Direct MP4 Encoder Directshow Filter Reference

  Direct MP4 Encoder Directshow Filter

How to use the Direct MP4 Encoder Directshow Filter

This article is intended to show you how to use the Direct MP4 Encoder Directshow Filters in a simple application with default parameters.

Start by calling CoInitialize to initialize the COM library:     

HRESULT hr = CoInitialize(NULL);

Next, call CoCreateInstance to create the Filter Graph Manager.

hr = CoCreateInstance(CLSID_FilterGraph, NULL,CLSCTX_INPROC_SERVER, IID_IGraphBuilder, (void **)&pGraph);

Add the following header file.
#include <InitGuid.h>
#include "directmp4encoderuids.h"

IBaseFilter *pVCap; // Video capture filter. Initialize pVCap and add it to the filter graph (not shown)
IBaseFilter *pACap; // Audio capture filter. Initialize pACap and add it to the filter graph (not shown)

call CoCreateInstance to create the Direct MP4 Encoder Directshow Filter

 

CComPtr mMP4EncoderFilter;
hr = CoCreateInstance(CLSID_ViscomsoftDirectMP4Encoder, NULL, CLSCTX_INPROC_SERVER,IID_IBaseFilter,(void **)&mMP4EncoderFilter);

Add Direct MP4 Encoder Directshow Filter to the graph and set the MP4 file name.

hr = pGraph->AddFilter(mMP4EncoderFilter, L"Direct MP4 Encoder Filter");
CComQIPtr<IFileSinkFilter> pSink(mMP4EncoderFilter);
if(!pSink)
{
return hr;
}
pSink->SetFileName(L"c:\\temp\\myfile.mp4", NULL);

Setup the Direct MP4 Encoder parameter.

CComQIPtr<IMP4Manager, &IID_IDirectMP4EncoderConfig> pProfile(mMP4EncoderFilter);
pProfile->SetH264Preset(L"superfast");
pProfile->SetMp4VideoBitrate(m_iMp4Videobitrate);
pProfile->SetMp4AspectRatio(m_bMp4AspectRatio);
pProfile->SetMp4AudioBitrate(m_iMp4Audiobitrate);
pProfile->SetMp4AudioSampleRate(m_iMp4AudioSamplerate);
pProfile->SetMp4AudioChannel(m_iMp4Audiochannel);
pProfile->SetMp4FrameRate(m_iMp4FrameRate);
pProfile->SetMp4Resolution(m_iMp4Width,m_iMp4Height);
pProfile->SetTitle(m_strMyMP4Title.AllocSysString());
pProfile->SetAlbum(m_strMyMP4Album.AllocSysString());
pProfile->SetAuthor(m_strMyMP4Author.AllocSysString());
pProfile->SetComment(m_strMyMP4Comment.AllocSysString());
pProfile->SetCopyright(m_strMyMP4Copyright.AllocSysString());

Connect Video Capture Filter to Direct MP4 Encoder Directshow Filter, connectFilters() can be found in VC++ sample.

hr = dsHelper.connectFilters(pGraph, pVCap, mMP4EncoderFilter);

  Connect Audio Capture Filter to  Direct MP4 Encoder Directshow Filter, connectFilters() can be found in VC++ sample.
 

hr = dsHelper.connectFilters(pGraph, pACap, mMP4EncoderFilter);

Query the IMediaControl interface to control the streaming.
 

hr = pGraph->QueryInterface(IID_IMediaControl, (void**)&pControl);

Run the graph.
 

hr = pControl->Run();

When you close your application, close the COM library.
 

CoUninitialize();