The audio / video quality of the communication between App and EASYKIT Wifi With Netatmo is defined by the indicator, during video communication, at the top right of the screen
Normally the audio / video quality indicator is white; in case it is yellow or red it is necessary to check the quality of your ADSL connection and the 3G / 4G signal on your smartphone.
Also check streaming devices on your network as they could affect network performance.