在Windows上枚举所有可用视频编解码器的最佳方法？

#include <dshow.h>
#include<iostream>

int main()
{
    HRESULT hr = CoInitialize(NULL);
    if (FAILED(hr))
    {
        std::cerr << "Failed to initialize COM library"<< std::endl;
        return 1;
    }

    IFilterMapper2* pFilterMapper = NULL;
    hr = CoCreateInstance(CLSID_FilterMapper2, NULL, CLSCTX_INPROC_SERVER, IID_IFilterMapper2, (void**)&pFilterMapper);
    if (FAILED(hr))
    {
        std::cerr << "Failed to create Filter Mapper object"<< std::endl;
        return 1;
    }

    IEnumMoniker* pEnumMoniker = NULL;
    hr = pFilterMapper->EnumMatchingFilters(&pEnumMoniker, 0, TRUE, MERIT_DO_NOT_USE+1, TRUE, 0, NULL, NULL, NULL);
    if (FAILED(hr))
    {
        std::cerr << "Failed to enumerate filters"<< std::endl;
        return 1;
    }

    IMoniker* pMoniker = NULL;
    while (pEnumMoniker->Next(1, &pMoniker, NULL) == S_OK)
    {
        IPropertyBag* pPropertyBag = NULL;
        hr = pMoniker->BindToStorage(0, 0, IID_IPropertyBag, (void**)&pPropertyBag);
        if (SUCCEEDED(hr))
        {
            VARIANT var;
            VariantInit(&var);
            hr = pPropertyBag->Read(L"FriendlyName", &var, NULL);
            if (SUCCEEDED(hr))
            {
                std::wcout<< var.bstrVal<< std::endl;
                VariantClear(&var);
            }
            hr = pPropertyBag->Read(L"FilterData", &var, NULL);
            if (SUCCEEDED(hr))
            {
                std::wcout<< var.bstrVal<< std::endl;
                VariantClear(&var);
            }
            pPropertyBag->Release();
        }
        pMoniker->Release();
    }

    pEnumMoniker->Release();
    pFilterMapper->Release();
    CoUninitialize();

    return 0;
}