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  1. Even after trying to encode ac-3 with a professional encoder, I am getting bit depth = 16 most of time in some cases 20 with 4 extra bits, why?

    Raw WAV (PCM)

    Audio
    Format : PCM
    Bit rate : 1534 Kbps
    Channel(s) : 6 channels
    Sampling rate : 48.0 KHz
    Bit depth : 24 bits

    DTS

    Audio
    Format : Digital Theatre System
    Format/Info : DTS
    Bit rate mode : Constant
    Bit rate : 1534 Kbps
    Channel(s) : 6 channels
    Channel positions : Front: L C R, Side: L R, LFE
    Sampling rate : 48.0 KHz
    Bit depth : 24 bits

    Dolby Digital AC-3

    Audio
    Format : AC-3
    Format/Info : Audio Coding 3
    Bit rate mode : Constant
    Bit rate : 640 Kbps
    Channel(s) : 6 channels
    Channel positions : Front: L C R, Side: L R, LFE
    Sampling rate : 48.0 KHz
    Bit depth : 16 bits

    I have gone thru' collection of my original DVDs n BDs, but could not find DD AC3 audio with bit depth = 24.
    Why DD AC3 Bit depth = 16 bits??? Why not 24?
    Is there any technical limitation on ac-3 format?
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  2. aBigMeanie aedipuss's Avatar
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    because ac-3 specs say so. only Dolby TrueHD can be up to 24 bit.
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  3. Originally Posted by aedipuss View Post
    because ac-3 specs say so. only can be up to 24 bit.
    Thanks for the response.
    yeah u r right Dolby TrueHD supports bit depth up to 24 bits.
    but, Dolby TrueHD can only be supported in HD DVD or BD.
    anyways...has to stick with 16 bits for a while!
    Thanks!


    PS: its seems like LibA52 (aften) ATSC development team has gone on long summer vacation while i am looking for Free DD AC3 TrueHD encoder coz i do not have $$$$$$$$$ for TrueHD professional encoder.
    Last edited by Bonie81; 11th Jun 2011 at 00:41.
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    Originally Posted by Bonie81 View Post
    PS: its seems like LibA52 (aften) ATSC development team has gone on long summer vacation while i am looking for Free DD AC3 TrueHD encoder coz i do not have $$$$$$$$$ for TrueHD professional encoder.
    You may be waiting a LONG time. I'm sure that Dolby Lossless/True HD is covered by patents.
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  5. Originally Posted by jman98 View Post
    You may be waiting a LONG time. I'm sure that Dolby Lossless/True HD is covered by patents.
    yeaaaaah..., and that is the main reason DTS started leading in Blu-Rays : DTS-HD Master Audio Becoming the Blu-ray Standard
    anyway keep smiling with 640 16bits.
    Just in case anyone wants to go thru' "Digital Audio Compression Standard (AC-3, E-AC-3) PDF from the ATSC website"
    Last edited by Bonie81; 12th Jun 2011 at 20:23.
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    Why Lossless Audio Codecs generally suck


    http://codecs.multimedia.cx/?p=313
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  7. Originally Posted by jman98 View Post
    Originally Posted by Bonie81 View Post
    PS: its seems like LibA52 (aften) ATSC development team has gone on long summer vacation while i am looking for Free DD AC3 TrueHD encoder coz i do not have $$$$$$$$$ for TrueHD professional encoder.
    You may be waiting a LONG time. I'm sure that Dolby Lossless/True HD is covered by patents.
    So are AC3, AAC, MP3, MPEG 2, MPEG 4 part 2 (divx), MPEG 2 part 4 (h.264)... That doesn't stop open source versions from appearing.
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