使用Microsoft表达式编码器从screencapture获取实时流

问题描述

| 是否可以实时流式传输本地网络的一部分屏幕？ ScreenCaptureJob只能流式传输到文件，并且如果要广播该文件，则该文件将被阻止，因为它已被另一个进程使用。

            jobScreenCap = new ScreenCaptureJob();
        // Creates a new job for encoding
        job = new LiveJob();
        var capRect = new System.Drawing.Rectangle(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();

编辑： 新问题不是实时运行。我有10秒的延迟，我需要实时或至少1秒。它不会通过互联网 服务器代码：

 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();

播放器代码：

<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>

    

解决方法

        是的，因为Encoder 4 SP1（今年发布）以来是可能的   屏幕截图作为实时信号源-现在，您可以在Live项目中选择屏幕作为设备进行流式传输或存档。   （资源） 以编程方式：

EncoderDevices.FindDevices(EncoderDeviceType.Video)

返回的

EncoderDevice

集合包含名为\“ Screen Capture Source \”的设备 因此，您需要这样的东西：

LiveJob 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(); // your Screen Capture settings here ...