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NS_E_WMG_SINKALREADYEXISTS
NS_E_WMG_SINKALREADYEXISTS: what the result means
NS_E_WMG_SINKALREADYEXISTS (0xC00D1055) means the graph is being asked to add another sink or renderer where the stream already has one.
What to capture
Record the stream/pin, the existing sink, the sink being inserted and the graph-building call sequence. Include any automatic renderer creation that occurred before the explicit insertion.
Focused verification
Enumerate the current graph before adding the sink and skip the duplicate insertion. If the graph then builds, correct the graph-construction logic rather than replacing the media source.
Technical references
- The DirectShow filter graph
- DirectShow media types
- Negotiating media types
- WM ASF Reader filter
- Microsoft HRESULT registry
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