| Previous | Next |
| NS_E_WMPCORE_CURRENT_MEDIA_NOT_ACTIVE | NS_E_WMPCORE_PLAYLIST_REPEAT_EMPTY |
NS_E_WMPCORE_USER_CANCEL
What this HRESULT means
0xC00D10AB maps to NS_E_WMPCORE_USER_CANCEL. Its actionable interpretation is the operation stopped because the user or host cancellation path was invoked within the WMP playback core, graph and media-resource boundary; the producing mechanism is the core that resolves Player.URL, selects or builds a playback graph, chooses codecs and devices, prerolls media and advances between playlist items while reporting asynchronous errors.
An additional test is to record cancellation source/time and whether partial state was committed; that evidence is more useful than reinstalling the Player or changing several unrelated settings at once.
Evidence to capture before retry
Preserve the first occurrence before retry or fallback changes the playback core user cancel evidence. Capture one consistent object instance:
| Field | What to record |
|---|---|
| What to verify | Record cancellation source/time and whether partial state was committed |
| Artifact identity | Selected graph/source/filter or codec identity and version for the playback core user cancel reproduction |
| Runtime state | Audio/video device identity and driver generation for this reproduction |
| Owning object | Ordered ErrorItem queue with errorCode, errorContext and media object for this reproduction |
| Lower-level result | Player.URL, current media sourceURL and resolved final URL for this reproduction |
| Correlation | Play state and transition immediately before failure for this reproduction |
How this layer works
this workflow must be separated from a generic WMP failure: 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. It also matters that 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: The user closes a download or open dialog before playback setup completes.
A focused diagnostic sequence
- Find the first component that returned this result and label that event as the failure point.
- 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 cancellation source/time and whether partial state was committed.
- Make the targeted change—treat cancellation as terminal for that generation and start a new operation only on explicit request—and repeat the same producing operation.
Correct the producing condition
Resolve this result where the relevant state is produced: treat cancellation as terminal for that generation and start a new operation only on explicit request. 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.
Why the symbolic name matters
| Result | Different condition |
|---|---|
NS_E_WMPCORE_MISMATCHED_RUNTIME | The media was produced for, or parsed against, a runtime contract incompatible with the active WMP core |
NS_E_WMPCORE_VIDEO_TRANSFORM_FILTER_INSERTION | The core cannot insert the video transform used for display adjustments into the current graph |
NS_E_WMPCORE_MEDIA_UNAVAILABLE | The media resource is currently unavailable at its local, removable or network location |
Regression check
Technical references
- Windows Media Player SDK — normative or platform material relevant to this HRESULT.
- Player MediaError event — API or format context.
- ErrorItem object — documentation for this HRESULT.
- Supported protocols and file types
Looking for a different code? Search another status or error code.