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VFW_E_CANNOT_CONNECT
VFW_E_CANNOT_CONNECT is a DirectShow HRESULT. The graph builder tried to make the requested connection but found no usable combination of intermediate filters. The problem can be a missing decoder, incompatible media types, a disabled third-party filter or a graph restriction imposed by the application.
How to diagnose it
- Try a direct connection first and inspect the media types advertised by the two pins.
- Use GraphStudioNext or equivalent diagnostics to see which filters the system can enumerate for the source type.
- Check codec and filter registration, bitness, merit and device availability, then add a required transform explicitly if automatic graph building is insufficient.
This differs from VFW_E_NO_ACCEPTABLE_TYPES: the graph builder may need an intermediate chain even when the endpoints are not directly compatible.
Microsoft: IGraphBuilder::Render return values
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