Yes, RTSP stream is supported, only one stream per BirdNET-Go instance at this time. Docker support is still very young and there is quite bit of rough edges so please don't expect perfect or even trouble free experience.

Run docker image with "realtime --rtsp url" parameter like

docker run -ti -v /path/to/config:/config -v /path/to/data:/data ghcr.io/tphakala/birdnet-go realtime --rtsp rtsp://user:[email protected]:554

This is my docker config - (I had an 8080 conflict to changed to 7979)

version: "3.3"
services:
birdnet-go:
tty: true
stdin_open: true
ports:
- 7979:8080
volumes:
- /home/me/config/birdnetgo/config:/config
- /home/me/config/birdnetgo/data:/data
image: ghcr.io/tphakala/birdnet-go:latest
command: realtime --rtsp rtsps://my.rtsps.stream
runtime: nvidia
restart: unless-stopped
networks: {}

So far working quite well with minimal CPU usage. Hoping multiple rtsps streams are supported. But so far quite a bit more responsive than the birdnet-pi I'm running.