UINT64
Generates a key function.
GUID MFSampleExtension_GenKeyFunc = {0x441ca1ee,0x6b1f,0x4501,{0x90,0x3a,0xde,0x87,0xdf,0x42,0xf6,0xed} }
To get this attribute, call IMFAttributes::GetUINT64.
To set this attribute, call IMFAttributes::SetUINT64.
Header: Declared in mfapi.h.