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    <p>This DMO/DSP is dual interfaced and is both a DMO with <code>IMediaObject</code> and an MFT with <code>IMFTransform</code>. The two interfaces share a lot common, and here is a code snippet to test initialization of RGB24 into YV12 conversion:</p> <pre><code>#include "stdafx.h" #include &lt;dshow.h&gt; #include &lt;dmo.h&gt; #include &lt;wmcodecdsp.h&gt; #pragma comment(lib, "strmiids.lib") #pragma comment(lib, "wmcodecdspuuid.lib") int _tmain(int argc, _TCHAR* argv[]) { ATLVERIFY(SUCCEEDED(CoInitialize(NULL))); CComPtr&lt;IMediaObject&gt; pMediaObject; ATLVERIFY(SUCCEEDED(pMediaObject.CoCreateInstance(CLSID_CColorConvertDMO))); VIDEOINFOHEADER InputVideoInfoHeader; ZeroMemory(&amp;InputVideoInfoHeader, sizeof InputVideoInfoHeader); InputVideoInfoHeader.bmiHeader.biSize = sizeof InputVideoInfoHeader.bmiHeader; InputVideoInfoHeader.bmiHeader.biWidth = 1920; InputVideoInfoHeader.bmiHeader.biHeight = 1080; InputVideoInfoHeader.bmiHeader.biPlanes = 1; InputVideoInfoHeader.bmiHeader.biBitCount = 24; InputVideoInfoHeader.bmiHeader.biCompression = BI_RGB; InputVideoInfoHeader.bmiHeader.biSizeImage = 1080 * (1920 * 3); DMO_MEDIA_TYPE InputMediaType; ZeroMemory(&amp;InputMediaType, sizeof InputMediaType); InputMediaType.majortype = MEDIATYPE_Video; InputMediaType.subtype = MEDIASUBTYPE_RGB24; InputMediaType.bFixedSizeSamples = TRUE; InputMediaType.bTemporalCompression = FALSE; InputMediaType.lSampleSize = InputVideoInfoHeader.bmiHeader.biSizeImage; InputMediaType.formattype = FORMAT_VideoInfo; InputMediaType.cbFormat = sizeof InputVideoInfoHeader; InputMediaType.pbFormat = (BYTE*) &amp;InputVideoInfoHeader; const HRESULT nSetInputTypeResult = pMediaObject-&gt;SetInputType(0, &amp;InputMediaType, 0); _tprintf(_T("nSetInputTypeResult 0x%08x\n"), nSetInputTypeResult); VIDEOINFOHEADER OutputVideoInfoHeader = InputVideoInfoHeader; OutputVideoInfoHeader.bmiHeader.biBitCount = 12; OutputVideoInfoHeader.bmiHeader.biCompression = MAKEFOURCC('Y', 'V', '1', '2'); OutputVideoInfoHeader.bmiHeader.biSizeImage = 1080 * 1920 * 12 / 8; DMO_MEDIA_TYPE OutputMediaType = InputMediaType; OutputMediaType.subtype = MEDIASUBTYPE_YV12; OutputMediaType.lSampleSize = OutputVideoInfoHeader.bmiHeader.biSizeImage; OutputMediaType.cbFormat = sizeof OutputVideoInfoHeader; OutputMediaType.pbFormat = (BYTE*) &amp;OutputVideoInfoHeader; const HRESULT nSetOutputTypeResult = pMediaObject-&gt;SetOutputType(0, &amp;OutputMediaType, 0); _tprintf(_T("nSetOutputTypeResult 0x%08x\n"), nSetOutputTypeResult); // TODO: ProcessInput, ProcessOutput pMediaObject.Release(); CoUninitialize(); return 0; } </code></pre> <p>This should work fine and print two <code>S_OK</code>s out...</p>
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    1. POIMFTransform interface of Color Converter DSP giving E_INVALIDARG on SetInputType/SetOutputType
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    1. USRoman R.
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    1. POIMFTransform interface of Color Converter DSP giving E_INVALIDARG on SetInputType/SetOutputType
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    1. COSince this worked, I created the corresponding `IMFMediaType` by using `MFInitMediaTypeFromAMMediaType` and compared to what i was passing in and what was returned by `GetInputAvailableType` - seems that for the available types Media Foundation sets only the video type but misses several parameters like interlacing, stride, etc. Hope this helps someone else too.
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      1. USRudolfs Bundulis
 

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