HRESULT 0xC00D6D68 (MF_E_TRANSFORM_PROPERTY_NOT

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The requested transform property is not writable in the current configuration.

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MF_E_TRANSFORM_PROPERTY_VARIANT_TYPE_WRONG	MF_E_TRANSFORM_PROPERTY_ARRAY_VALUE_WRONG_NUM_DIM

MF_E_TRANSFORM_PROPERTY_NOT_WRITEABLE

MF_E_TRANSFORM_PROPERTY_NOT_WRITEABLE is a property mutability failure. The property may exist and may be readable, but the transform does not permit the requested write.

Check mutability at the point where the write occurs

Use ICodecAPI::IsModifiable when supported and record the result immediately before SetValue.
Log whether input/output media types are already set and whether streaming has started, because codec configuration can become fixed after negotiation or activation.
Separate truly read-only reporting properties from settings that are writable only in a specific transform state.

Do not treat a successful GetValue as evidence that SetValue must also succeed. The ICodecAPI interface exposes support and modifiability as different questions. If a property must be configured before streaming, move the write earlier instead of repeatedly retrying it on an active MFT.

Microsoft: ICodecAPI methods · Microsoft: MFT negotiation and processing order · Wine: HRESULT definitions

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