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NS_E_WMP_ALREADY_IN_USE
Diagnosing NS_E_WMP_ALREADY_IN_USE in the Windows Media Player playback path
NS_E_WMP_ALREADY_IN_USE (0xC00D119E) is returned when the requested Player operation conflicts with an active modal dialog, playback task or exclusive internal workflow.
Treat this as an ownership or workflow-state conflict. Record the active dialog, operation, or object that holds the Player state, then retry only after that owner has completed or released it.
Controlled playback comparison
- Capture the resource identity and current openState/playState, modal windows, burn/rip/sync tasks, automation caller and thread.
- Verify that the caller uses the current Playlist, Media, Network, graph, device or DRM object instance.
- Run the narrow experiment: stop active operations, close Player dialogs, wait for state-change completion and invoke the method once.
- Do not combine this focused test with a codec-pack change, Player reset, or broad registry cleanup.
- If the retest returns a different specific HRESULT, diagnose that new failure as the next stage.
Actions that obscure the cause
- starting a second hidden Player instance to bypass serialization.
Technical references
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