工作需要���究下市面上显示实时视频方案。这里介绍下RTMP协议。

需求获取USB摄像头，手机谁摄像头。显示到web网页上。

一、 采集摄像头

这个使用opencvSharp来采集：

nuget:

 var task = Task.Run(() =>            {                var capture = new VideoCapture(0);                VideoCaptureProperties captureProperties = new VideoCaptureProperties();                capture.Fps = 30;                //苹果测试流                //var capture = new VideoCapture("http://devimages.apple.com.edgekey.net/streaming/examples/bipbop_4x3/gear2/prog_index.m3u8", VideoCaptureAPIs.FFMPEG);                if (!capture.IsOpened())                {                    ShowContent("Failed to open capture");                    return;                }                //capture.Set(captureProperties, 80);                var frame = new Mat();                var process = new Process();                while (true)                {                    capture.Read(frame);                    if (frame.Size().Width > 0 && frame.Size().Height > 0)                    {                        HersheyFonts fontFace = new HersheyFonts();                        frame.PutText(DateTime.Now.ToString("yyyy-MM-dd HH:mm:ss"), new OpenCvSharp.Point(10, 30), fontFace, 1.0, Scalar.Red);                        //var buffer = frame.ToBytes();                        //byte[] bytes = frame.ToBytes(".jpg");                        #region 压缩尺寸变小                        //Cv2.Resize(frame, frame, new OpenCvSharp.Size(frame.Width / 2, frame.Height / 2));                        byte[] bytes = CompressImEncode(frame); //CompressImEncodeNew(frame); //                        //预览压缩                        frame = Mat.FromImageData(bytes);                        #endregion                        MatToBitmapShow(frame);                        MemoryStream memory = new MemoryStream();                        memory.Write(bytes, 0, bytes.Length);                        memory.Write(_delimiter, 0, _delimiter.Length);                        SendTCP(memory.ToArray());                        //Cv2.ImShow("Video", frame);                        //Cv2.WaitKey(1);                        // 延时一段时间                        Cv2.WaitKey(1);                    }                }            });

二、 准备RTMP 流服务器 

 这里使用 nginx-rtmp-http-flv

worker_processes  1;events {    worker_connections  1024;}rtmp {    server {        listen 1935;        application live {            live on;            ##打开 GOP 缓存，减少首屏等待时间            gop_cache on ; #打开GOP缓存，减少首屏等待时间            record_max_size 1K; #设置录制文件的最大值。                    }    }}#推流地址：rtmp://192.168.1.194:1935/live/video1#FLV 播放地址：http://127.0.0.1:8088/flv?port=1935&app=live&stream=video1http {    include       mime.types;    default_type  application/octet-stream;    sendfile        on;    keepalive_timeout  65;    server {        listen       8088;        server_name  localhost;        location / {            add_header 'Access-Control-Allow-Origin' '*';            root html;            index  index.html index.htm;        }        location /live {            flv_live on;        }        location /flv {            add_header 'Access-Control-Allow-Origin' '*';            flv_live on;            chunked_transfer_encoding on;        }                error_page   500 502 503 504  /50x.html;        location = /50x.html {            root   html;        }    }}

写推流到流媒体服务器：

string rtmp1 = "rtmp://127.0.0.1:1935/live/video1";            string rtmp2 = "rtmp://127.0.0.1/live/test110";            task = Task.Run(() =>            {                // 初始化 FFmpeg 库                var capture = new VideoCapture(0);                //var capture = new VideoCapture("http://devimages.apple.com.edgekey.net/streaming/examples/bipbop_4x3/gear2/prog_index.m3u8", VideoCaptureAPIs.FFMPEG);                if (!capture.IsOpened())                {                    ShowContent("Failed to open capture");                    return;                }                var frame = new Mat();                var process = new Process();                process.StartInfo.FileName = "ffmpeg";                //aac 音频 -r 25 帧率25 -acodec aac                process.StartInfo.Arguments = "-re -i - -vcodec libx264  -f flv " + rtmp1;                process.StartInfo.UseShellExecute = false;                process.StartInfo.RedirectStandardInput = true;                //下面这设置使其后台运行                process.StartInfo.CreateNoWindow = true;                process.Start();                while (true)                {                    capture.Read(frame);                    if (frame.Size().Width > 0 && frame.Size().Height > 0)                    {                        HersheyFonts fontFace = new HersheyFonts();                        frame.PutText(DateTime.Now.ToString("yyyy-MM-dd HH:mm:ss"), new OpenCvSharp.Point(10, 30), fontFace, 1.0, Scalar.Red);                        var buffer = frame.ToBytes();                        process.StandardInput.BaseStream.Write(buffer, 0, buffer.Length);                        MatToBitmapShow(frame);                        //Cv2.ImShow("Video", frame);                        //Cv2.WaitKey(1);                    }                }                process.WaitForExit();            });

三、网页播放：

效果：

        flv.js demo            .mainContainer {            display: block;            width: 1024px;            margin-left: auto;            margin-right: auto;        }        .urlInput {            display: block;            width: 100%;            margin-left: auto;            margin-right: auto;            margin-top: 8px;            margin-bottom: 8px;        }        .centeredVideo {            display: block;            width: 100%;            height: 576px;            margin-left: auto;            margin-right: auto;            margin-bottom: auto;        }        .controls {            display: block;            width: 100%;            text-align: left;            margin-left: auto;            margin-right: auto;        }                                                        
FLV 
            Your browser is too old which doesn't support HTML5 video.        
                    开始        暂停        停止                跳转                    var player = document.getElementById('videoElement');                if (flvjs.isSupported()) {                        var flvPlayer = flvjs.createPlayer({                                type: 'flv',                                      "isLive": true,//= 0.5) {//如果差值大于等于0.5 手动跳帧 这里可根据自身需求来定        //         this.player.currentTime = this.player.buffered.end(0);//手动跳帧        //     }        //     }        // }, 2000); //2000毫秒执行一次                                     

未完待续。。。