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ViP622/ViP722 - L5.12/L6.10/L6.12/L6.14 Audio Related Issues Discussions

Discussion in 'ViP612/622/722/722K DVR Support Forum' started by Ron Barry, Jul 8, 2008.

  1. snappingturtle

    snappingturtle Cool Member

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    Dec 19, 2007
    I too am experiencing dolby digital audio problems with HI-DEF channels on my 722. I have a Yamaha RX-V2700 receiver. Using HDMI.

    Curious about the extent of this problem, I dusted off my hdhomerun ( a hd digital tuner capable of streaming over the network ) and configured mythtv to use it on my pc. mythtv is an opensource PVR software for linux. I have AC3 pass-through enabled for dolby digital. When I tune to ABC-7 or KTVU-2 it has severe audio dropouts, worse than dish. I have a very minimal comcast subscription ($1 extra) because I use them for internet service. I do not have audio drop-outs on any other channels on my hdhomerun. From my pc to my receiver I use optical for audio and HDMI for video. I'm using a DVI to HDMI cable here. HDMI sends video to my TV, a sony KDL-46V3000

    I can watch NBC-11, KQED-9, KQED-ENCORE and the CW-44 in HD AC3 absolutely perfectly on the hdhomerun.

    I have never tried over the air with the 722 or the hdhomerun. Maybe I'll try that when I get a chance but I don't think I can pick them up where I live.

    This audio problem is quite vexing.

    I have no idea if my observation regarding the hdhomerun is coincidental and just a red herring or not, but I find it highly suspicious. I also wonder if newer 722 software is just coincidental with some recent equipment changes that broadcasters are starting to use.

    I have emailed engineering at both broadcasters just yesterday. No progress so far.

    Maybe it has something to do with Yamaha. I have access to an old denon reciever that I can try. It has optical audio, but no HDMI. So I would have to attach hdmi directly to the Sony.

    :nono2:
     
  2. kstuart

    kstuart Icon

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    Apr 25, 2002
    You never quite come out and say it, only implying it through a maze of technical equipment discussions...

    Are you having these same audio dropouts on ABC-7 and KTVU-2 using Comcast cable feed instead of Dish Network's feed ?

    If so, are the dropouts worse when there is very little motion - such as a graphics screen of standings or upcoming programming, etc. ?

    If so, does Comcast use MPEG-4 for HD local channels ?
     
  3. HobbyTalk

    HobbyTalk Hall Of Fame

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    Jul 14, 2007
    I have now had about a dozen dropouts while watching the olympics on NBC tonight. This is live and not recorded programming
     
  4. phrelin

    phrelin Hall Of Fame DBSTalk Club

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    Jan 18, 2007
    Northern...
    I too have a Yamaha RXV2700 AV Receiver, but based on the number of complaints on the Bay Area Folks: Audio drops on Fox and ABC thread, I don't think it is our Yamaha's. And my connection is component/optical audio and still have dropouts.
     
  5. snappingturtle

    snappingturtle Cool Member

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    Dec 19, 2007
    I'm just trying different things with equipment that's available to me. I didn't mean to make it sound too technical. Comcast uses MPEG-2 in my area.

    I just connected an optical cable from my tv to my receiver with cable attached to the sony. No audio dropouts. I should have tried this before messing with myth and the hdhomerun! :lol:

    So I guess my little experiment with cable and the problems I observed with myth apparently have nothing to do with what we're seeing on the 722.
     
  6. snappingturtle

    snappingturtle Cool Member

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    Dec 19, 2007
    I know replying to self is bad, however this may be important.

    While messing with mythtv and comcast, I have noticed that playback problems somehow relate to 720p vs 1080i playback. 1080i is fine, but 720p has severe playback audio/video studder.

    The correlation between myth/cable and what we see on the 722 may, in fact, be that there can be issues with 720p playback or in some way related to the way video is upscaled.

    I wish the 722 told us a little about broadcast feed on screen.
     
  7. mulder5000

    mulder5000 AllStar

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    Jul 8, 2006
    Snappingturtle might be on to something.
    Based on a quick search, it looks like the other 720p channels are ESPN, ESPN2, and National Geographic. I watched each channel for about 15 minutes (delayed by about 30 seconds) and noticed 1 dropout on ESPN. ESPN2 and National Geaographic were fine, but if I would have done a longer test they may have had problems, too.
    Since I never watch those 3 channels, it could explain why I think/thought the problem was limited to ABC and FOX.
     
  8. phrelin

    phrelin Hall Of Fame DBSTalk Club

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    Northern...
    Well, it could be the 720p channels, but there are posts like the one below and I've seen some NBC dropout on the Olympics:

     
  9. mulder5000

    mulder5000 AllStar

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    Jul 8, 2006
    There might be more than one bug at work here because I have yet to experienced problems with live tv.
    Phrelin, do your dropouts occur live, like HobbyTalk, or only on delayed/recorded programs?
     
  10. olguy

    olguy Hall Of Fame

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    Jan 9, 2006
    To add a bit of confusion here, I had some audio dropouts during the final credits of I Am Legend tonight on 501. And I have them bad on the local news on Houston's ABC affiliate. Haven't checked to see if it is a 720p or 1080i and we aren't watching anything on ABC this summer so don't know about that.
     
  11. mulder5000

    mulder5000 AllStar

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    Jul 8, 2006
    I bought and hooked up an OTA antenna today and am happy to report my local FOX station has no audio dropouts when delayed/recorded. I recorded the same program through the SAT locals for comparision and the dropouts were there.
     
  12. moman19

    moman19 Icon

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    Oct 22, 2004
    The biggest offender when it comes to Audio dropouts are Soundstage recordings I have stored on my EHD from the old VOOM Rave channel. It was 1080i so that pretty much kills the 720p theory. I restored a concert to the DVR to see what would happen. The dropouts remained.
     
  13. rexa

    rexa AllStar

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    Aug 7, 2008
    OK. This one is really weird.

    Was watching the ABC 7 local news at 11 PM. At the end of the show when it should have changed to advertisments and then Nightline, there began a strange broadcast.

    I heard something like, "This is a network test and should not be broadcast." But it was, and then a woman announcer talking about, "bananas", and a bunch of odd stuff where the sound and lip sync should be pretty obvious.

    Wow, odd. And the sound was out of sync, which is a pet peeve, but off topic for this thread.

    Then a really strange test pattern. Then I thought, "why am I not recording this great event?" So I started. But it had already changed to a vertical color bar pattern with "ABC NY HD" printed across it and an audio tone. Then it switched to a 5.1 audio test with a fixed graphic where the audio switched between channels... "this is left channel... this is right channel ... " etc. Then the regular programming resumed and I stopped recording.

    Ok. I was watching this on the satellite channel of my local ABC (one of the problem channels). While I was listening to this real-time all the audio was ok except for the audio sync problem (yeah, that sucks too, but a different problem.)

    So I played back the recording. [I SO wish I had the whole mistaken broadcast, but I didn't.] That vertical bars screen started up with the constant tone in the background, except that the tone had big noticeable drops every few seconds.

    Then it switched to the 5.1 audio test. Randomly, every few seconds as the sound switched between channels, there were our dropouts.

    I only add this message because the programming was so strange and because the captured failures during test patterns are so obvious.

    P.S. Eventually we should start an audio sync thread, but the problems are so many and so varied and probably from various problems in all parts of all systems (not just Dish) that the thread would be only to make us all feel better by sharing our pain.
     
  14. rexa

    rexa AllStar

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    Aug 7, 2008
    Thinking about my last post, I start wondering if this was staged for our diligent Dish engineers to get a handle on the situation. I sure hope so. If that happens to be true, and they didn't catch the problem, I certainly have a recording to use as an example.

    What ever the reason for the odd test broadcast, there must be a few unhappy advertisers who missed their ~11:30 PM slot. Dang, now I am wishing that I checked real quick to see what was being broadcast OTA.

    Oh well, glad I've caught a bit of it.
     
  15. peakejef

    peakejef New Member

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    Nov 6, 2006
    I have skimmed this post and I think my audio issues are a bit different. Any help appreciated.

    I have a 622 hooked up with optical to my receiver. Once or twice a day, I lose all audio from the 622. Live TV (HD/SD/everything) and recorded shows have no sound.

    The only way I can get sound back is to unplug the power from my 622 and plug it back in.

    I was hoping a software update would fix this, but it has been happening with the last few updates and doesnt appear to be going away.

    Help!

    Thanks

    Jeff
     
  16. Ron Barry

    Ron Barry 622 Tips & Trick Keeper

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    Dec 10, 2002
    In reading the thread.. something is not clear so here is a follow up question.

    Are the audio drops are still present upon skip back and are they still present if you skip back about 2 minutes and play it through the area of the skip? IF they are present, are they in the exact same location or do they appear to be random.
     
  17. Ron Barry

    Ron Barry 622 Tips & Trick Keeper

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    Dec 10, 2002
    Definitely a different issue Jeff.. When this happens have you tried to see if the sound loss is both on SD and HD content. Also, are you directly connected through your TV or through an A/V receivers. One thing you can do to narrow the problem is to also check if there is no audio coming out of your RC jacks when this occurs.

    I personally have not read reports of people having this occur each day though I do recall reading a report of it happening once. Also, If you are running through an A/V receiver what is the model?
     
  18. snappingturtle

    snappingturtle Cool Member

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    Dec 19, 2007
    *Nod*. I saw it too. It was quite weird and those test patterns were really cool. I observed audio dropouts throughout the speaker test. Not quite sure what it was I was watching, I skipped back and played it again! :D
     
  19. snappingturtle

    snappingturtle Cool Member

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    Dec 19, 2007
    Hi Ron. From what I've observed, yes, they are present when watching from skip back and they are in the same positions in the video stream.
     
  20. phrelin

    phrelin Hall Of Fame DBSTalk Club

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    Jan 18, 2007
    Northern...
    Sorry, I missed this question somehow. I'm not a very good source for information on this as I watch nothing live - well, I did watch some Olympics live, but that doesn't count. So everything I see and don't hear is recorded on a 722.
     

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