What does HRESULT 0xC00D6D74 (MF_E_TRANSFORM_CANNOT_CHANGE_MEDIATYPE_WHILE_PROCESSING) mean?

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MF_E_TRANSFORM_CANNOT_CHANGE_MEDIATYPE_WHILE_PROCESSING the transform cannot accept mediatype changes in the middle of processing.%0

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MF_E_TRANSFORM_NOT_POSSIBLE_FOR_CURRENT_SPKR_CONFIG	MF_E_UNSUPPORTED_D3D_TYPE

MF_E_TRANSFORM_CANNOT_CHANGE_MEDIATYPE_WHILE_PROCESSING

MF_E_TRANSFORM_CANNOT_CHANGE_MEDIATYPE_WHILE_PROCESSING means that the MFT requires its queued data to be drained or flushed before a type change. The desired format can be valid; the timing of the change is not.

Drain or flush deliberately

For a normal format transition, send the drain message and call ProcessOutput until the transform needs more input.
Use a flush only when discarding queued media is acceptable for the application.
Check MFT_SUPPORT_DYNAMIC_FORMAT_CHANGE; without that capability, drain before changing the input type.

Do not mix media-type changes with uncontrolled input submission, or the transform can retain samples under the old format.

Microsoft: handling stream changes · Microsoft: IMFTransform::SetOutputType

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