У вашего броузера проблема в совместимости с HTML5
Amcrest IP2M-841B and other Dahua based IP cameras allow a remote unauthenticated attacker to listen to the camera's audio via an HTTP request to "videotalk"
Get the proof of concept script at https://github.com/tenable/poc/tree/master/amcrest/ip2m/get_dahua_audio.py