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NS_E_VIDSOURCESIZE
NS_E_VIDSOURCESIZE: the capture source cannot deliver the width and height requested by the encoder
NS_E_VIDSOURCESIZE (0xC00D1B6B) identifies a specific Windows Media/platform boundary: the capture source cannot deliver the width and height requested by the encoder. Keep this stage visible instead of collapsing it into a generic playback, network, or configuration failure.
Evidence to preserve
Capture requested width/height, pixel format, frame rate, IAMStreamConfig capabilities, device/driver version, and the format that actually negotiated.
Controlled verification
Select a size advertised by the capture pin and start the same source. If negotiation succeeds but streaming fails later, diagnose that later HRESULT separately.
Technical references
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