Going crazy with C51K/C61K audio dropouts

Discussion in 'DIRECTV General Discussion' started by SamS, Sep 18, 2016.

  1. SamS

    SamS Member

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    Dec 21, 2015
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    Well, that box pictured above is just a piece of hardware that sits between the C51K and the processor. Seems low chance of anything being too messed up, because if something goes screwy, you just remove that box from the HDMI chain, and I'm back where I started.
     
  2. ejbvt

    ejbvt AllStar

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    And this is the system they are pushing for 4K. Well, by pushing, I mean forcing.
     
  3. bmetelsky

    bmetelsky Cool Member

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    They are not forcing anything. You can choose to stay away from 4K service all together, if you'd like.
     
  4. compnurd

    compnurd Hall Of Fame

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    Or switch to cable and get 4K
     
  5. ejbvt

    ejbvt AllStar

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    That's not the point. Not even close. If you have 4K, you need a RECEIVER that outputs 4K. Not a buggy client.
     
  6. inkahauts

    inkahauts Well-Known Member

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    I have a feeling it wouldn't matter. I'd suggest this issue would be there weather it's a client by itself or a client and DVR server built into one box, which is what the genie is. (A genie is a client too itself after all, at least the way they have designed it) I think the issue probably has more to do with hvec decoding and such. If everyone recalls we had these kinds of issues with the hr20s for a while.

    To me it just shows how smart it was to not make full 4K genies till they worked out all these early bugs with this new decoder and such first in case changes need to be made IMHO.
     
  7. inkahauts

    inkahauts Well-Known Member

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    While I don't think this box is actually causing the issue the more stuff in between the more chance of an issue. And I really don't think you are on the right track to be honest. This box uses a different decoder and is most likely the firmware driving it over what you are looking at. Just my guess though I don't actually know. But based on similar issues with Hi Definition mpeg 4 roll out eons ago... it wouldn't be surprising.
     
  8. SamS

    SamS Member

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    Dec 21, 2015
    Texas
    No, the box (link here) was not causing the issue, I tried it last night to try and resolve the audio dropouts and black screen flashes.

    Good news - I think I'm onto something. The EDID settings on the AVProConnect AC-SC1-AUHD definitely help, and I think the original problem is 100% related to EDID between the C51K and my processor (aka A/V receiver).

    The AC-SC1-UHD EDID settings for 1080p did not help the dropouts at all. However, the setting(s) for 4K30Hz do solve the dropout issue, and pass through DD 5.1 from the C51K, as well as keep the native video resolution. Keep in mind, the AC-SC1-UHD is just sending EDID info back to the C51K to say "hey, I'm a TV that can accept 4K30Hz". And the C51K seems to like that better than 1080p EDID info. I'm not changing any resolutions with this AC-SC1-UHD, just the EDID. Interestingly, the 4K60Hz EDID options typically result in a loss of all audio.

    I tried this last night for about 1.5 hours on MNF via ESPN. I took some detailed notes on each EDID option, including if they caused dropouts or loss of audio and/or picture. I will keep testing, but initial results are very promising. I have not tried the same testing with the C61K, but I will eventually.

    Full disclosure - I won this AVProConnect AC-SC1-AUHD via a raffle drawing at CEDIA last week. I originally did not have any immediate use for it, but someone on another forum suggested that my original issue was EDID-related, so I figured "why not try".
     
  9. inkahauts

    inkahauts Well-Known Member

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    Just to be clear... there is no c51k. There is a c51 and it does not do 4K at all, only the c61k does so it really doesn't do anything with the info being reported the tv can do 4K. It's looking for if the tv can properly support 1080i and 720p. And even 1080p is only for some ppv so that is generally useless as well.
     
  10. SamS

    SamS Member

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    Dec 21, 2015
    Texas
    Ah yes, I have inadvertently referenced the C51 as having a "K" designation, which I now understand is incorrect.

    If you hook a C51 up to a 4K TV, the TV exchanges EDID information with the C51. Part of the information that the TV sends includes the fact that it supports 4K (just like what my little box is doing). Yes, the C51 ignores that, or makes some kind of EDID adjustment. But the fact remains, whenever I hook a C51 (and C61K - but that's another story) to either my Denon 1080p processor or the AC-SC1-UHD with a 1080p EDID, it causes the C51 to glitch. Move it to a 4K AVR, or the AC-SC1-UHD with 4K EDID, and the dropout/glitch is gone.
     
  11. employee3

    employee3 Legend

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    SamS, that makes sense because I NEVER get dropouts while watching 4k content. Only when watching 1080i (the majority of what's available and what I watch)... so it seems that the C61k doesn't not handle 1080i/p EDID correctly for whatever reason. Not sure why that would effect content "in flight" rather than cause some issue in the beginning of the handshake but maybe that's what DirecTV is trying to figure out.

    Do you know if EDID info is continuously "refreshed" or periodically "refreshed" between devices?
     
  12. SamS

    SamS Member

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    Dec 21, 2015
    Texas
    From what I understand, EDID info/handshake/refresh can reoccur if there is a change in video, or audio formats. This doesn't exactly describe what is happening in the middle of a football game and you get a dropout :) So, what I think might be happening is the C51/C61K may have some kind of buffer overrun which either corrupts or overloads the bus that transmits EDID in the C51/C61K. This causes errors with some receiving HDMI receivers (again, not AVRs, I'm talking about the Silicon Image HDMI receiver inside your AVR). Those errors cause the dropout(s). The auxiliary EDID device from AVProConnect that I have must do a better job handling the errors that the C51/C61K is transmitting, or by forcing the EDID back to the C51/C61K it negates the errors being transmitted.

    Much of the above is conjecture based on my testing and limited knowledge. But it is the only reasonable conclusion I can draw based on hours of testing.
     
  13. employee3

    employee3 Legend

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    Aug 15, 2006
    Just to put another wrinkle into the mix... I fixed the audio dropouts issue for me. My setup is a C61k directly connected to a Vizio P65-C1 with the HDR firmware.

    What I found is that if I turned OFF the HDMI Color Subsampling for the input where I have the C61k connected - no more dropouts. This has to do with enabling HDR on the port from my understanding but this could explain why some people with that combination were not hearing dropouts while some were. I think I previously had my UHD bluray player on that port and that's why I had it turned on.
     
  14. SamS

    SamS Member

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    Dec 21, 2015
    Texas
    Very interesting, and good tip for others.
     
    1 person likes this.
  15. goblazers_6

    goblazers_6 AllStar

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    I've had two customers in the last 24 hours reporting random audio dropouts lasting 1-5 seconds. Both have c61k clients connected with HDMI to Samsung UN65KS9500F Curved UHD TV sets. One customer was using the ARC on HDMI from the TV to a Samsung soundbar, I recommended he try an Optical cable, and he confirmed today the issue still exists. The second customer is using a Denon receiver and has tried optical from the IRD to receiver and from the TV to the receiver. I wasn't able to find anything in the cadie regarding audio issues with the c61.

    Any thoughts? Software related somehow?
     
  16. peds48

    peds48 Genius.

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    Known issue for an long time which DIRECTV has not been able to address.


    Sent from my iPhone using Tapatalk
     
  17. compnurd

    compnurd Hall Of Fame

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    This seems to be pronounced with people using a soundbar or AVR
     
  18. goblazers_6

    goblazers_6 AllStar

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    Any link to any official statement? So I assume customers are just being told to wait for a software update?
     
  19. MysteryMan

    MysteryMan Well-Known Member DBSTalk Club

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    Here's the official pacifier......"Greetings......Thank you for your patience as we continue to find a resolution to this issue. Any updates regarding this issue will be sent to you via email immediately. We will update you as we continue to investigate this issue. We appreciate your support regarding this matter......Thank you for choosing DIRECTV".
     
  20. mark_winn

    mark_winn Legend

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    Yes, I am still dealing with this same issue on my UN55JS8500. It also is connected to a Samsung sound bar. This is very frustrating !


    Sent from my iPad using DBSTalk
     

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