ATTN: Vegas users

Discussion in 'Amateur Video Production' started by bjeanneb, Apr 17, 2006.

  1. bjeanneb

    bjeanneb Guest

    I had a most peculiar problem trying to import video from my camcorder into
    my computer using Vegas 5 Capture. I did everything as I had done many,
    many times before with no problem. I was getting a hum through my speakers
    that quickly escalated into a LOUD hum and only stopped when I detached the
    firewire cord or shut down the capture program. For about five hours I
    tried every solution I could think might possibly work and what finally put
    an end to the annoyance was changing camcorders. Anyone have an answer to
    this enigma? Windows XP, plenty of memory and hard drive space. Hard drive
    clean. No other problems.


    Don't Sweat the Small Stuff.
    p.s. it's all small stuff.
    ---Michael R. Mantell, Ph.D.
    bjeanneb, Apr 17, 2006
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  2. bjeanneb

    Davey Boy 2 Guest

    If you disconnect the Camcoder battery, leave the camcorder for 5 minutes
    and then reconnet the battery does the problem still occur?

    Does the volume of the hum change if you move the phsyical camera?

    Davey Boy 2, Apr 17, 2006
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  3. Also, does the hum go away if you run the camcorder from battery alone,
    without its AC supply?

    Or even if you reverse the AC supply's power plug in the wall? Some,
    but not all, of these power supplies have unpolarized plugs.

    Gene E. Bloch, Apr 18, 2006
  4. bjeanneb

    bjeanneb Guest

    Hum is still there with battery alone. Did not try reversing the power plug
    but I'll do that tomorrow. Too late tonight to get frustrated. Thanks for
    answering. My husband said he thought it was some sort of feedback.

    bjeanneb, Apr 18, 2006
  5. bjeanneb

    bjeanneb Guest

    Thanks for answering. I did try using just the battery, but most of the
    time, I was only using the power supply with no battery connected. I moved
    everything around including the woofer and the CPU. No difference until I
    changed camcorders!

    bjeanneb, Apr 18, 2006
  6. bjeanneb

    Davey Boy 2 Guest

    Thanks for answering. I did try using just the battery, but most of the
    In the old (pre-digital) days this may have been caused by an Earth loop but
    I guess we can elminate that option.

    Out of curiosity are you able to do an analogue capture from the "suspect"

    Davey Boy 2, Apr 18, 2006
  7. If the hum remains on battery *with the AC power unplugged*, then the
    power plug reversal won't help. Sorry.

    Often this problem is caused by a ground loop, meaning devices plugged
    into your setup have different and inconsistent signal ground setups.

    A possible experiment is to unplug every device from your computer that
    you are not using when capturing, especially anything related to audio.

    Unfortunately, there is another cause: the failure of an internal power
    supply in some device or other, so that some AC gets into what should
    be a DC voltage. IMHO, this jibes with your report of the hum getting

    And yet another thought: have you played the tape on the camera by
    itself, listening to the camcorder's internal speaker (or headphones if
    possible)? It may be that the hum is on the original tape.

    As you can see, I'm grasping at straws here, but that's the nature of
    this kind of debugging expedition...

    Gene E. Bloch, Apr 18, 2006
  8. bjeanneb

    RS Guest

    Since the change in camcorders makes it go away, this suggests that the
    firewire connection on the camcorder in question has some sort of fault
    with it.
    RS, Apr 18, 2006
  9. bjeanneb

    bjeanneb Guest

    The original tape is OK and I finally actually got it onto the computer and
    am ready to edit. One of the things I did while trying to track down the
    problem was to remove the system from the APC battery backup and take the
    battery out of that device, then put it all back together. I had been
    having difficulty with that battery backup, trying to get it to start. It
    would squeal and blink but after shutting it down and restarting, it was OK.
    Now after the battery removal exercise, it is behaving properly. I also
    unplugged everything and replugged after untangling the cords the best I
    could. I'm dreaming of a wireless system! Thanks for your suggestions.
    I'll keep this message in case I have future episodes.

    bjeanneb, Apr 18, 2006
  10. bjeanneb

    bjeanneb Guest

    That would be odd because I have two firewire cords and they produced the
    same result. Anyway, I have now succeeded in importing my footage and am
    ready to edit. Thanks for your suggestions.

    bjeanneb, Apr 18, 2006
  11. Obviously I never would have thought of the UPS as a source of the
    problem. I'll keep *this* message, in case something similar happens to

    Was some of your equipment plugged into it, and other equipment not? It
    might be analogous to this: sometimes people have said that equipment
    that is connected together, but is plugged into separate wall sockets,
    can develop hum, but usually that would only be a problem if the two
    sockets were on separate branches of the house wiring - or if one was


    Gene E. Bloch, Apr 18, 2006
  12. bjeanneb

    bjeanneb Guest

    I have the modem, the CPU and a master strip plugged into the battery
    backup. It's been hooked up that way for a long time and had not been
    troublesome before. I have not recently added any hardware. I have dinked
    around with software, but that should not have caused the problem. I have
    my cable router and any programs that do things automatically unplugged when
    I'm working with video. Wierd, huh?

    bjeanneb, Apr 19, 2006
  13. Well, I have to go along with your diagnosis that it was the battery
    backup, even though I can't figure out how it could generate hum. The
    other questions were more curiosity - partly in the hope that your
    answer would make more sense to me. I hate it when I can't understand
    something :)

    This is my official name; I'll sign that way this time to rhyme with
    your name :)
    Gene E. Bloch, Apr 19, 2006
  14. bjeanneb

    bjeanneb Guest

    Well, I have to go along with your diagnosis that it was the battery
    Me too. I can't ignore the challenge. As I read somewhere, I paid for this
    computer and it's going to do what I want it to do, or something like that.

    bjeanneb, Apr 19, 2006
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