The sample ID of the sample extention for encryption.
UINT64
GUID MFSampleExtension_Encryption_SampleID = {0x6698b84e,0x0afa,0x4330,{0xae,0xb2,0x1c,0x0a,0x98,0xd7,0xa4,0x4d} }
To get this attribute, call IMFAttributes::GetUINT64.
To set this attribute, call IMFAttributes::SetUINT64.
Header: Declared in mfapi.h.