你可以在 C# 中使用 Elgato 的 HDMIComponent Game Capture HD 作为视频输入设备吗？

Question

我们想知道是否可以从 Elgato 的 Game Capture HD（或类似的东西——型号/品牌无关紧要）捕获视频流，并使用 C# 将其放入窗口中。除了它自己的软件外，我们还没有找到任何关于将该产品与其他任何东西一起使用的信息，我们也没有找到任何其他可以捕获这种东西的硬件。

同样，我们的目标只是让具有 Component Out 的设备出现在屏幕上的窗口中，仅此而已。没有录音，没有屏幕截图，没有覆盖，什么都没有。只是纯粹的“现场”视频。

现在已经找了几个月了，但一无所获，所以我想我会把它扔给 SO 社区。​​p>

Answer 1

查找已注册的视频捕获 DirectShow 过滤器，您可以通过其 GUID 加载它。它会在安装 Game Capture HD 1.2.1 时安装。如有问题，请联系 Elgato 支持。

Answer 2

看看this Github 项目。它似乎展示了如何在 c++ DirectShow 应用程序中使用 Elgato 的 Game Capture HD 作为捕获设备。相同的方法应该适用于 c# 项目。

Answer 3

我知道这是一个老问题，但如果其他人偶然发现它，在 C# 中使用来自 Elgato 采集卡和 DirectShow 的视频流非常容易。下面是一个创建简单图表并预览 Elgato 视频流的示例。

using DirectShowLib;

DsROTEntry rot; //Used for remotely connecting to graph

IFilterGraph2 graph;
ICaptureGraphBuilder2 captureGraph;
IBaseFilter elgatoFilter;
IBaseFilter smartTeeFilter;
IBaseFilter videoRendererFilter;
Size videoSize;

//Set the video size to use for capture and recording
videoSize = new Size(1280, 720);

//Initialize filter graph and capture graph
graph = (IFilterGraph2)new FilterGraph();
captureGraph = (ICaptureGraphBuilder2)new CaptureGraphBuilder2();
captureGraph.SetFiltergraph(graph);
rot = new DsROTEntry(graph);

//Create filter for Elgato
Guid elgatoGuid = new Guid("39F50F4C-99E1-464A-B6F9-D605B4FB5918");
Type comType = Type.GetTypeFromCLSID(elgatoGuid);
elgatoFilter = (IBaseFilter)Activator.CreateInstance(comType);
graph.AddFilter(elgatoFilter, "Elgato Video Capture Filter");

//Create smart tee filter, add to graph, connect Elgato's video out to smart tee in
smartTeeFilter = (IBaseFilter)new SmartTee();
graph.AddFilter(smartTeeFilter, "Smart Tee");
IPin outPin = GetPin(PinDirection.Output, "Video", elgatoFilter);
IPin inPin = GetPin(PinDirection.Input, smartTeeFilter);
graph.Connect(outPin, inPin);

//Create video renderer filter, add it to graph, connect smartTee Preview pin to video renderer's input pin
videoRendererFilter = (IBaseFilter)new VideoRenderer();
graph.AddFilter(videoRendererFilter, "Video Renderer");
outPin = GetPin(PinDirection.Output, "Preview", smartTeeFilter);
inPin = GetPin(PinDirection.Input, videoRendererFilter);
graph.Connect(outPin, inPin);

//Render stream from video renderer
captureGraph.RenderStream(PinCategory.Preview, MediaType.Video, videoRendererFilter, null, null);

//Set the video preview to be the videoFeed panel
IVideoWindow vw = (IVideoWindow)graph;
vw.put_Owner(videoFeed.Handle);
vw.put_MessageDrain(this.Handle);
vw.put_WindowStyle(WindowStyle.Child | WindowStyle.ClipSiblings | WindowStyle.ClipChildren);
vw.SetWindowPosition(0, 0, 1280, 720);

//Start the preview
mediaControl = graph as IMediaControl;
mediaControl.Run();

private IPin GetPin(PinDirection pinDir, IBaseFilter filter)
{
    IEnumPins epins;
    int hr = filter.EnumPins(out epins);
    if (hr < 0)
        return null;
    IntPtr fetched = Marshal.AllocCoTaskMem(4);
    IPin[] pins = new IPin[1];
    epins.Reset();
    while (epins.Next(1, pins, fetched) == 0)
    {
        PinInfo pinfo;
        pins[0].QueryPinInfo(out pinfo);
        bool found = (pinfo.dir == pinDir);
        DsUtils.FreePinInfo(pinfo);
        if (found)
            return pins[0];
    }
    return null;
}

private IPin GetPin(PinDirection pinDir, string name, IBaseFilter filter)
{
    IEnumPins epins;
    int hr = filter.EnumPins(out epins);
    if (hr < 0)
        return null;
    IntPtr fetched = Marshal.AllocCoTaskMem(4);
    IPin[] pins = new IPin[1];
    epins.Reset();
    while (epins.Next(1, pins, fetched) == 0)
    {
        PinInfo pinfo;
        pins[0].QueryPinInfo(out pinfo);
        bool found = (pinfo.dir == pinDir && pinfo.name == name);
        DsUtils.FreePinInfo(pinfo);
        if (found)
            return pins[0];
    }
    return null;
}