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<blockquote data-quote="granx" data-source="post: 78089" data-attributes="member: 14760">There seem to be a bug in the way &quot;WMAudio Decoder DMO&quot; decodes WMA Pro audio from WMV files. If the audio is 5.1 channels, it will allways downmix into 2 channel stereo. This is extremely annoying, the result is whenever a WMV file with 6 channel audio is played using direct show, it will be heard as 2 channel only.In doom9.org (<a href="http://forum.doom9.org/showthread.php?t=110449&amp;page=3" target="_blank">http://forum.doom9.org/showthread.php?t=110449&amp;page=3</a>) they were able to find the reason. It seems that the &quot;WMAudio Decoder DMO&quot; has a property (_HIRESOUTPUT) that forces it to use more then 2 channels. Below is the C++ fix they proposed to Avisynth. Can this be entered to MP as well?Edit: here is the MSDN article about this issue: <a href="http://msdn.microsoft.com/library/default.asp?url=/library/en-us/wmform95/htm/multichannelaudioplaybackindirectshow.asp" target="_blank">http://msdn.microsoft.com/library/default.asp?url=/library/en-us/wmform95/htm/multichannelaudioplaybackindirectshow.asp</a>IGraphBuilder *pGraph;HRESULT hres;IBaseFilter * pDmoFilter;hres = CoCreateInstance(CLSID_DMOWrapperFilter, NULL, CLSCTX_INPROC, IID_IBaseFilter, (void **)&amp;pDmoFilter);IDMOWrapperFilter *pWrap;pDmoFilter-&gt;QueryInterface(IID_IDMOWrapperFilter, (void **)&amp;pWrap);hres = pWrap-&gt;Init(CLSID_CWMADecMediaObject, CLSID_CWMADecMediaObject);pWrap-&gt;Release();IPropertyBag *pPropertyBag = NULL;hres = pDmoFilter-&gt;QueryInterface(IID_IPropertyBag, (void**)&amp;pPropertyBag);hres = SetHiResOutput(pPropertyBag);hres = pGraph-&gt;AddFilter(pDmoFilter, L&quot;WMA Filter&quot;);hres = pGraph-&gt;RenderFile(FileName, NULL); HRESULT SetHiResOutput(IPropertyBag* pBag){ HRESULT hr = S_OK;VARIANT myVar;VARIANT myVar2;VariantInit(&amp;myVar);VariantInit(&amp;myVar2);myVar.vt = VT_BOOL;myVar.boolVal = TRUE;myVar2.vt = VT_I4;myVar2.iVal = DSSPEAKER_DIRECTOUT;hr = pBag-&gt;Write(g_wszWMACHiResOutput, &amp;myVar);hr = pBag-&gt;Write(g_wszWMACSpeakerConfig, &amp;myVar2);return hr;}</blockquote>

[QUOTE="granx, post: 78089, member: 14760"] There seem to be a bug in the way "WMAudio Decoder DMO" decodes WMA Pro audio from WMV files. If the audio is 5.1 channels, it will allways downmix into 2 channel stereo. This is extremely annoying, the result is whenever a WMV file with 6 channel audio is played using direct show, it will be heard as 2 channel only. In doom9.org ([url]http://forum.doom9.org/showthread.php?t=110449&page=3[/url]) they were able to find the reason. It seems that the "WMAudio Decoder DMO" has a property (_HIRESOUTPUT) that forces it to use more then 2 channels. Below is the C++ fix they proposed to Avisynth. Can this be entered to MP as well? Edit: here is the MSDN article about this issue: [url]http://msdn.microsoft.com/library/default.asp?url=/library/en-us/wmform95/htm/multichannelaudioplaybackindirectshow.asp[/url] IGraphBuilder *pGraph; HRESULT hres; IBaseFilter * pDmoFilter; hres = CoCreateInstance(CLSID_DMOWrapperFilter, NULL, CLSCTX_INPROC, IID_IBaseFilter, (void **)&pDmoFilter); IDMOWrapperFilter *pWrap; pDmoFilter->QueryInterface(IID_IDMOWrapperFilter, (void **)&pWrap); hres = pWrap->Init(CLSID_CWMADecMediaObject, CLSID_CWMADecMediaObject); pWrap->Release(); IPropertyBag *pPropertyBag = NULL; hres = pDmoFilter->QueryInterface(IID_IPropertyBag, (void**)&pPropertyBag); hres = SetHiResOutput(pPropertyBag); hres = pGraph->AddFilter(pDmoFilter, L"WMA Filter"); hres = pGraph->RenderFile(FileName, NULL); HRESULT SetHiResOutput(IPropertyBag* pBag) { HRESULT hr = S_OK; VARIANT myVar; VARIANT myVar2; VariantInit(&myVar); VariantInit(&myVar2); myVar.vt = VT_BOOL; myVar.boolVal = TRUE; myVar2.vt = VT_I4; myVar2.iVal = DSSPEAKER_DIRECTOUT; hr = pBag->Write(g_wszWMACHiResOutput, &myVar); hr = pBag->Write(g_wszWMACSpeakerConfig, &myVar2); return hr; } [/QUOTE]

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