Ok, thanks Sasha, my mistake was to get the 'Duration' attribute from the
video stream instead of taking it from the #0 stream. I do not know why one
have to read this attribute from an invalid stream index (I think stream #
are 1-based).
"sasha" wrote:
[Quoted Text] > Olivier Antoine wrote:
> > Hello,
> >
> > I have got a stupid question : I am reading wmv files using the
> > IWMSyncReader interface of the WM 9 Format SDK, and I am not able to figure
> > how to get the wmv file duration (in number of frames, seconds,
> > 100-nanoseconds or whatever, I will perform the conversion).
> >
> > I saw there is an metadata attribute named 'Duration' but not all wmv files
> > seem to have this attribute set.
> >
> > Thank you in advance,
> >
> > Olivier
> >
>
>
> Here is a sample code you can use:
>
> C_ComPtr <IWMReader> _reader;
> C_ComPtr <IWMHeaderInfo> _readerHeaderInfo;
>
> hr = _reader->QueryInterface( IID_IWMHeaderInfo, (void
> **)&_readerHeaderInfo );
>
>
> WMT_ATTR_DATATYPE enumType;
> WORD cbLength = sizeof( duration );
> WORD stream = 0;
> QWORD duration;
>
> HRESULT hr = _readerHeaderInfo->GetAttributeByName( &stream,
> g_wszWMDuration, &enumType,
> (BYTE *)&duration, &cbLength );
> if ( FAILED( hr ) ) {
> LOG_ERR( _T( "Error getting reader attribures %x" ), hr );
> return eSomeError;
> }
>
>
> Good luck,
> ..a
>
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