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NS_E_WMPCORE_UNAVAILABLE
Where the Player stopped
NS_E_WMPCORE_UNAVAILABLE is HRESULT 0xC00D1080. At the playback core unavailable checkpoint it means the requested operation is not allowed in the Player core’s current state; the result belongs to the WMP playback core, graph and media-resource boundary, not to an unspecified Player failure.
An additional test is to record openState, playState and pending asynchronous operation; that evidence is more useful than reinstalling the Player or changing several unrelated settings at once.
Why the producing component matters
Before changing state, remember that the URL, playlist item, selected source, graph and codec are distinct objects; a failure at one should not be diagnosed by replacing all of them at once. A second platform rule is that the Error and MediaError paths can queue several results, so the first specific HRESULT and its error context are more useful than the last dialog.
Representative case: A seek or playlist change is requested while the core is closing the previous source.
How to prove the condition
- Use this deciding observation for this condition: record openState, playState and pending asynchronous operation.
- Apply the smallest supported remedy for this condition: wait for the required state or perform the call before teardown/transition.
Minimum useful incident record
Capture state before Player cleanup:
- What to verify: record openState, playState and pending asynchronous operation.
- Artifact: play state and transition immediately before failure.
- State: selected graph/source/filter or codec identity and version.
- Object identity: audio/video device identity and driver generation.
- Underlying evidence: ordered ErrorItem queue with errorCode, errorContext and media object.
- Correlation: Player.URL, current media sourceURL and resolved final URL.
Targeted fix
The targeted correction for this condition is to wait for the required state or perform the call before teardown/transition. Keep the original failing input until the same operation succeeds after one controlled change.
- Avoid installing broad codec packs before identifying the requested media subtype and missing component; it can destroy the artifact or state needed to explain this result.
- Avoid clearing the error queue or skipping to another playlist item before preserving the first failing media object; that can replace the original HRESULT with a secondary failure from another layer.
Neighboring codes to separate
| Result | Different condition |
|---|---|
NS_E_WMPCORE_BUFFERTOOSMALL | The destination supplied for a media-type copy cannot hold the complete structure and format block |
NS_E_WMPCORE_NOSOURCEURLSTRING | The current Media object has no source URL string from which playback can be resolved |
NS_E_WMPCORE_NOBROWSER | WMP cannot invoke the browser required for a web-help or related URL action |
Completion criteria
Technical references
- Windows Media Player SDK — documentation for this HRESULT.
- Player MediaError event — normative or platform material relevant to this HRESULT.
- ErrorItem object — API or format context.
- Supported protocols and file types
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