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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. The example isolates only the producing component.
How to prove the condition
- Start with the symbolic value this result; do not diagnose the failure from the final dialog alone.
- Record the bytes or object state that produced this condition before automatic recovery mutates it.
- Exclude a stale callback or superseded object generation as the source of this event.
- 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:
- Decisive check: 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.
Log paths, hashes, IDs, offsets, and HRESULTs. Exclude secrets and unrelated content from logs.
A narrow remediation path
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 boundary |
|---|---|
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 |
If this result is followed by a broader “cannot play,” “cannot load,” or “operation failed” result, preserve the earlier event. A later wrapper error may be secondary.
Completion criteria
After correction, create a fresh Player, control, parser or playlist object and rerun the smallest reproducer for this HRESULT. Verify the resulting resource, list membership, saved file, library object or play state.
A representative failure pattern
Use this result, 0xC00D1080 and the symbolic phrase in traces. Correlate search keys with API and object.
Technical references
- Windows Media Player SDK — documentation used to identify the producing boundary of it.
- Player MediaError event — normative or platform material relevant to it.
- ErrorItem object — API or format context for this HRESULT.
- Supported protocols and file types It.
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