4g plane h264 streaming

Hi,
i’m building a 4g plane with a raspberry pi5 on tailscale.
the video streaming from an usb cam is transmitted via mediamtx :

cam:
      runOnInit: ffmpeg -f v4l2 -input_format h264 -video_size 640x480 -framerate 30 -use_wallclock_as_timestamps 1 -fflags +genpts -i /dev/video2 -c:v copy -f rtsp rtsp://localhost:$RTSP_PORT/$MTX_PATH

i can see the video on the computer with the ip adress from tailscale

https://100.78.14.39:8889/cam/
how can i get the streaming on qgroundcontrol ?
thanks.