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NS_E_WMPCORE_PLAYLIST_NO_EVENT_NAME
The exact condition behind the dialog
The symbolic result NS_E_WMPCORE_PLAYLIST_NO_EVENT_NAME narrows 0xC00D10A5 to the playback core playlist no event name condition: an EVENT block lacks the event name needed to match a script command. Keep the playback core playlist no event name boundary visible when a later dialog reduces it to a general media error.
An additional test is to record the EVENT element and script-command label expected by the stream; that evidence is more useful than reinstalling the Player or changing several unrelated settings at once.
State worth preserving
Capture state before Player cleanup:
- Decisive check: record the EVENT element and script-command label expected by the stream.
- 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.
Reproduce without destroying evidence
- Preserve
0xC00D10A5, the ErrorItem context and the object generation involved in the failing operation. - 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 the EVENT element and script-command label expected by the stream.
- After you supply a nonempty matching event name, recreate the owning WMP object and verify that the corrected generation completes.
What succeeds before this failure
Two rules frame this diagnosis. First, windows Media metafiles are XML documents, but a well-formed document can still violate required ASX element and attribute rules. In this case, 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: An ad-insertion EVENT block is emitted without its NAME attribute. The example isolates only the producing component.
Related HRESULTs, 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_EVENT_ATTRIBUTE_ABSENT | A required attribute is absent from a playlist EVENT block |
NS_E_WMPCORE_PLAYLIST_EVENT_EMPTY | The EVENT block contains no playable entries or references |
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.
Recovery at the right layer
Change the responsible precondition rather than masking the symptom: supply a nonempty matching event name. 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.
Practical interpretation
Use this result, 0xC00D10A5 and the symbolic phrase in traces. Correlate search keys with API and object.
How to know the repair is real
Keep one fixture that reproduces 0xC00D10A5 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.
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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