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NS_S_TRANSCRYPTOR_EOF
Windows Media transcryptor reached end of file
NS_S_TRANSCRYPTOR_EOF is HRESULT 855003 (0x000D0BDB) from Windows Media. AllStat describes it as “The transcryptor object has reached end of file.” The severity bit indicates a nonfailure result, but the value carries a specific condition that must not be collapsed into plain S_OK.
In the legacy Windows Media pipeline or Player state, this result means that the transcryptor object has reached end of file. Before reporting completion for this HRESULT, the caller must reconcile the code-specific state transition and every usable output.
Where the status is encountered
- Windows Media source, reader, writer, or renderer callbacks; log the exact method and object state instead of interpreting the constant outside that contract.
- Windows Media Player SDK automation; log the exact method and object state instead of interpreting the constant outside that contract.
- Media graph, playlist, image, rights, or buffering state; log the exact method and object state instead of interpreting the constant outside that contract.
Because it is informational, a language binding may expose it as success and hide the symbolic distinction. Keep the original HRESULT available until the code-specific branch has run.
What must be true before accepting it
Verify that all transformed output before EOF was committed and the pipeline stops without requesting nonexistent input. Without that proof, it can mask a caller error even though HRESULT failure severity is not set.
Reconcile side effects associated with it before compensation or a second invocation is attempted.
Evidence and telemetry
- preserve input and output asset identity.
- preserve sample and byte counts.
- preserve last timestamp.
- preserve expected duration.
- preserve final cryptographic or container flush.
Also record ns_s_transcryptor_eof_operation, ns_s_transcryptor_eof_state_before, ns_s_transcryptor_eof_state_after, UTC time, process and thread identifiers, component version, and a correlation ID. Telemetry for this HRESULT should omit credentials while retaining nonsecret object identities and version data.
Correct handling and recovery
Flush final transformed blocks, close output securely, and verify expected item or duration counts. Treat early EOF as a separate integrity issue when counts do not match.
Retry it only when a documented input or state has changed. An unchanged retry after it is useful only when the API explicitly advances through repeated calls.
Difference from nearby results
It must be distinguished from ordinary S_OK and from failure-severity values in the same API family; its documented state changes control the next action.
Correctly separating it from neighboring values selects the proper continuation and cleanup path.
Practical scenario
A protected-media migration reaches EOF after every expected sample. The transcryptor flushes its final block and verifies the output duration before closing.
A regression test should reproduce it, assert the relevant outputs and state, then change only the decisive condition and verify the expected neighboring result or ordinary completion.
References
- Microsoft: Windows Media Format SDK error codes — official Microsoft material used to interpret it.
- Microsoft: Windows Media Player SDK
- Microsoft: Windows Media Player buffering event
- Microsoft: HRESULT values
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