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| MF_E_TOPO_INVALID_OPTIONAL_NODE | MF_E_TOPO_CODEC_NOT_FOUND |
MF_E_TOPO_CANNOT_FIND_DECRYPTOR
MF_E_TOPO_CANNOT_FIND_DECRYPTOR means topology resolution reached encrypted or protected media but could not insert a suitable decrypting transform. This occurs before ordinary decoding can proceed.
Separate protection failure from codec failure
- Inspect the source media type and protection metadata on the failing branch.
- Verify that the required content-protection system is enabled and that the pipeline is using the appropriate protected-media path when the content requires it.
- Record topology resolution error attributes and the media type around the node where connection failed.
Installing another video decoder is not the same as providing a decryptor. MF_E_TOPO_CODEC_NOT_FOUND concerns encode/decode transforms, while this code specifically identifies the decryption stage needed before protected samples can be consumed.
Microsoft: Media Foundation topologies · Microsoft: Protected Media Path · Microsoft: topology error attributes
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