SONY TRV-900 Flashing Color and TV Capture

Discussion in 'Amateur Video Production' started by Ken Roberts, Jan 19, 2006.

  1. Ken Roberts

    Ken Roberts Guest

    I posted earlier about my SONY TRV-900 footage of a few "Oggz" that I
    have - which are just plastic eggs that slowly change color. I get a
    lot of color flashing. The eggs are apparently using a PWM
    controller, which my camera cannor synch to. The reason I say this -
    is because I also have some slow color-changing LED's and when I
    placed one inside a ping-pong ball to simulate the egg, my camera
    takes smooth footage of them.

    To extend this problem - I get the well-known flashing and/or rolling
    effect of filming TV - those 60-cycle artifacts. If I could figure
    out how to film TV, then I could probably use the same technique to
    film these Eggs. Thanks;

    Ken
     
    Ken Roberts, Jan 19, 2006
    #1
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  2. You have been recommended before to use manual white-balance. Did you
    forget already?
    Try a slower shutter-speed, but this will become messy. Actualy you would
    need a clear-scan shutter-function, which is not available on a TRV900.
    Better record the program to tape, and then capture in your computer. The
    quality will probably be better as well.

    cheers

    -martin-
     
    Martin Heffels, Jan 19, 2006
    #2
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  3. You would be much better off taking a series of still pictures
    of the Oggz in each color phase and then do a dissolve between
    the various color still shots. You could even do it quite effectively
    as an animated GIF. It would look exactly the same on the screen
    without the whole mess of dealing with the PWM sources.
     
    Richard Crowley, Jan 19, 2006
    #3
  4. Ken Roberts

    Ken Roberts Guest

    Yes I tried Manual white balance and it had no effect on the problem.
    Actually, I set everything to manual, following the User Guide
    instructions . . . one setting at a time and then checked the results,
    But could not fix the problem.

    To record the program to tape (I assume you mean from the existing DV
    tape that it is on, to analog VHS tape?) would just send the existing
    footage from MiniDV to VHS. It might have some smoothing in the loss
    of quality but it should for the most part replicate what I have on
    the DV tape (i.e. flashing color). My capture card is DV only,
    although I do have a Canopus ACDV to convert VHS to DV firewire
    capture. So I woud then have to convert back from VHS to DV format
    and then capture via firewire into AVI. I do not see how that would
    get rud of the synch issues that exist on the original recording.
     
    Ken Roberts, Jan 21, 2006
    #4
  5. Ken Roberts

    Ken Roberts Guest

    Ken Roberts, Jan 21, 2006
    #5
  6. Generally you set the white balance just once, based on the what you decide
    should be white, and the rest should follow. Meaning that every colour
    should look ok. If your cam is set to manual, it shouldn't change at all
    anymore.
    Just to make this clear for me, are you having the tv somewhere in the
    corner, and see the rolling bar? Or are you trying to record straight from
    the screen? In case of the latter, use a tuner, and record directly to tape
    or camera or computer.
    For the first, you need to use a slower shutter (1/50th), or use a camera
    which has a ClearScan function. And that would typically be a broadcast
    type of camera.

    cheers

    -martin-
     
    Martin Heffels, Jan 23, 2006
    #6
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