I have two PVC2300 cameras. So after a time in working conditions built-in microphones (of both cameras) begin to produce a noise, quite loud and disturbing. However, it happens both while operating on network adapter and PoE adapter. Cameras’ firmware has been updated to 18.104.22.168. But still there is aforesaid noise while filming with СISCO software as well as third-party one.
I get vide and audio from camera's over rtsp (rtsp://localip/img/media.sav)