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> Unifi exposes an RTSP feed for each camera

Do you mean an RTSP audio only stream separate from the video+audio feed you might ingest to an NVR, or combined audio/video RTSP stream? Most manufacturers of security cameras with ordinary RTSP stream functions support provide both video and audio together. 'Frigate' for instance will auto detect audio stream on a reolink camera and it "just works" in the latest versions of Frigate.

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Unifi provides local RTSP streams in different resolutions, birdnet will happily take a rtsp and strip it's audio out for processing (ffmpeg?)

Have you had any difficulty with simultaneously retrieving >1 RTSP stream from the camera at a time, 24x7? Such as full resolution video/audio to a NVR for security purposes and then a second stream to birdnet?

Negative, you can always use go2rtc or scrypted to proxy them.

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