What does HRESULT 0xC00D520E (MF_E_TOPO_INVALID_OPTIONAL_NODE) mean?

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An optional topology node cannot be removed or bypassed in this graph.

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MF_E_AUDIO_SERVICE_NOT_RUNNING	MF_E_TOPO_CANNOT_FIND_DECRYPTOR

MF_E_TOPO_INVALID_OPTIONAL_NODE

MF_E_TOPO_INVALID_OPTIONAL_NODE is produced while resolving a Media Foundation topology. Optional-node behavior is controlled by the topology node's connection method, but the node still has to form a valid segment when the loader removes or bypasses it.

Check node position and connection cardinality

Inspect the node's MF_TOPONODE_CONNECT_METHOD value and whether the node is actually marked optional.
Verify the number and indexes of connected inputs and outputs before sending the partial topology to the loader.
Do not place an optional transform as the first or last node of a segment when removing it would leave the branch without valid endpoints.

A codec-install problem normally surfaces as MF_E_TOPO_CODEC_NOT_FOUND. This HRESULT instead points to topology structure and optional-node semantics.

Microsoft: topology node attributes · Microsoft: creating playback topologies

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