watchable video quality. min video bit rate?

Discussion in 'Amateur Video Production' started by Brian, Feb 7, 2004.

  1. Brian

    Brian Guest

    I'm told it's possible to reduce the bit rate quality of a video to
    fit more video onto a CD.
    I know that a VCD has a set video rate of 1152Kbps but if I recorded
    video onto a CD at a lower video bit rate such as 750Kbps would I be
    able to play it in a DVD player?
    Does anyone know approx the minimum video bit rate before the picture
    becomes unwatchable?

    Regards Brian
     
    Brian, Feb 7, 2004
    #1
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  2. Brian

    Martin Guest

    Consider the bits per pixel of an encoded movie.

    I use a little utility called Aspect
    It's a bitrate calculator basically, but it also takes your video's
    properties - resolution and duration - to calculate a bits/pixel value.

    Aspect's help file states:
    ' Compressed video quality.
    To achieve good video quality bit/pixel value must be kept at the level of
    0.15 or higher. If you get lesser value, either increase movie size (burn it
    on two cds instead of one) or decrease frame size.'

    So you adjust Aspect's various settings until you get a good combination and
    a good bits/pixel value - then it's time to encode :)
    Aspect can be found here
    http://www.geocities.com/vestadomain/videoutils.html

    You might also want to look at www.dvdrhelp.com
    Burning a VCD with a 750kbps birate is known as XVCD.
    750kbps sounds like the sort of bitrate i'd use to get a 90 min movie on a
    single CD.
    My DVD player plays back through a lo-fi mono tv so i use low bitrate mono
    audio and that gives the video a bit more bits (per pixel).
    2 pass VBR is best - TMPGEnc works great.

    The lowest bitrate your DVD player can handle depends entirely on it's
    specifications - if you have a manual look there, or back to
    www.dvdrhelp.com and look up your DVD player in it's player database.
    I'd guess that 300kbps VCD would be an absolute minimum.

    HTH.

    Martin.
     
    Martin, Feb 7, 2004
    #2
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