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NS_S_WMPCORE_PLAYLIST_COLLAPSED_TO_SINGLE_MEDIA
M3U playlist collapsed to its single media item
NS_S_WMPCORE_PLAYLIST_COLLAPSED_TO_SINGLE_MEDIA is HRESULT 856328 (0x000D1108) from Windows Media. AllStat describes it as “The M3U playlist has been ignored because it only contains one item.” In the Windows Media Player, Windows Media Format, DRM, or Media Foundation state machine, the value reports a nonfailure state that must not be collapsed into plain S_OK.
A cleared severity bit does not make the return equivalent to ordinary completion; the postcondition remains specific.
What must be true before accepting it
Verify that the source contains only one effective playable entry and discarding the playlist wrapper does not lose metadata or navigation semantics. The boundary determines whether the caller continues, waits, falls back, or ends the operation.
Also confirm that returned outputs belong to the current operation generation and were not inherited from an earlier attempt.
Where the status is encountered
- Windows Media Player library, playlist, store, or UI plug-in callbacks; capture the exact API, object, and phase because the same numeric success severity does not define the state by itself.
- Windows Media Format source, writer, DRM, publishing-point, or installation operations;
- Media Foundation topology activation and remote-component setup;
Keep this result attached to the operation that returned it. Interpreting it outside that API contract can turn a normal continuation or partial result into an incorrect retry or false completion.
Correct handling and recovery
Open the media item directly, retain the source playlist URI for diagnostics, and avoid presenting a one-item playlist as a separate persistent object unless the application requires it.
Continuation after it within the documented state machine is different from restarting the entire operation.
Practical scenario
A downloaded M3U contains one stream URL. The player opens that stream directly while telemetry records that the container was intentionally collapsed.
Difference from nearby results
The status is not an empty-playlist result; it reports successful simplification from a wrapper to one media resource.
The distinction around it should be visible in control flow, telemetry classification, and user messaging.
References
- Microsoft: Windows Media Format SDK error and success codes
- Microsoft: Windows Media Player SDK
- Microsoft: Media Foundation SDK
- Microsoft: HRESULT values
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