Sony TRV900 - Video Color is flashing (sample here)

Discussion in 'Amateur Video Production' started by Ken Roberts, Dec 9, 2005.

  1. Ken Roberts

    Ken Roberts Guest

    I am taking video of some lighted RGB fading objects. My Camcorder is
    what I always thought was a high-end device, the Sony TRV900. But for
    lighted colored objects it does a terrible job of reproducing what my
    eyes see, which are smooth, gradual fades of the colors from Red to
    Green to Blue, and all the colors in between.

    Here is a sample video of 3 "Oggz" which are very cool eggs with RGB
    LED's inside. They fade colors automatically and they do it very
    smoothly. By the video I took you can see the horrible artifacts

    Let me know if there is a fix - I doubt there is. I have tried many
    different lighting conditions, to no avail. Do the newer cameras do a
    good job of this? I wonder if I need to sell this and get a newer and
    better camcorder?
    Ken Roberts, Dec 9, 2005
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  2. No time to download your sample at the moment so some quick thoughts:

    Two things:

    1) Did you have your camera set to manual whitebalance? If not, it might
    start "pumping", and you get weird changes.

    2) The DV-codec sometimes gets confused when it has to deal with areas
    which have a very little change in tone. It starts to decide they are all
    of the same colour, and makes nice large blocks out of it.


    Martin Heffels, Dec 9, 2005
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  3. Nice web page. Too bad it didn't work for me with a Firefox browser.
    You might want to include a simple link to the video file as well.
    BrianEWilliams, Dec 10, 2005
  4. Ken Roberts

    Smarty Guest

    One of my TRV900s behaved this way, and the solution was to get it serviced
    by Sony.

    Smarty, Dec 11, 2005
  5. I couldn't view this at home, so I had to try it at the office.
    (You would get better response if you just gave a link to the
    WMV file rather than a fancy web page which apparently
    doesn't work for a lot of people.)

    I see two major things happening in the video...
    1) The white balance is jumping all over the place because
    it is apparently trying to track it automatically. Particularly
    with this particular subject matter, there is no constant point
    of reference. The white tabletop is illuminated by the changing
    colors of the device and the camera is desparately struggling
    for some constant reference. Suggest setting white balance
    with the device turned off and leaving it. No "auto-tracking"
    white balance.

    2) I see what I think is "strobing" (but hard to tell because
    it may be an artifact of the WMV compression?) I'd guess
    that the color LEDs are being driven by fast-switching pulses
    (which is how they control the "brightness") and the frequency
    of the clock is close to a critical video sync frequency. This
    is the same kind of thing you get when you try to shoot video
    of a CRT screen, etc.
    Richard Crowley, Dec 12, 2005
  6. Ken Roberts

    Ken Roberts Guest

    Yes, the page will work fine for anyone using IE and WMplayer, but
    apparently Firefox has problems with embedded Windows Media. For my
    main video page on that site I do just that - link the users to a
    separate page with direct links to the WMV files themselves.

    You might be right about the strobing effect, because by my human eye
    I see no such strobing at all, so maybe it is doing some of that.
    This camera looks so great in all the "normal" settings, but not with
    anything colored and lit up !!
    Ken Roberts, Dec 12, 2005
  7. It wouldn't work for me using IE 6.0 SP2 at home.
    It did work on both IE and Firefox at the office.
    Easy to check by just looking at the live video out of the camera
    even through the viewfinder, etc.
    1) Use manual white balance. That will take care of the colors
    wandering around.

    2) Try changing the "shutter speed" setting(s) to see if you can
    work around the strobing problem.

    No reason your TRV-900 should have any problem shooting
    your eggs.
    Richard Crowley, Dec 13, 2005
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