Why do some transfers seem jittery?

Discussion in 'DVD' started by JohnKings, Oct 23, 2003.

  1. JohnKings

    JohnKings Stunt Coordinator

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    Hello all:

    Can someone explain to me why some transfers just seem to jitter more than others? Some movies seem so steady and others the picture seems to jitter quite a bit. Is jitter generally a function of the media, the hardware or the display or could it be a combination of two or all three?


    I though at first that it was my DVD player or my TV, but I believe that I have confirmed that it is the software by playing the suspect dvds in two other players(utilizing two other displays) including my PC DVD-ROM drive and seeing the same issue.

    Thanks for any information.

    John
     
  2. JohnKings

    JohnKings Stunt Coordinator

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    In case anyone cares, after reading up on this topic it appears judder is an artefact of the 3:2 pulldown conversion. It apparently exists to some degree on most dvds where film based media is being converted for viewing on TV.
     
  3. Steve Tannehill

    Steve Tannehill Ambassador

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    A few thoughts:

    1) Excessive alcohol. [​IMG]
    2) What playback equipment are you using? Progressive scan DVD player? Line doubler? Digital television?
    3) What DVD? What chapter/time? Is the DVD enhanced for 16x9 televisions? Is it playing back on a 16x9 television?

    - Steve
     
  4. JohnKings

    JohnKings Stunt Coordinator

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    My setup is as follows:


    TV: Hitach 51S700
    DVD: Panasonic XP50
    Cables: Acoustic Research Master Series Component (12 Ft.)
    DVDs: Dances with Wolves, Baby's Day Out, Opening Scene of Resident Evil (panning in on laboratory) and others!

    I am very certain that this fairly hard to notice on anything other than a big screen. Also, I belive that I am very sensitive to jitter/judder.
     
  5. Robert Dunnill

    Robert Dunnill Second Unit

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    The transfer quality has a lot to do with it; for example, Image's Doomwatch has a lot of problems here, while their Ms. 45 is rock-steady. Same player, same display.
     
  6. Andy_G

    Andy_G Stunt Coordinator

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    Could it be that the telecine has a loose gate?
     
  7. Jonathan Perregaux

    Jonathan Perregaux Screenwriter

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    During the process when a film print is scanned and converted into a digital format, reels of film must be played back through a telecine machine. If the film sprocket holes on the print happen to be worn or, as Andy G. suggested, the telecine machine itself has a loose gate, then the film will wiggle slightly as it passes in front of the aperture. I noticed this on a few DVD's, including Ben-Hur.
     

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