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NS_E_WMPCORE_PLAYLIST_REPEAT_START_MEDIA_NONE
The exact condition behind the dialog
The symbolic result NS_E_WMPCORE_PLAYLIST_REPEAT_START_MEDIA_NONE narrows 0xC00D10AD to the playback core playlist repeat start media none condition: the runtime cannot find the Media object that should mark the beginning of a REPEAT block. Keep the playback core playlist repeat start media none boundary visible when a later dialog reduces it to a general media error.
An additional test is to record repeat start node, parsed object identity and mutations after playlist construction; that evidence is more useful than reinstalling the Player or changing several unrelated settings at once.
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: Editing removes the first repeated item while the repeat structure still points to it. The example isolates only the producing component.
State worth preserving
Capture state before Player cleanup:
- Decisive check: record repeat start node, parsed object identity and mutations after playlist construction.
- 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
- Start with the symbolic value this result; do not diagnose the failure from the final dialog alone.
- Record the bytes or object state that produced this condition before automatic recovery mutates it.
- Exclude a stale callback or superseded object generation as the source of this event.
- Use this deciding observation for this condition: record repeat start node, parsed object identity and mutations after playlist construction.
- Apply the smallest supported remedy for this condition: restore or rebuild the missing start boundary before executing the repeat block.
Related HRESULTs, different boundaries
| Result | Different boundary |
|---|---|
NS_E_WMPCORE_PLAYLIST_REPEAT_EMPTY | A REPEAT block contains no media items to repeat |
NS_E_WMPCORE_PLAYLIST_REPEAT_END_MEDIA_NONE | The runtime cannot find the Media object that should mark the end of a REPEAT block |
NS_E_WMPCORE_INVALID_PLAYLIST_URL | The playlist URL is syntactically invalid or unusable by the playlist manager |
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
The targeted correction for this condition is to restore or rebuild the missing start boundary before executing the repeat block. Keep the original failing input until the same operation succeeds after one controlled change.
- 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.
How to know the repair is real
After correction, create a fresh Player, control, parser or playlist object and rerun the smallest reproducer for this HRESULT. Verify the resulting resource, list membership, saved file, library object or play state.
Practical interpretation
Use this result, 0xC00D10AD and the symbolic phrase in traces. Correlate search keys with API and object.
Technical references
- Windows Media metafile reference — documentation used to identify the producing boundary of it.
- Metafile elements reference — normative or platform material relevant to it.
- ENTRYREF element — API or format context for this HRESULT.
- REPEAT element It.
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