What does HRESULT 0xC00D5213 (MF_E_TOPO_CANNOT_CONNECT) mean?

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The topology loader cannot build a media-type-compatible path between nodes.

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MF_E_TOPO_CODEC_NOT_FOUND	MF_E_TOPO_UNSUPPORTED

MF_E_TOPO_CANNOT_CONNECT

MF_E_TOPO_CANNOT_CONNECT means the topology loader failed to resolve one or more node connections. The nodes may exist and codecs may be registered, yet no sequence of media types and transforms produces a valid connection.

Inspect the exact branch that failed

Record input and output media types on both sides of each explicit topology connection.
Read MF_TOPONODE_ERRORCODE and the error major/subtype attributes from nodes after topology resolution fails.
Check whether a transform node is locked to a stale type or whether topology policy prevents the loader from inserting the required converter.

For playback, a minimal partial topology is often easier to resolve than a manually over-specified chain. Let the loader insert decoders and converters unless a particular transform is intentionally required.

Microsoft: creating playback topologies · Microsoft: decoder topology nodes · Microsoft: MF_TOPONODE_ERROR attributes

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