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NS_E_WMPCORE_PLAYLIST_ITEM_ALTERNATE_MORPH_FAILED
The exact condition behind the dialog
NS_E_WMPCORE_PLAYLIST_ITEM_ALTERNATE_MORPH_FAILED is HRESULT 0xC00D10A2. At the playback core playlist item alternate morph failed checkpoint it means the core cannot switch the active media object into the selected alternate representation; the result belongs to the Windows Media playlist and metafile state machine, not to an unspecified Player failure.
An additional test is to record active media state, selected alternate, transition point and the first morph-specific failure; that evidence is more useful than reinstalling the Player or changing several unrelated settings at once.
How to prove the condition
- Preserve
0xC00D10A2, the ErrorItem context and the object generation involved in playback core playlist item alternate morph failed. - Compare the failing artifact with a known-good artifact that differs only in the suspected property.
- Separate acquisition, parsing, object construction, playback and persistence until the component that produced the failure is clear.
- Confirm the failure directly: record active media state, selected alternate, transition point and the first morph-specific failure.
- After you rebuild the alternate as a compatible media object or restart the item transition cleanly, recreate the owning WMP object and verify that the corrected generation completes.
Minimum useful incident record
Capture state before Player cleanup:
- Decisive check: record active media state, selected alternate, transition point and the first morph-specific failure.
- Artifact: repeat/event boundary and the media object expected at its start or end.
- State: playlist URL, format, response content type and exact downloaded bytes.
- Object identity: ASX version and element stack at the failure.
- Underlying evidence: resolved base URL for REF or ENTRYREF targets.
- Correlation: current item index, alternate index and nested-playlist depth.
Log paths, hashes, IDs, offsets, and HRESULTs. Exclude secrets and unrelated content from logs.
Why the producing component matters
Before changing state, remember that windows Media metafiles are XML documents, but a well-formed document can still violate required ASX element and attribute rules. A second platform rule is that relative references are resolved against the containing metafile URL, and nested playlists introduce a stack and a new base URL rather than a simple flat list.
Representative case: The alternate is known, but changing the live item from its primary representation fails. The example isolates only the producing component.
A narrow remediation path
Change the responsible precondition rather than masking the symptom: rebuild the alternate as a compatible media object or restart the item transition cleanly. A retry is meaningful only after that recorded condition changes.
- Avoid flattening or rewriting a playlist before preserving the failing nesting and base-URL rules; it can destroy the artifact or state needed to explain this result.
- Avoid assuming every unplayable item means the playlist parser itself failed; that can replace the original HRESULT with a secondary failure from another layer.
Neighboring codes to separate
| Result | Different boundary |
|---|---|
NS_E_WMPCORE_PLAYLIST_ITEM_ALTERNATE_INIT_FAILED | The selected alternate media object cannot initialize before becoming active |
NS_E_WMPCORE_PLAYLIST_ITEM_ALTERNATE_NAME_NOT_FOUND | The named alternate playlist cannot be found in the available alternate set |
NS_E_WMPCORE_MEDIA_ALTERNATE_REF_EMPTY | An alternate/rollover reference exists but its URL is empty |
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
Keep one fixture that reproduces 0xC00D10A2 and one corrected fixture that changes only the identified precondition. This condition correction is complete when the intended operation succeeds without being replaced by a neighboring WMP HRESULT.
A representative failure pattern
Use this result, 0xC00D10A2 and the symbolic phrase in traces. Correlate search keys with API and object.
Technical references
- Windows Media metafile reference — API or format context for this HRESULT.
- Metafile elements reference — documentation used to identify the producing boundary of this result.
- ENTRYREF element — normative or platform material relevant to this result.
- REPEAT element
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