Capturing without Audio
By default, the capture tool captures audio with video. To capture only video, click on the Capture menu and uncheck the Audio option. You can also turn off audio by clicking the RecordAudio link under OutputOptions so that the text reads OFF.
To enable audio capture again, open the Capture menu and check the Audio option. You can also enable audio by clicking the RecordAudio link under CaptureOptions so that the text reads ON.
You can disable audio capture in both AVI and WMV format.