命令会开始从rtsp流捕捉 640×480 的视频，并编码成 25fps 码率的 MPEG 视频。编码后的视频会通过 HTTP 被发送到所指定的服务器和端口。确保密码正确，URL 中的长和宽也需要正确指定，否则服务器无法正确判断当前的分辨率。

1. 要观看直播，需要从前文提到的 jsmpeg 项目中下载 stream-example.html 和 jsmpg.js 文件，更改 stream-example.html 中的 WebSocket URL 为你的服务器地址，并使用你喜欢的浏览器打开。

如果一切正常，你就能看到摄像头画面。

总结

以上三种方案得到的结果都会有延时，具体的分析未完待续。