How is audio encoded on a DVD?

Discussion in 'DVDR' started by Room101, Aug 2, 2005.

  1. Room101

    Room101 Member

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    Hi.

    [bold]Things I know.[/bold]

    1 - CD audio is not compressed. When you rip a track from a CD you create (either physically or virtually) a WAV format file.

    2 - My MP3 files are on average about 1/12 the size of the original WAV file.

    3 - DVDs can hold a LOT of files!

    4 - My DVD player cannot play MP3 files or DVDs based on a file system - only real DVDs and DVD+/-Rs.


    [bold]Things I think I know.[/bold]

    1 - MP3 is something to do with the way audio is encoded into a video for DVD.

    2 - A DVD with JUST audio (and maybe a few simple menus and / or album cover scans) SHOULD be able to hold a LOT of audio!

    3 - A DVD with JUST audio and a DVD player with a track shuffle would make a GREAT jukebox!

    4 - I am NOT talking about DVD-Audio. This is the new(-ish) format for encoding high quality surround sound onto a DVD sized disk. Requires speclialised hardware to reproduce it.


    [bold]Thoughts[/bold]

    If a single layer DVD can hold 4.7GB of data and if this data was MP3 files, then, theoguessingly

    4.7GB * 12 (factor of MP3->WAV) => 56.4G of WAV files.

    1s of WAV is 176400 bytes (44100 sample rate, 2 channels, 16 bits).

    So, 4.7G of MP3s is possibly 319728s of WAV.

    5,329 minutes.

    88 hours.

    3.7 days!!!!


    [bold]Question[/bold]

    Is it actually possible to put compressed audio onto a DVD in such a way that a NORMAL EVERYDAY REAL DVD player (not a pc, not one that can play MP3s, etc) could play it?


    I have heard of a program called AudioDVD. This program only uses uncompressed audio.

    Regards,

    Richard.
     
  2. bbmayo

    bbmayo Active member

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    Best advice I can give is go to WalMart and get a 39$ DVD player that supports MP3 as far as I know there isn't anyway to trick your DVD player that isn't compatable with MP3 into playing MP3's..

    Cheers
     
  3. Room101

    Room101 Member

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    I think you missed the point of the question.

    MP3 is a final form of WAV.

    WAV is my start point (either microphone or ripped from CD).

    I can't imagine that sound is uncompressed when it is part of a DVD.

    If it was uncompressed, you could get nearly 7.5 hours of uncompressed audio onto a DVD.

    Even that would be a start!

    Richard.
     

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