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Audio/Video sync issues back?

Discussion in 'DIRECTV HD DVR/Receiver Discussion' started by n3ntj, Nov 8, 2007.

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  1. Nov 9, 2007 #21 of 128

    methodtical15 New Member

    Jan 9, 2007
    add me to the list, been having problems ever since the update on most of the channels including mythbusters tonight, D* better get on this A.S.A.P!
  2. Nov 9, 2007 #22 of 128

    gulfwarvet Tips & Resources Collaboration

    Mar 7, 2007
    i guess add me to the list, my sat HD locals (all) is having this problem as well for the rest of HD channels. this is on both HR20-100 (0x1BE) & HR20-700 (0x1BE), connected with HDMI to the ONKYO receiver. pause & TP does not correct the problem.
  3. Nov 9, 2007 #23 of 128
    Carl Spock

    Carl Spock Superfly

    Sep 3, 2004
    Audio/video sync issues have never gone away.

    There is absolutely nothing in the entire HDTV chain that syncs the audio and video together. Nothing. And there are many buffers for both the audio and video before it gets to the front of whatever display your watching your TV on. Buffers in the TV itself, your DVR, the satellite, the uplink, the transmission lines to the uplink and the broadcaster. All have buffers that can get the audio and video out of sync and there is literally nothing you can do about making sure the audio and video sync after they get out of their respective buffers along the way.

    The best solution is some HT receivers have delays built into them to slow down the audio, which generally preceeds the video when things get out of sync, to match things up again. My Yamaha receiver can delay the audio up to 160 ms. I have to manually adjust it, and the adjustment is buried deep in the receiver's set-up menu, but at least I can compensate for sync problems.
  4. Nov 9, 2007 #24 of 128

    wrz0170 AllStar

    Oct 29, 2007
    Mythbusters here too..... we didn't try any of the possible fixes because it was a recording.
  5. Nov 9, 2007 #25 of 128

    smimi10 Legend

    May 22, 2006
    Add me to the list here, too. Discovery HD is where I noticed it, but that's the channel I watch the most, too.
  6. Nov 9, 2007 #26 of 128

    Splendor Legend

    Apr 17, 2007
    WTF? How could they have not added an audio/video sync to the HDTV broadcast standard? :mad:
  7. Nov 9, 2007 #27 of 128

    ljp416jmp New Member

    Jan 25, 2005
    I agree, the Weather Channel HD is always out of sync....will try the double pause trick...but in the meantime, you can watch Alexandra Steele do her soft porn bit along with the other Weather Channel babes.
  8. Nov 9, 2007 #28 of 128
    Carl Spock

    Carl Spock Superfly

    Sep 3, 2004
    It was sort of hard to require the two to sync back in the early days of HDTV when there was no standard.

    Back in the 1990s, the FCC's stance was let the marketplace battle it out. I remember an early Sharp HD tuner that had to handle a couple of dozen different input resolutions and scan rates because the FCC wouldn't standardize anything. It was an open battleground. Zenith's AC-3 5.1 surround system became the sound system only by default (yes, Dolby didn't develop 5.1 - Zenith did). Again, if I remember right, it had competitors although the market wasn't nearly as fractured as the video side. As various broadcasters started adopting 4:3 scan rates of 480i and 480p, and 16:9 rates of 720p and 1080i, these became the norm. But they aren't the standard. My memory also says there was a group pushing for a high resolution 4:3 picture using 720i. They didn't get very far.

    For more revealing info on audio sync, read texasbrit's two outstanding posts in this thread: linky
  9. Nov 9, 2007 #29 of 128

    Bobby42 Cool Member

    Apr 17, 2007
    I also had bad audio sync problems on this weeks Mythbusters in HD episode. I watched it after it was completely recorded, and nothing I did helped sync the audio better.

    I've only seen audio sync problems on MPEG4 channels, both hd locals and the new HD channels like Discovery HD.

    I understand HD has audio sync problems in general, but I've not experienced the same level of problems with other available HD sources. I get audio sync problems over HDMI and component on my HR20.

    To me, this is either an issue with the receiver or the feed.
  10. Nov 9, 2007 #30 of 128

    JasonK94Z Mentor

    Jul 16, 2007
    So has anyone called DirecTV about this? If so, what are they saying?
  11. Nov 9, 2007 #31 of 128

    saleen351 Godfather

    Mar 28, 2006
    +1 myth busters
  12. Nov 9, 2007 #32 of 128

    marksrader AllStar

    Sep 14, 2006
    Yes Mythbusters problem too... pause, change channel, back-up... nothing ever cleared it. :bad_nono:
  13. Nov 9, 2007 #33 of 128
    Carl Spock

    Carl Spock Superfly

    Sep 3, 2004
    Since the biggest problem was this one episode of Mythbusters, couldn't the problem just as likely have occurred back at the Discovery Channel? Maybe it was out of sync from the get-go.
  14. Nov 9, 2007 #34 of 128

    RoundRockJohn Legend

    Apr 24, 2007
    I was having the same problem with my HR20-700, it was almost unwatchable. Nothing I did fixed it.
  15. Nov 9, 2007 #35 of 128

    veryoldschool Lifetime Achiever Staff Member Super Moderator DBSTalk Club

    Dec 9, 2006
    Now why would you think that? :lol:
    [the only occurrence I've had in many many months].
  16. Nov 10, 2007 #36 of 128

    flipptyfloppity New Member

    Aug 20, 2007
    You are talking about a different problem.

    You're talking about processing errors in the system, not DTV sending it out of sync.

    My system is fine, I can watch many different HD sources and they're all in sync. It's only a few channels on DirecTV that are out of sync. So the problem is on DirecTV's end.

    In the shortest possible terms, if the audio/video sync on one D* channel is (say) 30ms, it shouldn't be 530ms on another. If it is, there is something wrong either at D* or upstream and it is their job to correct it.
  17. Nov 10, 2007 #37 of 128
    Carl Spock

    Carl Spock Superfly

    Sep 3, 2004
    Certainly I want D* to give me programming as in sync as is possible. I want them to correct any problems they can in there own house

    - but -

    how have you determined that this problem with Mythbusters didn't originate with the Discovery Channel? It actually makes the most sense to me. If you told me all of that night's Discovery Channel programs were out of sync I might be more likely to put the blame at D* door step. But just one program? What special switch did D* throw for just that one program that resulted in it being out of sync?

    I'm being facetious but doesn't it make the most sense that when they played the tape at the Discovery Network (OK, I know were probably talking about hard drive space here, not tape), it was out of sync initially. The program is the thing that changes hourly, not D* broadcast.

    Does anybody remember - were the commercials this hour in sync? That would tell us something.

    What we need is a control. Somebody should pop for HDTV service by D*, E* and their local cable company. That way if a show is out of sync, the status of the other services could be compared.

    Who volunteers to do this? :D

    As for it being D* job to correct problems up stream, I don't think so. Can you imagine the job monitoring all the thousand or so channels they rebroadcast 24/7, and in real time, correct for any mistakes they see? I'm sure it's hard enough to keep things going without adding more errors.
  18. Nov 12, 2007 #38 of 128
    Guitar Hero

    Guitar Hero Godfather

    Dec 13, 2005
    OK, I didn't have a problem yesterday, or on the 8th like most of you, but I sure do have a audio sync problem right now. It's really bad!

    No fix, so far. Changing channels, turning off Dolby, then back on again, turning off the receiver, nada. Anybody else have a problem tonight?

    The problem starts off slow, then progressively gets worse. Right now, I say I have a good one-and-a-half second audio sync problem. I've never seen it this bad before.

    Got a fix that works? Reset? What?
  19. Nov 12, 2007 #39 of 128

    Bobby42 Cool Member

    Apr 17, 2007
    So I should just accept that for $70+ a month, I get out-of-sync audio? I don't think so.

    I pay DirectTV, not Discovery. DirectTV resells the feed from Discovery. I complain to DirectTV, they work with Discovery to fix the issue. That's how it should work.

    They don't need to monitor all the channels like you say, but they should be responsive to customers who tell them about issues.
  20. Nov 12, 2007 #40 of 128
    Carl Spock

    Carl Spock Superfly

    Sep 3, 2004
    I don't disagree. I never said DirecTV shouldn't be responsive and pass along your concerns.

    We all want DirecTV to be address our concerns. My point was it simply might not be theirs to directly fix.
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