我正在使用另一个directshow图表，似乎无法绕过我所看到的问题。当我在Graphedit中将图表拼接在一起时，它会：
filesource - ＆gt; demux - ＆gt;解码器 - ＆gt; color converter dmo - ＆gt;外部渲染
这很完美，播放效果惊人！
但是在代码中（并且图形构建完美而没有错误）......它没有做我想要的...而是它播放文件然而播放是非常像素化的黑色，它看起来像跳过ontop前一帧永远不会删除前一帧。
继承我的代码：
private static void BuildGraph(IGraphBuilder pGraph, string source)
{
int hr = 0;
// Graph builder.
pBuilder = (ICaptureGraphBuilder2)new CaptureGraphBuilder2();
hr = pBuilder.SetFiltergraph(pGraph);
CheckHR(hr, "Can't SetFiltergraph.");
// Add File Source (Async.).
pFileSourceAsync = (IBaseFilter)new AsyncReader();
hr = pGraph.AddFilter(pFileSourceAsync, "File Source (Async.)");
CheckHR(hr, "Can't add File Source (Async.) to graph.");
// Set source filename.
pFileSourceAsync_src = pFileSourceAsync as IFileSourceFilter;
if (pFileSourceAsync_src == null)
{
CheckHR(unchecked((int)0x80004002), "Can't get IFileSourceFilter.");
}
hr = pFileSourceAsync_src.Load(source, null);
CheckHR(hr, "Can't load file.");
// Add MPEG4 Demultiplexor.
pMPEG4Demultiplexor = (IBaseFilter)Activator.CreateInstance(Type.GetTypeFromCLSID(CLSID_MPEG4Demultiplexor));
hr = pGraph.AddFilter(pMPEG4Demultiplexor, "MPEG4 Demultiplexor");
CheckHR(hr, "Can't add MPEG4 Demultiplexor to graph.");
// Add Microsoft DTV-DVD Video Decoder.
pMicrosoftDTVDVDVideoDecoder = (IBaseFilter)Activator.CreateInstance(Type.GetTypeFromCLSID(CLSID_MicrosoftDTVDVDVideoDecoder));
hr = pGraph.AddFilter(pMicrosoftDTVDVDVideoDecoder, "Microsoft DTV-DVD Video Decoder");
CheckHR(hr, "Can't add Microsoft DTV-DVD Video Decoder to graph.");
// Add Color Converter DMO.
dmoFilter = (IBaseFilter)new DMOWrapperFilter();
dmoWrapper = (IDMOWrapperFilter)dmoFilter;
hr = dmoWrapper.Init(CLSID_ColorConverterDMO, DMOCategory.VideoEffect);
CheckHR(hr, "Can't initialize Color Converter DMO.");
hr = pGraph.AddFilter(dmoFilter, "DMO Filter");
CheckHR(hr, "Can't add Color Converter DMO to graph.");
//IMediaParams dmoParams = dmoFilter as IMediaParams;
//MPData srcLeft = new MPData();
//MPData srcTop = new MPData();
//MPData destLeft = new MPData();
//MPData destTop = new MPData();
//MPData width = new MPData();
//MPData height = new MPData();
//srcLeft.vFloat = 0;
//srcTop.vFloat = 0;
//destLeft.vFloat = 0;
//destTop.vFloat = 0;
//width.vFloat = 1280;
//height.vFloat = 720;
//dmoParams.SetParam(0, srcLeft);
//dmoParams.SetParam(1, srcTop);
//dmoParams.SetParam(2, destLeft);
//dmoParams.SetParam(3, destTop);
//dmoParams.SetParam(4, width);
//dmoParams.SetParam(5, height);
// Add Smart Tee.
pSmartTee = (IBaseFilter)new SmartTee();
hr = pGraph.AddFilter(pSmartTee, "Smart Tee");
CheckHR(hr, "Can't add Smart Tee to graph.");
// Add Decklink Video Render.
pDecklinkVideoRender = CreateFilterByName(@"Decklink Video Render", CLSID_ExternalRenderers);
hr = pGraph.AddFilter(pDecklinkVideoRender, "Decklink Video Render");
CheckHR(hr, "Can't add Decklink Video Render to graph.");
// Add AVI Decompressor.
pAVIDecompressor = (IBaseFilter)new AVIDec();
hr = pGraph.AddFilter(pAVIDecompressor, "AVI Decompressor");
CheckHR(hr, "Can't add AVI Decompressor to graph.");
// Add Color Space Converter.
pColorSpaceConverter = (IBaseFilter)new Colour();
hr = pGraph.AddFilter(pColorSpaceConverter, "Color Space Converter");
CheckHR(hr, "Can't add Color Space Converter to graph.");
// Add Null Renderer.
pNullRenderer = (IBaseFilter)Activator.CreateInstance(Type.GetTypeFromCLSID(CLSID_NullRenderer));
hr = pGraph.AddFilter(pNullRenderer, "Null Renderer");
CheckHR(hr, "Can't add Null Renderer to graph.");
// Connect File Source (Async.) and MPEG4 Demultiplexor.
hr = pGraph.ConnectDirect(GetPin(pFileSourceAsync, "Output"), GetPin(pMPEG4Demultiplexor, "Input"), null);
CheckHR(hr, "Can't connect File Source (Async.) and MPEG4 Demultiplexor.");
// Connect MPEG4 Demultiplexor and Microsoft DTV-DVD Video Decoder.
hr = pGraph.ConnectDirect(GetPin(pMPEG4Demultiplexor, "Video 1"), GetPin(pMicrosoftDTVDVDVideoDecoder, "Video Input"), null);
CheckHR(hr, "Can't connect MPEG4 Demultiplexor and Microsoft DTV-DVD Video Decoder.");
// Connect Microsoft DTV-DVD Video Decoder and Color Converter DMO.
hr = pGraph.ConnectDirect(GetPin(pMicrosoftDTVDVDVideoDecoder, "Video Output 1"), GetPin(dmoFilter, "in0"), null);
CheckHR(hr, "Can't connect Microsoft DTV-DVD Video Decoder and Color Converter DMO.");
// Connect Color Converter DMO and Smart Tee Filter.
hr = pGraph.ConnectDirect(GetPin(dmoFilter, "out0"), GetPin(pSmartTee, "Input"), null);
CheckHR(hr, "Can't connect Color Converter DMO and Smart Tee Filter.");
// Connect Smart Tee Filter and Decklink Video Render.
hr = pGraph.ConnectDirect(GetPin(pSmartTee, "Capture"), GetPin(pDecklinkVideoRender, "In"), null);
CheckHR(hr, "Can't connect Smart Tee Filter and Decklink Video Render.");
// Add SampleGrabber.
pSampleGrabber = (IBaseFilter)Activator.CreateInstance(Type.GetTypeFromCLSID(CLSID_SampleGrabber));
hr = pGraph.AddFilter(pSampleGrabber, "SampleGrabber");
CheckHR(hr, "Can't add SampleGrabber to graph.");
(pSampleGrabber as ISampleGrabber).SetBufferSamples(true);
(pSampleGrabber as ISampleGrabber).SetOneShot(false);
// Connect Smart Tee and SampleGrabber.
hr = pGraph.ConnectDirect(GetPin(pSmartTee, "Preview"), GetPin(pSampleGrabber, "Input"), null);
CheckHR(hr, "Can't connect Smart Tee and SampleGrabber.");
// Connect SampleGrabber and AVIDecompressor.
hr = pGraph.ConnectDirect(GetPin(pSampleGrabber, "Output"), GetPin(pAVIDecompressor, "XForm In"), null);
CheckHR(hr, "Can't connect SampleGrabber and AVIDecompressor.");
// Connect AVIDecompressor and Color Space Converter.
hr = pGraph.ConnectDirect(GetPin(pAVIDecompressor, "XForm Out"), GetPin(pColorSpaceConverter, "Input"), null);
CheckHR(hr, "Can't connect Color Space Converter and SampleGrabber.");
// Connect Color Space Converter and Null Renderer.
hr = pGraph.ConnectDirect(GetPin(pColorSpaceConverter, "XForm Out"), GetPin(pNullRenderer, "In"), null);
CheckHR(hr, "Can't connect Color Space Converter and Null Renderer.");
// Set SampleGrabber Media Type.
AMMediaType pSampleGrabber_pmt = new AMMediaType();
pSampleGrabber_pmt.majorType = MediaType.Video;
pSampleGrabber_pmt.subType = MediaSubType.RGB32;
pSampleGrabber_pmt.formatType = FormatType.VideoInfo;
VideoInfoHeader pSampleGrabber_format = new VideoInfoHeader();
pSampleGrabber_pmt.formatPtr = Marshal.AllocCoTaskMem(Marshal.SizeOf(pSampleGrabber_format));
Marshal.StructureToPtr(pSampleGrabber_format, pSampleGrabber_pmt.formatPtr, false);
hr = ((ISampleGrabber)pSampleGrabber).SetMediaType(pSampleGrabber_pmt);
DsUtils.FreeAMMediaType(pSampleGrabber_pmt);
CheckHR(hr, "Can't set media type to sample grabber.");
}
你会看到我有更多的代码，比如连接一个智能T恤和一个样本抓取器（这不是原因，因为我之前已经评论过它来检查结果而没有变化，最终我我想从视频流中抓取静止图像...所以我准备好了它就好了。
我认为问题在于颜色转换器dmo但我不完全确定... graphedit中的确切图形运行没有任何问题，但代码模式给我带来可怕的回放。也许这是我忘记用颜色转换器dmo做的事情？还是包装？任何想法都将不胜感激。
谢谢， 欢呼声。
答案 0 :(得分：1)
我没有关于Color Converter DMO的详细信息，但根据其他Vista + DMO的经验 - 它们不适合在DirectShow中使用。是的，它们仍然是DMO，实现了IMediaObject接口，DMO Wrapper Filter也存在，但小问题正在破坏整合。
如果它没有开箱即用，很可能你必须将DMO放在你自己的包装过滤器中。这肯定会成功，而且 - 好消息 - 它并不复杂。
较早的DMO肯定会在DirectShow中使用库存包装过滤器进行测试，这就是为什么它们一直在工作，这就是为什么DMO Wrapper Filter首先可用的原因。