I have problems with Wifi Media Connect.

Everything works as it should, except the sound source that is played on the TV is wrong.

Instead of hearing the audio from the video player, I hear the "environment" audio from my notebook microphone (e.g. me talking) on the TV with a few seconds of delay.

How can I change the sound source that Wifi Media Connect uses as input?

I tried re-installing, but it didn't solve the problem - the microphone is still selected as input.