转换AVI文件到WMV在C++ DirectShow；GraphEdit和源代码
转换AVI文件到WMV在C++ DirectShow；GraphEdit和源代码
提问于 2018-04-05 00:01:28
我想做一个工具来获得一个AVI文件作为输入，并将其转换为WMV文件，并保存在我的硬盘上。在GraphEdit中，我成功地做到了这一点，正如您在
我开始为同一任务编写COM C++代码，以达到相同的效果，但我不知道问题出在哪里，使我无法获得最终转换的文件。这是我写的代码(有很多内存泄漏)。我检查了所有返回值，一切正常，所以调用中没有错误。
#include <dshow.h>
#pragma comment(lib,"Strmiids.lib")
#define AVI_FILE_PATH L"C:\\...\\Desktop\\oo.avi"
#define WMV_FILE_PATH L"C:\\...\\Desktop\\BRGMovie.wmv"
int main() {
IGraphBuilder* pGraph = NULL;
IBaseFilter* pSource = NULL;
IBaseFilter* pAviSplitter = NULL;
IBaseFilter* pMjpegDecompressor = NULL;
IBaseFilter* pSmartTee = NULL;
IBaseFilter* pAviMux = NULL;
IBaseFilter* pFileWriter = NULL;
ICaptureGraphBuilder2* pBuild = NULL;
IFileSourceFilter* FileSource = NULL;
CoInitialize(NULL);
CoCreateInstance(CLSID_FilterGraph, NULL, CLSCTX_INPROC_SERVER, IID_IGraphBuilder, (void**)&pGraph );
CoCreateInstance(CLSID_AsyncReader, NULL, CLSCTX_INPROC_SERVER, IID_IBaseFilter, (void**)&pSource );
CoCreateInstance(CLSID_AviSplitter, NULL, CLSCTX_INPROC_SERVER, IID_IBaseFilter, (void**)&pAviSplitter );
CoCreateInstance(CLSID_MjpegDec, NULL, CLSCTX_INPROC_SERVER, IID_IBaseFilter, (void**)&pMjpegDecompressor);
CoCreateInstance(CLSID_SmartTee, NULL, CLSCTX_INPROC_SERVER, IID_IBaseFilter, (void**)&pSmartTee );
CoCreateInstance(CLSID_AviDest, NULL, CLSCTX_INPROC_SERVER, IID_IBaseFilter, (void**)&pAviMux );
CoCreateInstance(CLSID_FileWriter, NULL, CLSCTX_INPROC_SERVER, IID_IBaseFilter, (void**)&pFileWriter );
CoCreateInstance(CLSID_FileSource, NULL, CLSCTX_INPROC_SERVER, IID_IFileSourceFilter, (void**)&FileSource);
CoCreateInstance(CLSID_CaptureGraphBuilder2, NULL, CLSCTX_INPROC_SERVER, IID_ICaptureGraphBuilder2, (void**)&pBuild);
pGraph->AddFilter(pSource, NULL);
pGraph->AddFilter(pAviSplitter, NULL);
pGraph->AddFilter(pMjpegDecompressor, NULL);
pGraph->AddFilter(pSmartTee, NULL);
pGraph->AddFilter(pAviMux, NULL);
pGraph->AddFilter(pFileWriter, NULL);
pSource->QueryInterface(IID_IFileSourceFilter, (void**)&FileSource);
FileSource->Load(AVI_FILE_PATH, NULL);
pBuild->SetOutputFileName(&MEDIASUBTYPE_Asf, WMV_FILE_PATH, &pAviMux, NULL);
pBuild->RenderStream(NULL, &MEDIATYPE_Video, pSource, 0, pAviMux);
IEnumPins* EnumPins = NULL;
IPin* OutPin = NULL;
IPin* InPin = NULL;
ULONG fetched = NULL;
PIN_INFO pinfo;
// find source output
pSource->EnumPins(&EnumPins);
EnumPins->Reset();
EnumPins->Next(1, &OutPin, &fetched);
EnumPins->Release();
// find AviSplitter input
pAviSplitter->EnumPins(&EnumPins);
EnumPins->Reset();
EnumPins->Next(1, &InPin, &fetched);
InPin->QueryPinInfo(&pinfo);
pinfo.pFilter->Release();
pGraph->Connect(OutPin, InPin);
InPin->Release();
OutPin->Release();
// find AviSplitter upper output
EnumPins->Reset();
EnumPins->Next(1, &OutPin, &fetched);
OutPin->QueryPinInfo(&pinfo);
pinfo.pFilter->Release();
EnumPins->Skip(1);
EnumPins->Release();
// find MjpegDecompressor input
pMjpegDecompressor->EnumPins(&EnumPins);
EnumPins->Reset();
EnumPins->Next(1, &InPin, &fetched);
pGraph->Connect(OutPin, InPin);
InPin->Release();
OutPin->Release();
// find MjpegDecompressor output
EnumPins->Reset();
EnumPins->Next(1, &OutPin, &fetched);
OutPin->QueryPinInfo(&pinfo);
pinfo.pFilter->Release();
EnumPins->Release();
// find SmartTee input
pSmartTee->EnumPins(&EnumPins);
EnumPins->Reset();
EnumPins->Next(1, &InPin, &fetched);
pGraph->Connect(OutPin, InPin);
InPin->Release();
OutPin->Release();
// find SmartTee output
EnumPins->Reset();
EnumPins->Next(1, &OutPin, &fetched);
OutPin->QueryPinInfo(&pinfo);
pinfo.pFilter->Release();
EnumPins->Skip(1);
// find AVIMux input
pAviMux->EnumPins(&EnumPins);
EnumPins->Reset();
EnumPins->Next(1, &InPin, &fetched);
pGraph->Connect(OutPin, InPin);
InPin->Release();
OutPin->Release();
EnumPins->Skip(1);
// find AVIMux output
EnumPins->Reset();
EnumPins->Next(1, &OutPin, &fetched);
OutPin->QueryPinInfo(&pinfo);
pinfo.pFilter->Release();
// find FileWriter input
pFileWriter->EnumPins(&EnumPins);
EnumPins->Reset();
EnumPins->Next(1, &InPin, &fetched);
EnumPins->Release();
pGraph->Connect(OutPin, InPin);
InPin->Release();
OutPin->Release();
FileSource->Release();
CoUninitialize();
return 0;
}编辑：
int main() {
IGraphBuilder* pGraph = NULL;
IBaseFilter* pASFWriter = NULL;
IMediaControl *pControl = NULL;
IMediaEvent *pEvent = NULL;
ICaptureGraphBuilder2* pBuild = NULL;
HRESULT hr = CoInitialize(NULL);
hr = CoCreateInstance(CLSID_FilterGraph, NULL, CLSCTX_INPROC_SERVER, IID_IGraphBuilder, (void **)&pGraph);
hr = CoCreateInstance(CLSID_WMAsfWriter, NULL, CLSCTX_INPROC_SERVER, IID_IBaseFilter, (void **)&pASFWriter);
hr = CoCreateInstance(CLSID_CaptureGraphBuilder2, NULL, CLSCTX_INPROC_SERVER, IID_ICaptureGraphBuilder2, (void**)&pBuild);
hr = pGraph->QueryInterface(IID_IMediaControl, (void **)&pControl);
hr = pGraph->QueryInterface(IID_IMediaEvent, (void **)&pEvent);
hr = pBuild->SetOutputFileName(&MEDIASUBTYPE_Asf, WMV_FILE_PATH, &pASFWriter, NULL);
hr = pGraph->RenderFile(AVI_FILE_PATH, NULL);
hr = pControl->Run();
long evCode;
pEvent->WaitForCompletion(INFINITE, &evCode);}
回答 1
Stack Overflow用户
发布于 2018-04-05 01:37:43
提供的筛选器图形不会生成WMV (也称为ASF)文件。相反，您正在尝试创建一个扩展名为.WMV的AVI文件(您正在使用AVI Mux!)。
第二个问题是智能Tee滤波器的使用，它不应该在这样的转码图中使用。Smart Tee有自己的(并有记录的)名称。
要生成WMV文件，需要将MJPEG解码器输出连接到WM ASF Writer Filter实例的输入。需要配置过滤器并附加配置文件。
有关详细信息，请参阅Creating ASF Files in DirectShow。
在你的问题上from MSDN也是对的：
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/49655580
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