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NS_E_WMPCORE_MEDIA_CHILD_PLAYLIST_UNAVAILABLE
What this HRESULT actually isolates
NS_E_WMPCORE_MEDIA_CHILD_PLAYLIST_UNAVAILABLE is HRESULT 0xC00D10B8. At the playback core media child playlist unavailable checkpoint it means the playlist manager cannot satisfy the playback core media child playlist unavailable structural or runtime condition; the result belongs to the Windows Media playlist and metafile state machine, not to an unspecified Player failure.
An additional test is to record playlist bytes, element stack, resolved URLs and current item/alternate state; that evidence is more useful than reinstalling the Player or changing several unrelated settings at once.
Why the producing component matters
Representative case: The playlist is present, but one reference, boundary or item state is inconsistent.
How to prove the condition
- Preserve
0xC00D10B8, the ErrorItem context and the object instance involved in the failing operation. - Confirm the failure directly: record playlist bytes, element stack, resolved URLs and current item/alternate state.
- After you correct the specific playlist construct or state transition, recreate the owning WMP object and verify that the corrected generation completes.
Minimum useful incident record
Capture state before Player cleanup:
- What to verify: record playlist bytes, element stack, resolved URLs and current item/alternate state.
- Artifact: playlist URL, format, response content type and exact downloaded bytes.
- State: ASX version and element stack at the failure.
- Object identity: resolved base URL for REF or ENTRYREF targets.
- Underlying evidence: current item index, alternate index and nested-playlist depth.
- Correlation: repeat/event state and the media object expected at its start or end.
Targeted fix
Change the responsible precondition rather than masking the symptom: correct the specific playlist construct or state transition.
Neighboring codes to separate
| Result | Different condition |
|---|---|
NS_E_WMPCORE_MEDIA_NO_CHILD_PLAYLIST | The playlist manager cannot satisfy the playback core media no child playlist structural or runtime condition |
NS_E_WMPCORE_PLAYLIST_EMPTY_NESTED_PLAYLIST_SKIPPED_ITEMS | A nested playlist yields no playable items after invalid or unsupported children are skipped |
NS_E_WMPCORE_NO_PLAYABLE_MEDIA_IN_PLAYLIST | The playlist parsed, but every item failed availability, format, rights or graph checks |
Completion criteria
Keep one fixture that reproduces 0xC00D10B8 and one corrected fixture that changes only the identified precondition.
Technical references
- Windows Media metafile reference — API or format context.
- Metafile elements reference — documentation for this result.
- ENTRYREF element — normative or platform material relevant to this result.
- REPEAT element
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