What does HRESULT 0xC00D36F8 (MF_E_RT_WORKQUEUE_CLASS_NOT_SPECIFIED) mean?

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The Media Foundation real-time work queue has no MMCSS class configured.

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MF_E_RT_OUTOFMEMORY	MF_E_CANNOT_CREATE_SINK

MF_E_RT_WORKQUEUE_CLASS_NOT_SPECIFIED

MF_E_RT_WORKQUEUE_CLASS_NOT_SPECIFIED identifies missing scheduling policy for a real-time work queue: the queue has not been associated with an MMCSS class required by the operation.

Verify where the class is supposed to be assigned

For a Media Session topology, inspect the source node for MF_TOPONODE_WORKQUEUE_MMCSS_CLASS before registering topology work queues with MMCSS.
For shared work queues, record the wszClass value supplied to MFLockSharedWorkQueue and the returned task ID and queue ID.
Keep the class name with the queue in diagnostics. A valid queue identifier alone does not prove that the required MMCSS association exists.

Microsoft recommends the Audio MMCSS class for an audio rendering branch and Playback for a video rendering branch when using Media Session topology branches. The exact policy is application-specific, but the class must be deliberately configured on paths that require RT registration. Changing media type attributes cannot fix a missing work-queue scheduling class.

Microsoft: topology MMCSS registration steps · Microsoft: MFLockSharedWorkQueue class parameter · Microsoft: recommended Audio and Playback classes

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