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NS_E_WMPCORE_PLAYLIST_ITEM_ALTERNATE_INIT_FAILED
Diagnosing NS_E_WMPCORE_PLAYLIST_ITEM_ALTERNATE_INIT_FAILED
0xC00D10A3 maps to this result. Its actionable interpretation is the selected alternate media object cannot initialize before becoming active within the Windows Media playlist and metafile state machine; the producing mechanism is the layer that turns ASX/WAX/WVX/WMX or library playlists into Media objects, resolves REF and ENTRYREF URLs, expands nesting, handles EVENT and REPEAT blocks and advances to alternates.
Evidence that separates the result
| Field | What to record |
|---|---|
| Decisive check | Record alternate URL, graph creation, metadata and initialization HRESULT before any switch occurs |
| Artifact identity | Current item index, alternate index and nested-playlist depth for this reproduction |
| Runtime state | Repeat/event boundary and the media object expected at its start or end for this reproduction |
| Owning object | Playlist URL, format, response content type and exact downloaded bytes for this reproduction |
| Lower-level result | ASX version and element stack at the failure for this reproduction |
| Correlation | Resolved base URL for REF or ENTRYREF targets for this reproduction |
Representative case for playback core playlist item alternate init failed: The alternate URL is selected, but its graph cannot be prepared for playback. The example isolates only the producing component.
Focused test and correction
- Perform the code-specific test: record alternate URL, graph creation, metadata and initialization HRESULT before any switch occurs.
- Make the narrow correction—repair the alternate source or format so a fresh object initializes successfully—and repeat the same producing operation.
Nearby results with different boundaries
| Result | Different boundary |
|---|---|
NS_E_WMPCORE_MEDIA_ALTERNATE_REF_EMPTY | An alternate/rollover reference exists but its URL is empty |
NS_E_WMPCORE_PLAYLIST_ITEM_ALTERNATE_MORPH_FAILED | The core cannot switch the active media object into the selected alternate representation |
NS_E_WMPCORE_PLAYLIST_ITEM_ALTERNATE_NAME_NOT_FOUND | The named alternate playlist cannot be found in the available alternate set |
Verification
Repeat the original operation with a fresh owning object after the identified precondition is corrected. Treat this result as resolved only when that same operation passes this stage; preserve any later HRESULT as a separate failure.
Technical references
- Windows Media metafile reference — normative or platform material relevant to this result.
- Metafile elements reference — API or format context for this HRESULT.
- ENTRYREF element — documentation used to identify the producing boundary of this result.
- REPEAT element
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