What does HRESULT 0xC00D6D77 (MF_E_TRANSFORM_ASYNC_LOCKED) mean?

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The asynchronous MFT is still locked because MF_TRANSFORM_ASYNC_UNLOCK is not enabled.

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MF_E_UNSUPPORTED_D3D_TYPE	MF_E_TRANSFORM_CANNOT_INITIALIZE_ACM_DRIVER

MF_E_TRANSFORM_ASYNC_LOCKED

MF_E_TRANSFORM_ASYNC_LOCKED is the compatibility lock defined for asynchronous Media Foundation transforms. An async MFT advertises MF_TRANSFORM_ASYNC = TRUE; the client must opt into the asynchronous processing model by setting MF_TRANSFORM_ASYNC_UNLOCK to TRUE.

Check the transform attributes before normal IMFTransform calls

Call GetAttributes and query MF_TRANSFORM_ASYNC.
If it is nonzero, set MF_TRANSFORM_ASYNC_UNLOCK before entering the async event-driven processing loop.
Use METransformNeedInput and METransformHaveOutput rather than the synchronous polling assumptions used by basic MFTs.

Until unlocked, most IMFTransform methods should return this HRESULT; Microsoft documents only a small set of discovery and encoder-type methods as exceptions. The Media Foundation pipeline performs the unlock automatically, but a custom MFT host must do it itself.

Microsoft: asynchronous MFTs and unlocking · Microsoft: MF_TRANSFORM_ASYNC · Wine: mferror.h

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