UINT32
GUID MFSampleExtension_SampleKeyID = {0x9ed713c8,0x9b87,0x4b26,{0x82,0x97,0xa9,0x3b,0x0c,0x5a,0x8a,0xcc} }
To get this attribute, call IMFAttributes::GetUINT32.
To set this attribute, call IMFAttributes::SetUINT32.
Header: Declared in mfapi.h.