DirecTV DD Audio dropouts

Discussion in 'Archived Threads 2001-2004' started by StanT, Jun 7, 2002.

  1. StanT

    StanT Auditioning

    Feb 8, 2002
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    The other night while watching The Cable Guy on HBO (DD), the audio would drop out for a split second several times throughout the movie.

    Following this I watched Cast Away on the same channel, also in DD, and did not have any audio problems. So, for kicks, I switched over to the other HBO feed and watched a few minutes of The Cable Guy again to see if the problem returned. Sure enough, the audio problem started again on this movie.

    I have also noticed it on Shrek. There are no picture problems. It only seems to happen in DD. Could it be something about certain movies? Any ideas?
  2. Jeffrey_S

    Jeffrey_S Stunt Coordinator

    Jan 17, 2002
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    I have a DirecTV Tivo unit. I have also noticed some dropouts during DD encoded movies. I'm not sure if it was restricted to HBO as it may have been Starz or another service as well. The several times that it has happened, I have rewound and played that segment again to make sure it wasn't my pre/pro that was dropping audio and it wasn't. I'm not sure if this has something to do with satellite interference or what. But rest assured that you aren't the only one experiencing this periodic problem.

  3. Steven Simon

    Steven Simon Producer

    Sep 14, 1998
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    Real Name:
    Steven Simon
    This has nothing to do with Hardware..... It's stemming from HBO..... I have the same problems with the 5.1.
  4. Chris Sharp

    Chris Sharp Agent

    Dec 25, 2001
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    AHHHH! This is good to know. I just posted a similar question thinking it may have had to do with the Onkyo receivers and their DD dropouts on certain DVDS including JPIII, Pearl Harbor, Atlantis, etc....

    So you are saying this is related to the service provider and NOT our precious receivers or pre/pros....good to know.

    When are these service providers going to start PROVIDING what we pay for?!?

  5. JoeyB

    JoeyB Agent

    Dec 31, 2001
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    I had dropouts with HBO broadcast of Shrek on my Onkyo 797. Previous posters: what receiver are you using? I hope this isn't another Onkyo problem.
  6. WesleyHester

    WesleyHester Stunt Coordinator

    Feb 14, 2002
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    Selma, AL
    Real Name:
    John Hester
    I too had audio dropout during The Cable Guy with my Onkyo 797.

    It's not ANOTHER Onkyo problem, it's one of the same ones. Remember, the same problem with certain DVDs CAN be in satellite and OTA broadcasts too.
  7. DanielSmi

    DanielSmi Second Unit

    Mar 20, 2002
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    Here's a copy of an article from the dolby website that talks about the dd dropout problem:


    Can you give me more information about the difficulties in listening to the Dolby Digital soundtrack on certain new DVDs?


    Dolby has been actively investigating this issue recently, and has identified specific conditions that cause audio dropouts when the Dolby Digital soundtrack is played. The audio dropout problem is caused by an incompatibility between a new set of features added to the Dolby Digital system and certain makes and models of A/V receivers.

    Dolby has regularly incorporated improvements in its professional studio encoders by means of software updates. In our most recent Dolby Digital encoder release, Dolby added several new parameters to the Dolby Digital bitstream, including (among other items) a Dolby Digital Surround EX flag.

    Unfortunately, certain makes and models of A/V receivers contain incompatibilities that cause them to suffer audio dropouts in the presence of these new bitstream flags. Dolby has seen several reports of such problems, and we are still in the process of identifying all of the root issues. However, we have confirmed and characterized one specific problem that seems to be the most widespread.

    Specifically, in some receivers, the digital signal processor (DSP) chip responsible for decoding the Dolby Digital bitstream triggers a control signal output whenever the new bitstream flags are present. In many products, this control signal is active but causes no audio problems. In other products, the receiver responds to this control signal by momentarily muting the audio outputs. This results in frequent audio dropouts (or even continuous muting) whenever the new bitstream flags are encountered.

    As soon as these incompatibilities were identified, Dolby contacted all major DVD authoring facilities and encouraged them to switch off the new bitstream flags as a means of preventing further incompatibilities with the affected decoders. Dolby has also been working closely with the manufacturers of the hardware products and components to fully understand the problems and identify potential solutions in these areas.

    Currently, only a small handful of DVD titles have been released using the new bitstream flags. It is worth noting that none of these titles were mastered incorrectly—the Dolby Digital soundtracks on these discs were created properly in accordance with the new bitstream syntax specification. However, because this new syntax is not compatible with all A/V receiver products, both Dolby and the DVD content industry are working together to avoid releasing any further content in this format.

    If you experience audio dropouts while playing a recently released DVD, you probably have one of the affected receivers. There are four different ways you can still enjoy the picture and the sound.

    1) Change your DVD player configuration to play PCM digital audio instead of Dolby Digital audio through the digital output jack. This way you do not need to change any wiring in the system. Just remember to set it back to play Dolby Digital audio after the movie! (See your DVD player manual for specific instructions on how to change this setting).

    2) Connect your DVD player’s analog audio output jacks to the analog audio inputs on your receiver. Then select the analog audio inputs instead of the digital audio inputs while watching the movie.
    Methods one and two both allow you to listen to the DVD soundtrack in stereo; or you can turn on Pro Logic or Pro Logic II in your receiver for excellent surround sound effects.

    3) If your DVD player has 5.1-channel analog audio outputs, and your receiver has 5.1-channel analog audio inputs, you can connect these together to enjoy fully discrete multichannel sound.

    4) If the DVD disc has an alternative soundtrack option, this may also be used.

    On behalf of our customers who own affected receivers, Dolby and its partners are continuing to work together to identify alternative solutions to this problem. For example, Dolby is currently developing a new version of encoder software that allows the Surround EX flag to be used on future DVDs in a way that is compatible with all existing A/V receivers. This new encoder release will provide a longer-term solution enabling everyone to enjoy Dolby Digital DVD soundtracks, whether they are mastered in stereo, 5.1, or Dolby Digital Surround EX.
    In addition, Dolby and several consumer electronics manufacturers are working to develop a hardware box capable of modifying the Dolby Digital bitstream so as to avoid triggering audio dropout problems in existing decoder products. Further details regarding this solution will be provided as it becomes available.

    hope this helps
  8. Wes Stover

    Wes Stover Stunt Coordinator

    Nov 26, 2001
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    Here is a reply from Onkyo on this very topic.

    Thank You for contacting Onkyo USA Product Support.

    The latest upgrade will fix the audio drop outs on DVD movies with the
    Dolby Digital problem.

    It does not address the issue with Satellite drop outs. Dolby Laboratories
    and the satellite companies are researching the issue right now.

    Again, thank you for contacting Onkyo USA Product Support,
    if you need further Assistance feel free to call us at 800-229-1687.

    Comments: Will the latest upgrade for TX-DS989s fix the Dolby digital
    problems encountered with some DVDs and satellite transmissions?

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