MS MPEG2 Demux 1

[alarco]

Hi

I'm trying to implement the MS MPEG2 Demux but it fails. Here's my code:

-------------

if (FAILED(CoInitialize(NULL))){
...
}

IGraphBuilder *pGraph = NULL;
if (FAILED(CoCreateInstance(CLSID_FilterGraph,
NULL, CLSCTX_INPROC_SERVER,
IID_IGraphBuilder,
(void **)&pGraph)))
{
...
}

IMpeg2Demultiplexer *pDemux = NULL;
if (FAILED(pGraph->QueryInterface(IID_IMpeg2Demultiplexer,
(void**)&pDemux)))
{
// here it fails....
}
---------------

What's wrong ?!

Thanks!

 

[teriviret]

The Filter Graph Manager does not implement that interface. You need to create an instance of the MPEG-2 demux filter, and query that for the interface instead.

 

[alarco]

Oh yeah you're right. Thanks a lot!

 

[alarco]

Everything works fine, but I'm still unable to connect the MPEG2 Demux filter with the rest of the graph:

pBuild->RenderStream(NULL, NULL, pCapture,
(IBaseFilter *)pDemux, NULL);

and it fails.

Anyone has an idea why ?

 

[teriviret]

What is the HRESULT you're getting?

Do the media types match? In other words, does your source filter really generate MPEG-2 media? Are you really building a capture graph that demuxes MPEG-2?

Something else to try would be IGraphBuilder::Render() in place of ICaptureGraphBuilder2::RenderStream().

 

[alarco]

Basically, I'm developped a filter that receive MPEG2 video over the internet. It works very well when using GraphEdit:

MyRecvFilter->MS MPEG2 Demux->Elecard MPEG2 Decoder->VR

I just want to code it, so here the main lines:

---

CoInitiliaze(NULL);

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

IBaseFilter *pBaseDemux = NULL;
CoCreateInstance(CLSID_MPEG2Demultiplexer, NULL, CLSCTX_INPROC_SERVER, IID_IBaseFilter, (void **)&pBaseDemux);

IMpeg2Demultiplexer *pDemux = NULL;
pBaseDemux->QueryInterface(IID_IMpeg2Demultiplexer, (void **)&pDemux);

AM_MEDIA_TYPE mt;
ZeroMemory(&mt, sizeof(AM_MEDIA_TYPE);
mt.majortype = MEDIATYPE_Stream;
mt.subtype = MEDIASUBTYPE_MPEG2_PROGRAM
mt.formattype = FORMAT_None;
//(media types are okay)

IPin *pPinDemux = NULL;
pDemux->CreateOutputPin(&mt, L"video pin", &pPinDemux);

IMPEG2PIDMap *pPidMapDemux = NULL;
pPinDemux->QueryInterface(IID_IMPEG2PIDMap, (void **)&pPidMapDemux);

and here it fails!

When running from MSVC++, HRESULT dont have time to returns value : got a "Protection Error", telling me that a debugger is detected ?!

When launching the exec file, HRESULT returns 0x80040217, which means that The specified object was not found.

What's wrong with the code ?

Thanks for you time!

---

 

[teriviret]

This is just a guess, but I don't think you need to create the output pin on the MPEG-2 demux. I'm thinking that GraphEdit doesn't do this. If your source filter outputs the right MPEG-2 media type, you should be able to just tell the graph builder to render the source filter output pin. You should not even need to create the MPEG-2 demux, it should be set up for you.

 

[markymsofth]

http://paul.glagla.free.fr/d4.htm

unfortunately this is in french, im told you can bable fish
it, its in the area your after.

and to make things worse it delphi, easy to translate though

and it does show the graphs which you can definately follow.