What does HRESULT 0xC00D36EB (MF_E_PROPERTY_VECTOR_NOT_ALLOWED) mean?

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the property received a VT_VECTOR value although this property requires a single value.

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MF_E_PROPERTY_NOT_EMPTY	MF_E_PROPERTY_VECTOR_REQUIRED

MF_E_PROPERTY_VECTOR_NOT_ALLOWED

MF_E_PROPERTY_VECTOR_NOT_ALLOWED is a cardinality mismatch. The supplied PROPVARIANT represents multiple values with VT_VECTOR, but the target property expects a scalar value.

Check the type flags, not just the element type

Log the complete VARTYPE. VT_LPWSTR and VT_VECTOR | VT_LPWSTR are different property shapes.
Determine whether the caller accidentally used a vector helper for a single-valued property.
Do not silently choose the first vector element unless the property's semantics explicitly define such a reduction.

In the Windows Property System, the PDTF_MULTIPLEVALUES property-description flag controls whether multiple values are stored as a VT_VECTOR. Media Foundation metadata also uses vectors for multivalued properties. The fix is to construct the expected scalar PROPVARIANT or target a property that is actually defined as multivalued.

Microsoft: PROPDESC_TYPE_FLAGS · Microsoft: IMFMetadata::SetProperty · Wine: Media Foundation property HRESULTs

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