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I tried to capture audio from device, but when I provide device property for wasapi2src I have:

Could not open resource for reading., debugging information: ../sys/wasapi2/gstwasapi2src.c(351): gst_wasapi2_src_open (): /GstPipeline:pipeline/GstWasapi2Src:audio_source_capture:
Failed to open

I have device id (field device.id) value extracted from (GstStructure) properties on enum devices:

"\\\\\?\\SWD\#MMDEVAPI\#\{0.0.1.00000000\}.\{dfac857a-c87d-4e0a-84b1-03c250a88014\}\#\{2eef81be-33fa-4800-9670-1cd474972c3f\}"

I tried also:

"{0.0.1.00000000}.{dfac857a-c87d-4e0a-84b1-03c250a88014}"

and

"{dfac857a-c87d-4e0a-84b1-03c250a88014}"

and

"\\\?\SWD#MMDEVAPI#{0.0.1.00000000}.{dfac857a-c87d-4e0a-84b1-03c250a88014}#{2eef81be-33fa-4800-9670-1cd474972c3f}"

but every time I have Could not open resource for reading. With default device (not set device property) everything is fine.

Tested on desktop UWP app, gstreamer 1.18.