H264 IMFTransform::SetOutputType returns E_FAIL

The only other question that posts this particular problem shouldn't be an issue- I avoid setting MF_MT_MPEG2_LEVEL on the output node. When I Call SetOutputType on my Transform Object (H264 TRansform Object), it returns E_FAIL as the return code. I'm not entirely sure what I am doing wrong, though I suspect that it may have something to do with what I am setting the output node to: 

// Create Transform- H264 Encoder

IUnknown* pUnk;

CLSID *pMFTCLSIDs = NULL;   // Pointer to an array of CLISDs. 

DWORD dwStreamID = 0;

IMFMediaType* pInputType = NULL;

IMFMediaType* pOutputType = NULL;

ICodecAPI* pCodec = NULL;

UINT32 cCLSID = 0;          // Size of the array.

UINT32 cBitrate = 10000;

IMFMediaTypeHandler* pVideoTypeHandler;

CHECK_HR(pSD->GetStreamIdentifier(&dwStreamID));

CHECK_HR(pSD->GetMediaTypeHandler(&pVideoTypeHandler));

CHECK_HR(pVideoTypeHandler->GetCurrentMediaType(&pInputType));

SafeRelease(&pVideoTypeHandler);

IMFTransform* pTransformer;

// Set the Transform type

MFT_REGISTER_TYPE_INFO tinfo = {MFMediaType_Video , MFVideoFormat_H264};

// Look for an encoder.

CHECK_HR( MFTEnum(

MFT_CATEGORY_VIDEO_ENCODER,

0,                  // Reserved

NULL,               // Input type to match. None.

&tinfo,             // H264 encoded type.

NULL,               // Attributes to match. (None.)

&pMFTCLSIDs,        // Receives a pointer to an array of CLSIDs.

&cCLSID             // Receives the size of the array.

));

//Create the MFT decoder

CHECK_HR(CoCreateInstance(pMFTCLSIDs[0], NULL, CLSCTX_INPROC_SERVER, IID_PPV_ARGS(&pTransformer)));

// H264 encoder requires Output first, then input.

//Set Output Type

//Get the first output type

//You can loop through the available output types to choose 

//the one that meets your target requirements

CHECK_HR( pTransformer->GetOutputAvailableType(0, 0, &pOutputType));

// Bitrate

CHECK_HR(  pOutputType->SetUINT32(MF_MT_AVG_BITRATE, cBitrate));

//,

//Interlace Mode:

CHECK_HR(CopySingleAttribute(pInputType,pOutputType,MF_MT_INTERLACE_MODE)); // just coping from the input, shouldn't be interlaced though.

CHECK_HR(pOutputType->SetGUID(MF_MT_MAJOR_TYPE,MFMediaType_Video));

CHECK_HR(pOutputType->SetGUID(MF_MT_SUBTYPE, MFVideoFormat_H264));

CHECK_HR(pOutputType->SetUINT32(MF_MT_AVG_BITRATE,14000 * 1024)); //14000k

CHECK_HR(MFSetAttributeRatio(pOutputType,MF_MT_FRAME_RATE,30, 1)); // 30 Frames/ second

CHECK_HR(MFSetAttributeRatio(pOutputType,MF_MT_FRAME_SIZE,1280,720)); // 720p input

CHECK_HR(pOutputType->SetUINT32(MF_MT_MPEG2_PROFILE, eAVEncH264VProfile_Main));

// Output Type

CHECK_HR(pTransformer->SetOutputType(dwStreamID,pOutputType,0)); // Returns E_FAIL at the moment.