Checking capability AM_SEEKING_CanSeekAbsolute fail

See more:

C++

Windows

video

directshow

I check AM_SEEKING_CanSeekAbsolute capability with following code:

bool CVideoPlayer::CanMove(void)
{
	HRESULT hr = S_OK;
	
	DWORD dwCaps = AM_SEEKING_CanSeekAbsolute;

	if ( !m_cpMediaSeeking )
	{
		return false;
	}

	hr = m_cpMediaSeeking->CheckCapabilities(&dwCaps);

#define USE_LOG
#undef USE_LOG
	
#ifdef USE_LOG
	{
		HANDLE local_file_handle = CreateFileW(L"d:\\VME.log.txt",GENERIC_WRITE,0,NULL,OPEN_ALWAYS,0,0);
		wchar_t local_string_input[] = L"\r\nhr = %d\r\n";
		wchar_t local_string_output[500];
		wsprintfW(local_string_output,local_string_input, (int)hr);
		ULONG local_byte_written = 0;
		SetFilePointer(local_file_handle,0,0,FILE_END);
		WriteFile(local_file_handle,local_string_output,wcslen(local_string_output)*sizeof(wchar_t),&local_byte_written,NULL);
		CloseHandle(local_file_handle);
	}
#endif

	if (hr==S_FALSE)
	{
		if (dwCaps & AM_SEEKING_CanSeekAbsolute)
		{
			// The stream can seek to an absolute position.
//			return true;
	    }
	}

//	return SUCCEEDED(hr);
	return ( hr == S_OK );
}

For some Video files like flv, mp4 i get following result, when converting to avi or wmv.

It get in to line, where

//			return true;

is.

It is fail, because of checking only 1 capability.

Producers of flv splitters said, that it is Microsoft's muxer directshow filters bug (Avi Muxer, File Writer and WMV Asf writer).

I tryed get IMediaSeeking interface on differend Pins and filters. Same result.

Can it be Microsoft's muxer filters bug? Can you belive that?

I should get S_OK from check call to work good.

If i assume that it works, when uncommenting line with return true, than no image get from splitter.

Same situation (no image), when i use Directshow Editing Services.
For some files it work, for some it does not work.

I need to know, why is it, to solve the problem.

Splitter producers said, that they checked it in 1 hour! And said, that their splitters work.
But i do not belive, because i have the code of my program, and it is impassable to write it in 1 hour and get results.

Is it Microsoft filters bug or splitters bug?
What should i do?