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MF_E_TRANSFORM_CANNOT_INITIALIZE_ACM_DRIVER
MF_E_TRANSFORM_CANNOT_INITIALIZE_ACM_DRIVER identifies a failure below the normal MFT sample-processing loop: the transform could not initialize an Audio Compression Manager driver on which its audio path depends.
Separate ACM availability from Media Foundation negotiation
- Record the transform CLSID, audio subtype, process architecture, and installed codec/driver environment.
- Check whether the failing component is a legacy codec bridge or wrapper that depends on ACM rather than a native Media Foundation codec.
- Reproduce initialization before
ProcessInput; do not attribute the HRESULT to a particular audio sample unless logs show processing had actually begun.
Microsoft classifies ACM as a legacy feature and documents separate driver and stream APIs for it. A format can be syntactically valid while the required ACM driver fails to load or initialize. Reinstalling an unrelated MFT or changing output buffers will not repair that dependency.
Microsoft: Audio Compression Manager reference · Microsoft: Media Foundation transforms · Wine: Media Foundation HRESULT definitions
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