Weird audio phase cancellation when capturing with iSight

Discussion in 'Digital Video' started by stringtheorist, Aug 14, 2008.

  1. stringtheorist macrumors regular

    Apr 1, 2008
    When I first got my iMac (OSX 10.5.2 with Leopard) I had no problem capturing audio/video in iMovie using my built-in iSight. Lately however I get a strange, undulating phase-cancellation sound appearing on the audio track about 10 seconds after I start recording. I can't hear this through my Mac when I'm recording, only during playback. It completely messes up my guitar movies.

    I have since downloaded iMovie '06 but I get the same problem there too. Is there a fault with my internal mic? What else could be wrong?

    Thanks in advance.
  2. Poeben macrumors 6502

    Jul 29, 2004
    You're not monitoring your audio through speakers while recording are you?
  3. stringtheorist thread starter macrumors regular

    Apr 1, 2008
    Yes but I've always done that and never had any problems before. Besides, I tried it with the speakers turned off and I still get it.

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