使用Microsoft表达式编码器从screencapture获取实时流

            jobScreenCap = new ScreenCaptureJob();
        // Creates a new job for encoding
        job = new LiveJob();
        var capRect = new System.Drawing.Rectangle(0, 0, 300, 200);
        jobScreenCap.CaptureRectangle = capRect;
        jobScreenCap.ScreenCaptureVideoProfile = new ScreenCaptureVideoProfile();
        jobScreenCap.ScreenCaptureVideoProfile.Force16Pixels = true;
        EncoderDevice device = jobScreenCap.VideoDeviceSource;
        // -> the device is null
        //var source = job.AddDeviceSource(device, null);
        jobScreenCap.OutputPath = @\"C:\\output\\ScreenCap\";
        var fileName = @\"C:\\output\\ScreenCap\\test1.ismv\";
        jobScreenCap.OutputScreenCaptureFileName = fileName;
        jobScreenCap.Start();
        LiveFileSource fileSource = job.AddFileSource(fileName);
        // Makes this file the active source. Multiple files can be added 
        // and cued to move to each other at their ends
        job.ActivateSource(fileSource);
        var format = new PullBroadcastPublishFormat();
        format.BroadcastPort = 8080;
        job.PublishFormats.Add(format);
        job.StartEncoding();

 job = new LiveJob();

        Collection<EncoderDevice> devices = EncoderDevices.FindDevices(EncoderDeviceType.Video);
        EncoderDevice device = devices[0]; // maybe its somewhere else, so check for name ...  

        LiveDeviceSource source = job.AddDeviceSource(device, null);
        source.ScreenCaptureSourceProperties = new ScreenCaptureSourceProperties
                                                   {
                                                       CaptureCursor = true,
                                                       CaptureLargeCursor = false,
                                                       FrameRate = 6,
                                                       CaptureLayeredWindow = true,
                                                       Height =600,
                                                       Width = 800,
                                                       Left = 0,
                                                       Top = 0,
                                                   };
        job.ActivateSource(source);

         // Finds and applys a smooth streaming preset
        job.ApplyPreset(LivePresets.VC1256kDSL16x9);

        // Sets up variable for fomat data

            var format = new PullBroadcastPublishFormat {BroadcastPort = 8080};

        job.PublishFormats.Add(format);
        var data = job.BufferWindowSize;
        job.StartEncoding();

<Window x:Class=\"XescPlayer.MainWindow\"
    xmlns=\"http://schemas.microsoft.com/winfx/2006/xaml/presentation\"
    xmlns:x=\"http://schemas.microsoft.com/winfx/2006/xaml\"
    Title=\"MainWindow\" Height=\"600\" Width=\"800\">
<Grid>
    <MediaElement Name=\"VideoControl\" Source=\"http://localhost:8080\" />
</Grid>