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NS_S_WMR_ALREADYRENDERED
Windows Media stream is already rendered
NS_S_WMR_ALREADYRENDERED is HRESULT 856159 (0x000D105F) from Windows Media. AllStat describes it as “The specified stream has already been rendered.” 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 specified stream has already been rendered. Handling of it is complete only after the caller verifies what work occurred and what remains outstanding.
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 the existing renderer and connection satisfy the requested stream and no duplicate graph branch is created. Failure to prove the boundary can make it look healthy while the intended operation remains unfinished.
Classify the operation phase reached at it before releasing objects or issuing replacement work.
Evidence and telemetry
- preserve stream number and media type.
- preserve existing renderer CLSID.
- preserve connected pin identities.
- preserve graph generation.
- preserve request that attempted duplicate rendering.
Also record ns_s_wmr_alreadyrendered_operation, ns_s_wmr_alreadyrendered_state_before, ns_s_wmr_alreadyrendered_state_after, UTC time, process and thread identifiers, component version, and a correlation ID. Keep it traces useful by recording object identity and timing while excluding authentication or content secrets.
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.
The semantic difference represented by it should be visible in both control flow and operational metrics.
Correct handling and recovery
Reuse the established renderer or inspect the graph before changing it. Do not add a second renderer that competes for the same stream.
Retry it only when a documented input or state has changed. Only a meaningful state transition should cause a repeated request after it.
Practical scenario
A graph-building helper is asked to render an audio stream twice. It detects the existing branch and returns the current renderer connection.
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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