如何使用DirectShowLib捕获elgato视频流窗口？
如何使用DirectShowLib捕获elgato视频流窗口？
提问于 2015-06-20 12:39:19
我有埃尔加托捕获设备连接到我的个人电脑，我试图捕捉和观看现场窗口的埃尔加托捕获设备。
我在谷歌搜索并找到了这样的答案：
你能用埃尔加托的HDMIComponent游戏捕捉高清作为视频设备在C#？
这是代码：
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();我在我的项目中创建了一个新表单，并添加了DirectShowLib-2005DLL，然后在新表单的顶部添加了以下内容：
using DirectShowLib;在构造函数添加全局vars之前：
IFilterGraph2 graph;
ICaptureGraphBuilder2 captureGraph;
IBaseFilter elgatoFilter;
IBaseFilter smartTeeFilter;
IBaseFilter videoRendererFilter;
Size videoSize;然后在构造函数中，我添加了其余的代码。我现在很少犯错误：
在这一行中，变量rot不存在：
rot = new DsROTEntry(graph);在使用方法GetPin的四行中，方法GetPin不存在：
IPin outPin = GetPin(PinDirection.Output, "Video", elgatoFilter);
IPin inPin = GetPin(PinDirection.Input, smartTeeFilter);
outPin = GetPin(PinDirection.Output, "Preview", smartTeeFilter);
inPin = GetPin(PinDirection.Input, videoRendererFilter);在这条线上：
vw.put_Owner(videoFeed.Handle);变量videoFeed不存在。
最后这两行：
mediaControl = graph as IMediaControl;
mediaControl.Run();mediaControl不存在。
我错过了什么？
回答 1
Stack Overflow用户
回答已采纳
发布于 2015-06-20 12:55:45
videoFeed是您的控件，用于托管您正在嵌入的视频。
mediaControl将是IMediaControl类型的变量。
IMediaControl mediaControl = graph as IMediaControl;
mediaControl.Run();GetPin是这或类似的；DsROTEntry不是强制性的，而是使用GraphEdit或类似工具的帮助外部检查过滤图。
页面原文内容由Stack Overflow提供。腾讯云小微IT领域专用引擎提供翻译支持
原文链接：
https://stackoverflow.com/questions/30954127
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