progressive/interlaced discs!!

Discussion in 'Movie Forum' started by samjet, Nov 1, 2005.

  1. samjet

    samjet
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    this has got me confused

    only recently been using the info button when discs are playing - although i have the progressive scan switched off the player (plasma does a better job) some discs show as progressive and some as interlaced

    what does this mean exactly please??
     
  2. anephric

    anephric
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    They'll have progressive flags encoded on the disc to let the player know the video is encoded progressively (for a true progressive scan picture). Interlaced transfers won't.

    For more info on what PS actually is/does, the search tool is thine chum.
     
  3. Mr.D

    Mr.D
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    All commercial dvds are interlaced. Its probably detecting some sort of pulldown flagging.
     
  4. Reiner

    Reiner
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    Isn't it that the flag tells the player to output a progressive picture, interweaved from the interlaced pictures frames (or is it fields?) on the DVD?
     
  5. Mr.D

    Mr.D
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    The player can read the flagghing to identify 3:2 pulldown repeat felds . The data on the disc itself decodes as interlaced video . This then has to be deinterlaced either in the player itself or the display or a standalone deinterlacer.

    The deinterlacing method can be chosen in a number of ways....flag reading ( works well as long as the flags are corrects and the flags themselves are not there primarily for deinterlacing but to make encoding the original material easier/ more economical).

    Auto detection : the player looks for the high frequency picture signature indicative of mismatched fields to decide on whether to use a film or video deinterlace and also looks for a regular repeat 3:2 pulldown/2:2 pulldown structure.

    Adaptive (primarily of use only for video or film material that has had its field structure destroyed). Essentially the deinterlacer will cue on movement: little movement will do a straight weave ; good resolution but mismatched field artifacts on moving features and bob: resizes each field to be full height and displays each field as a frame: no interlaced artifacts regardless of material but you are only ever seeing half the available resolution albeit all the temporal information.
     

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