3:2 Pulldown - Progressive Scan DVD?

Discussion in 'Archived Threads 2001-2004' started by Jim_Hunt, Jul 20, 2002.

  1. Jim_Hunt

    Jim_Hunt Extra

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    Are these the same thing or are they different?
     
  2. Adam Bluhm

    Adam Bluhm Supporting Actor

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    I don't believe they are the same. I can't give you a good explanation on them, but I'm pretty sure you can have 480p with no 3:2 pulldown. I'm not sure, however, that you can have 3:2 with no prog. scan. I believe 3:2 pulldown can help remove artifacts and what not.
     
  3. BruceSpielbauer

    BruceSpielbauer Second Unit

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    They are indeed different.

    480p simply refers to the 480 lines of resolution, and the fact that they are being "progessively" scanned, instead of "interlaced."

    3:2 Pulldown is a term for compensating for the fact that movies and films are shot at 24 frames per second. TV displays at 30 frames per second. When a movie is transferred to tape, a 3:2 pulldown has occurred because of this. However, this process causes line twittering and added video noise, particular on camera pans and scans, and in areas of high detail.

    The term 3:2 pulldown on a DVD player or on a TV set should actually be called: Reverse 3:2 Pulldown (it seems a lot of ads leave out the word "reverse"), also referred to as film mode deinterlacing. What this generally does is the processor looks at the "cadence" of the frames to see if it detects frames being repeated in the manner of the 3:2 pulldown and recombines the film frames properly. And, from what I have read, this can be done well or poorly.

    Thus, 3:2 pulldown is all about compensating for the fact that film and video are shot at different speeds.

    If video and film were both shot at the same speed, you wouldn't need to go through all of this 3:2 pulldown stuff. The 480p, though is quite unrelated to this. At least that is my understanding.

    Not an expert,

    -Bruce
     
  4. Vlad D

    Vlad D Screenwriter

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    What Bruce said.
    Here is a link, to an article that goes into great detail explaning how film is transfered to tape (3:2 pulldown) and then how a progressive scan DVD player makes a progressive image (de-interlacing).
     
  5. Jim_Hunt

    Jim_Hunt Extra

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    Thanks for all of your answers. I was having a serious case of brain lock last night and seemed to find information that was even more confusing.
     
  6. Jim FC

    Jim FC Stunt Coordinator

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    Bruce is correct, they are two completely different things. It just so happens, though, that most any DVD player that has 3:2 pulldown also is a progressive scan player, so if you get one, you're likely to find the other.
     

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