Not too sure how you would actually remove the audio from the code, had a quick look and not obvious to me, we use the live streaming and as it is a news channel require the audio to be ON, not too sure why you would want the audio off ???.
If you are feeding a screen via VGA then of course the audio is separate via the 3.5mm jack, if it is fed via HDMI then can you not just mute via the OS built in audio controls ??? without knowing exactly what you are trying to achieve it is hard to know how to help, more info if possible.