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NS_E_WMPCORE_BUFFERTOOSMALL
What this HRESULT actually isolates
The symbolic result NS_E_WMPCORE_BUFFERTOOSMALL narrows 0xC00D107F to the playback core buffer too small condition: the destination supplied for a media-type copy cannot hold the complete structure and format block. Keep the playback core buffer too small boundary visible when a later dialog reduces it to a general media error.
An additional test is to record required size, supplied size and whether the format block length changed between calls; 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 required size, supplied size and whether the format block length changed between calls.
- Artifact: Player.URL, current media sourceURL and resolved final URL.
- State: play state and transition immediately before failure.
- Object identity: selected graph/source/filter or codec identity and version.
- Underlying evidence: audio/video device identity and driver generation.
- Correlation: ordered ErrorItem queue with errorCode, errorContext and media object.
Log paths, hashes, IDs, offsets, and HRESULTs. Exclude secrets and unrelated content from logs.
Reproduce without destroying evidence
- Find the first component that returned this result and label that event as this boundary.
- Freeze the input and object identity associated with the failing operation before WMP fallback or cleanup changes it.
- Reconstruct the immediately preceding successful state, then identify the call or event that crossed into failure.
- Perform the code-specific test: record required size, supplied size and whether the format block length changed between calls.
- Make the narrow correction—allocate from the reported requirement and repeat the read without reusing stale media-type pointers—and repeat the same producing operation.
What succeeds before this failure
Two platform rules frame the diagnosis. First, the URL, playlist item, selected source, graph and codec are distinct objects; a failure at one should not be diagnosed by replacing all of them at once. In this case, the Error and MediaError paths can queue several results, so the first specific HRESULT and its error context are more useful than the last dialog.
Representative case: A format query returns a larger codec-specific block than the caller’s fixed structure anticipated. The example isolates only the producing component.
Related HRESULTs, different boundaries
| Result | Different boundary |
|---|---|
NS_E_WMPCORE_UNAVAILABLE | The requested operation is not allowed in the Player core’s current state |
NS_E_WMPCORE_NOSOURCEURLSTRING | The current Media object has no source URL string from which playback can be resolved |
NS_E_WMPCORE_NOBROWSER | WMP cannot invoke the browser required for a web-help or related URL action |
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
Resolve this result where the relevant state is produced: allocate from the reported requirement and repeat the read without reusing stale media-type pointers. After correction, reload or recreate the owning object so cached failure state is not mistaken for a successful repair.
- Avoid installing broad codec packs before identifying the requested media subtype and missing component; it can destroy the artifact or state needed to explain this result.
- Avoid clearing the error queue or skipping to another playlist item before preserving the first failing media object; that can replace the original HRESULT with a secondary failure from another layer.
Practical interpretation
Use it, 0xC00D107F and the symbolic phrase in traces. Correlate search keys with API and object.
How to know the repair is real
Repeat the action that returned it and verify that the same object crosses the former this checkpoint. Success means reaching the next expected load, parse, playlist, control or playback state—not merely suppressing a dialog.
Technical references
- Windows Media Player SDK — normative or platform material relevant to it.
- Player MediaError event — API or format context for this HRESULT.
- ErrorItem object — documentation used to identify the producing boundary of it.
- Supported protocols and file types
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