Android Question RSVideoRecord ...how do I record HD video without audio?

I don't want audio to be recorded but I do want HD video. Audio should not be recorded because I still need to use VR at the same time, which fails currently when recording is in progress (due to the microphone being in use, at a guess). Here is how I start recording:

VideoRecording.unlockCamera
VideoRecording.initMediaRecorder()
VideoRecording.AudioSource = 0
VideoRecording.VideoSource = 1
VideoRecording.Profile = 1
VideoRecording.setOutputFile(File.DirRootExternal & "/blah.mp4")
VideoRecording.setPreviewDisplay
VideoRecording.prepare
VideoRecording.start

It will be possible (surely) but I don't think I'll be able to use this library. I may have to use reflection, any ideas?

Richard