directshow采集音视频并存储到本地磁盘

[CherryCH]

我用directshow分别才从摄像头和麦克风采集音视频存储到本地，并生成wmv格式的文件.可是视频预览没有效果，生成文件也是失败的，请大家帮忙看看。代码贴出来：

   HWND hVWindow =        m_videoWindow.GetSafeHwnd();
  
	pAudioFilter = NULL;
	pBuilder=NULL;
	pGraph = NULL;
	pMediaControl = NULL;
	m_pVW=NULL;
	//pCompress = NULL;
	pASFWriter = NULL;

	HRESULT hr;

	//枚举视频设备
	ICreateDevEnum *pDevEnum = NULL;
	CoCreateInstance(CLSID_SystemDeviceEnum, NULL, CLSCTX_INPROC, 
		IID_ICreateDevEnum, (void **)&pDevEnum);
	IEnumMoniker *pClassEnum = NULL;

	hr = pDevEnum->CreateClassEnumerator(CLSID_VideoInputDeviceCategory, &pClassEnum, 0);
	ULONG cFetched;
	if (pClassEnum->Next(1, &pMoniker, &cFetched) == S_OK)     
	{
		pMoniker->BindToObject(0, 0, IID_IBaseFilter, (void**)&pSrc);
		pMoniker->Release(); 
	}
	pClassEnum->Release();

	hr = CoCreateInstance(CLSID_CaptureGraphBuilder2,0,CLSCTX_INPROC_SERVER,IID_ICaptureGraphBuilder2,(void**)&pBuilder);
	hr = CoCreateInstance(CLSID_FilterGraph, NULL, CLSCTX_INPROC_SERVER, IID_IGraphBuilder, (void **)&pGraph);
	pGraph->QueryInterface(IID_IMediaControl,(void**)&pMediaControl);
	pBuilder->SetFiltergraph(pGraph);
	hr = pGraph->QueryInterface(IID_IVideoWindow, (LPVOID *) &m_pVW);

	//枚举音频设备
	HRESULT hrAudio;
	hrAudio = FindAudioDevice(&pAudioFilter);
	if (FAILED(hrAudio))
	{
		MessageBox("查找音频设备失败");
	}

	pGraph->AddFilter(pAudioFilter,L"Audio");
	pGraph->AddFilter(pSrc,L"Video Capture");
	hr = pBuilder->RenderStream( &PIN_CATEGORY_PREVIEW, &MEDIATYPE_Video, pGraph, NULL, NULL );

	IConfigAsfWriter *pConfig = 0;
	hr = pASFWriter->QueryInterface(IID_IConfigAsfWriter, (void**)&pConfig);
	if (SUCCEEDED(hr))
	{
		// Configure the ASF Writer filter.
		pConfig->Release();
	}

	pGraph->AddFilter(pASFWriter,L"Asf Writer");
	pBuilder->SetOutputFileName(&MEDIASUBTYPE_Asf,L"c:\\a.wmv", &pASFWriter, &pSink);

	hr = pBuilder->RenderStream(&PIN_CATEGORY_PREVIEW,
		&MEDIATYPE_Video, pSrc, NULL, NULL);

	// Now add the video capture to the output file.
	hr = pBuilder->RenderStream(&PIN_CATEGORY_CAPTURE,	
		&MEDIATYPE_Video, pSrc, NULL, pASFWriter);

	// And do the same for the audio.
	hr = pBuilder->RenderStream(&PIN_CATEGORY_CAPTURE,
		&MEDIATYPE_Audio, pAudioFilter, NULL, pASFWriter);

	pMediaControl->Run();

[CherryCH]

其中配置asf查询接口失败了，可能是什么原因？

	IConfigAsfWriter *pConfig = 0;
	hr = pASFWriter->QueryInterface(IID_IConfigAsfWriter, (void**)&pConfig);
	if (SUCCEEDED(hr))
	{
		// Configure the ASF Writer filter.
		pConfig->Release();
	}

[CherryCH]

我装了window media format SDK 9.5

[CherryCH]

我改成ＡＶＩ格式了，但是ＷＭＶ肯定是可以的，还是哪里有问题．另外我采集音频怎么没效果呢？视频预览和存储现在可以了。音频的流程和视频一样啊。

[hellscythe]

你这个采集音频和视频，没有经过压缩，保存为WMV会出问题吧

[zhimingcow]

楼主，问题解决了吗？能否共享一份源码给我，小弟这几天也正在弄这个DirectShow的音视频采集，都找不到头绪。。谢谢了！