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NS_S_WMPEFFECT_TRANSPARENT
Windows Media effect requested transparent rendering
NS_S_WMPEFFECT_TRANSPARENT is HRESULT 856388 (0x000D1144) from Windows Media. The documented description is “Request to the effects control to change transparency status to transparent.” 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.
Wrappers should not translate this result to an undifferentiated Boolean before state handling finishes.
Where the status is encountered
- Windows Media Format source, writer, DRM, publishing-point, or installation operations;
- Media Foundation topology activation and remote-component setup;
What must be true before accepting it
Verify that the effect host can composite the plug-in with transparency and the alpha behavior matches the current rendering path. The caller should reject a path where outputs and state do not match the recorded condition.
Correct handling and recovery
Switch the effect surface to transparent composition, invalidate affected regions, and verify blending on the active renderer. Fall back explicitly when transparency is unsupported.
Continuation after it within the documented state machine is different from restarting the entire operation.
Difference from nearby results
NS_S_WMPEFFECT_OPAQUE requests the opposite composition mode; neither is an ordinary success with no visual state change.
Practical scenario
A visualization removes its solid background. The host recreates the surface with alpha support and checks that controls remain readable over video.
References
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