std::chrono::steady_clock::time_point begin = std::chrono::steady_clock::now();

// Send the sample to the Sink Writer.
if (SUCCEEDED(hr))
{
    hr = pWriter->WriteSample(streamIndex, pSample);
}

std::chrono::steady_clock::time_point end = std::chrono::steady_clock::now();
cout << std::chrono::duration_cast<std::chrono::milliseconds>(end - begin).count() << endl;

HRESULT InitializeSinkWriter(IMFSinkWriter **ppWriter, DWORD *pStreamIndex)
{
    *ppWriter = NULL;
    *pStreamIndex = NULL;

    IMFSinkWriter   *pSinkWriter = NULL;
    IMFMediaType    *pMediaTypeOut = NULL;
    IMFMediaType    *pMediaTypeIn = NULL;
    IMFAttributes*  attr = NULL;
    DWORD           streamIndex;
    HRESULT hr;

    hr = MFCreateAttributes(&attr, 2);

    if (SUCCEEDED(hr))
    {
        hr = attr->SetUINT32(MF_READWRITE_ENABLE_HARDWARE_TRANSFORMS, TRUE);
    }

    if (SUCCEEDED(hr))
    {
        hr = attr->SetUINT32(MF_SINK_WRITER_DISABLE_THROTTLING, TRUE);
    }

    if (SUCCEEDED(hr))
    {
        hr = MFCreateSinkWriterFromURL(L"output.wmv", NULL, attr, &pSinkWriter);
    }
    // ... the same as in the code sample
}