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MF_E_INVALIDTYPE
What the code tells you
MF_E_INVALIDTYPE means the caller supplied a value whose COM, PROPVARIANT, media, or object type is incompatible with the requested operation.
The result comes from the interface that validates the type before consuming its value. A representative case is an IMFAttributes key expects UINT32 but receives a string, or a transform receives the wrong media subtype.
Evidence to preserve
the GUID or VARTYPE, major and subtype GUIDs, attribute key, stream number, and the type advertised by the object.
Build a useful incident record
Reproduce without erasing context
- Record and verify: the GUID or VARTYPE, major and subtype GUIDs, attribute key, stream number, and the type advertised by the object.
- Run the controlled comparison: enumerate or query the supported type first, then retry with exactly one advertised type.
Comparison with adjacent conditions
| HRESULT | Meaning in the standard description |
|---|---|
MF_E_INVALIDNAME | Invalid name. |
MF_E_UNEXPECTED | An unexpected error has occurred in the operation requested. |
MF_E_INVALIDINDEX | Invalid index. |
Here, MF_E_FORMAT_CHANGE_NOT_SUPPORTED concerns a supported type that would require an unavailable transition.
Resolution and proof
For this occurrence, convert the value to the documented type or negotiate an accepted media type before setting it.
Authoritative references
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