如何将samplegrabber文件保存到avi？

Question

 sampGrabber = new SampleGrabber() as ISampleGrabber;
 capGraph = (ICaptureGraphBuilder2)new CaptureGraphBuilder2();

 hr = m_FilterGraph.AddSourceFilterForMoniker(dev.Mon, null, dev.Name, out capFilter);
 DsError.ThrowExceptionForHR(hr);

 // Hopefully this will be the video pin
 IPin iPinOutSource = DsFindPin.ByDirection(capFilter, PinDirection.Output, 0);

 IBaseFilter baseGrabFlt = sampGrabber as IBaseFilter;
 ConfigureSampleGrabber(sampGrabber);

 iPinInFilter = DsFindPin.ByDirection(baseGrabFlt, PinDirection.Input, 0);
 iPinOutFilter = DsFindPin.ByDirection(baseGrabFlt, PinDirection.Output, 0);

 // Add the frame grabber to the graph
 hr = m_FilterGraph.AddFilter( baseGrabFlt, "Ds.NET Grabber" );
 DsError.ThrowExceptionForHR( hr );

 hr = m_FilterGraph.Connect(iPinOutSource, iPinInFilter);
 DsError.ThrowExceptionForHR( hr );

 // Get the default video renderer
 ibfRenderer = (IBaseFilter) new VideoRendererDefault();

 // Add it to the graph
 hr = m_FilterGraph.AddFilter( ibfRenderer, "Ds.NET VideoRendererDefault" );
 DsError.ThrowExceptionForHR( hr );
 iPinInDest = DsFindPin.ByDirection(ibfRenderer, PinDirection.Input, 0);

 // Connect the graph.  Many other filters automatically get added here
 hr = m_FilterGraph.Connect(iPinOutFilter, iPinInDest);
 DsError.ThrowExceptionForHR( hr );

 SaveSizeInfo(sampGrabber);

 // Set the output window
 IVideoWindow videoWindow = m_FilterGraph as IVideoWindow;
 hr = videoWindow.put_Owner( hWin.Handle );
 DsError.ThrowExceptionForHR( hr );

 hr = videoWindow.put_WindowStyle( WindowStyle.Child | WindowStyle.ClipChildren | WindowStyle.ClipSiblings );
 DsError.ThrowExceptionForHR( hr );

 hr = videoWindow.put_Visible( OABool.True );
 DsError.ThrowExceptionForHR( hr );

 Rectangle rc = hWin.ClientRectangle;
 hr = videoWindow.SetWindowPosition( 0, 0, rc.Right, rc.Bottom );
 DsError.ThrowExceptionForHR( hr );

我把一些文本放到捕获的视频中，最后，我想把它保存到一个文件中。我该怎么做呢？如果我使用samplegrabber，我就不能使用capturegraph，反之亦然。有谁可以帮我？

Answer 1

如果您想使用SampleGrabber来抓取帧，然后写入avi文件，则需要一个编解码器和一个库来写入avi文件。您可能需要自己搜索库或sdk。

然而，我建议不要使用SampleGrabber，而是使用T型过滤器。到第二个输出的三通连接编码器，和avi文件的写入器。