Is sky+ DD5.1 sound the same as DVD?

Discussion in 'Sky Digital TV Forum' started by Ash007, Feb 12, 2002.

  1. Ash007

    Ash007
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    If a Sky+ film is sent in DD5.1. Should the sound quality be identicle to that of the same film watched on DVD? If yes, will it still be the same if i record it and play it back?
    I guess the picture quality wont be as good as (i think) the resolution is less. Is this correct?

    Cheers,
    Ash
     
  2. Starburst

    Starburst
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    There is no reason why SKY DD5.1 should not be as good as DD5.1 on a DVD. Of course satellite transmissions depend on many variables any of which if below par could effect the final result while a DVD source is constant.

    SKY+ will record a DD 5.1 soundtrack if there is one present and then play it back exactly the same as the original broadcast.

    A SKY+ recording is identical to the original broadcast, but that original broadcast is a result of mpeg2 compression which at the current level of technology/investment can not match a well encoded DVD release of for example the same movie.

    As far as I know the only practical difference between a PAL DVD and a UK digital broadcast picture quality wise is the amount of compression used. Resolution and number of Scan Lines are the same.
     
  3. Ash007

    Ash007
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    So "Gladiator" that i recorded the other night on to my sky+ hardrive should be pretty much indistinquishable from the DVD. Correct?
     
  4. mart.stokes

    mart.stokes
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    I would be interested to know if Sky use the same data speed for DD 5.1 as DVD does (of course the speed even varies between different films on DVD). I don't know how we would find this out without specialist equipment, I don't know of any domestic DD amps that inform you of the transfer rate.
     
  5. Starburst

    Starburst
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    In and ideal world yes it should be.
    BUT....
    Gladiator probably took as long as was deemed neccesary to master the disk ready for duplication.
    Most of this time was taken up with the mpeg2 compression to optimise picture quality and disk capacity.
    SKY will have a master copy of the movie and then compress that more or less on the fly, this process can not at this time produce the same results as a compression specialist taking weeks to encode a movie.

    From my last three years of subscribing to the movie channels they do seem to run at nice high bitrates so the picture quality is pretty good but I would never compare it to a DVD source:)
     
  6. Neil69

    Neil69
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    The picture quality on Gladiator is superior on DVD because when Sky showed it, the sides were chopped off. On DVD it is in 2:35.1 aspect ratio, on Sky it is in 1:85.1. The Dolby track is similar as both are in Dolby Digital Surround EX.
    Cheers, Neil
    :clown: :clown: :clown: :rolleyes: :rolleyes:
     

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