Static at beaning of a screen recording

I recorded a screen recording as a video with no audio. At the beginning of the video there is a extremely loud static that then disappears about 20 seconds into the video.  I recorded about five demos all in the same session and none others have this issue. Is there a way to edit this in SL? A simple mute would be sufficient as there is no audio to the demonstration video itself. I have seen a few older posts with some similar issues, but they are not resolved. 

1 Reply