HRESULT 0xC00D3E9C (MF_E_MEDIA_SOURCE_NO_STREAMS

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The presentation descriptor has no streams selected for the source.

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MF_E_MEDIA_SOURCE_WRONGSTATE	MF_E_CANNOT_FIND_KEYFRAME_SAMPLE

MF_E_MEDIA_SOURCE_NO_STREAMS_SELECTED

MF_E_MEDIA_SOURCE_NO_STREAMS_SELECTED points to the presentation descriptor, not to codec discovery. A presentation descriptor contains stream descriptors and a selected/deselected flag for each stream. The source produces data only for streams selected when it starts.

Select at least one usable stream

Enumerate the descriptor with GetStreamDescriptorCount and GetStreamDescriptorByIndex, recording the selection flag and major media type.
Call SelectStream for the audio, video, or other stream that the topology will consume.
Build source-stream topology nodes only for descriptors selected in the same presentation descriptor.

Microsoft's custom-source guidance requires at least one stream to be selected in the default presentation configuration. Decoder installation does not fix an all-deselected descriptor because the source is not being asked to produce any stream data.

Microsoft: presentation descriptors · Microsoft: CreatePresentationDescriptor · Microsoft: custom media source stream selection

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