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NS_E_WMPCORE_CURRENT_MEDIA_NOT_ACTIVE
Where the Player stopped
0xC00D10A9 maps to NS_E_WMPCORE_CURRENT_MEDIA_NOT_ACTIVE. Its actionable interpretation is the requested action targets a Media object that is not the currently active item 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.
An additional test is to record currentMedia, currentPlaylist index and the object passed by the caller; that evidence is more useful than reinstalling the Player or changing several unrelated settings at once.
How this layer works
The playback core current media not active workflow must be separated from a generic WMP failure: windows Media metafiles are XML documents, but a well-formed document can still violate required ASX element and attribute rules. It also matters 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 for playback core current media not active: A UI command races with automatic advancement to the next item. The example isolates only the producing component.
Evidence to capture before retry
Preserve the first occurrence before retry or fallback changes the evidence. Capture one consistent object generation:
| Field | What to record |
|---|---|
| Decisive check | Record currentMedia, currentPlaylist index and the object passed by the caller |
| Artifact identity | ASX version and element stack at the failure for this reproduction |
| Runtime state | Resolved base URL for REF or ENTRYREF targets for this reproduction |
| Owning object | Current item index, alternate index and nested-playlist depth for this reproduction |
| Lower-level result | Repeat/event boundary and the media object expected at its start or end for this reproduction |
| Correlation | Playlist URL, format, response content type and exact downloaded bytes for this reproduction |
Log paths, hashes, IDs, offsets, and HRESULTs. Exclude secrets and unrelated content from logs.
Why the symbolic name matters
| Result | Different boundary |
|---|---|
NS_E_WMPCORE_PLAYLIST_STACK_EMPTY | The nested-playlist return path has no parent frame on the playlist stack |
NS_E_WMPCORE_PLAYLIST_EVENT_EMPTY | The EVENT block contains no playable entries or references |
NS_E_WMPCORE_PLAYLIST_EVENT_ATTRIBUTE_ABSENT | A required attribute is absent from a playlist EVENT block |
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.
A focused diagnostic sequence
- Preserve
0xC00D10A9, 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 currentMedia, currentPlaylist index and the object passed by the caller.
- After you wait until the item becomes current or act on the actual current media, recreate the owning WMP object and verify that the corrected generation completes.
Correct the producing condition
Change the responsible precondition rather than masking the symptom: wait until the item becomes current or act on the actual current media. 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.
Regression check
Keep one fixture that reproduces 0xC00D10A9 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.
What to search for in traces
Use this result, 0xC00D10A9 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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