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D* already at 5 channels per transponder on 2 transponders of 103b!!!

Discussion in 'DIRECTV Programming' started by vurbano, Oct 18, 2007.

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  1. Alan Gordon

    Alan Gordon Chancellor

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    That goes against everything DirecTV has said in the past... well, the QPSK part anyway (not sure about the DVB-S2).

    DirecTV said they were switching over to 8PSK back when they first announced they were going to start broadcasting HD channels in MPEG4... and has been mentioned several times in the past.

    ~Alan
     
  2. Ken_F

    Ken_F Godfather/Supporter DBSTalk Gold Club

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    Perhaps it is temporary. Only a DirecTV insider can answer that.

    DirecTV does use DVB-S2 with 8PSK for the spots. Of course, spot beams are much tighter than CONUS beams.
     
  3. ActiveHDdave

    ActiveHDdave Godfather

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    I thought the stinken channels looked great but then I saw a fly crawling across the the TV screen and that ticked me off. When is D* going to get it right?.:rolleyes: :nono2: :beatdeadhorse: :soapbox:
     
  4. jtn

    jtn Banned User

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    with my equipment. I'm getting actually 6 satellites : 101, 110, 119, 99b, 103a, & 103b! With the latest update 0x18a the HD picture is fantastic and consistent on all channels. I'm getting 100% on many transponders but no less than 94% on all satellites on any transponder. I have the AT-9 dish. Initially when the technician came to install it, he had forgotten to charge the batteries on the meter, so it was not tweaked. I had to go and tweak the dish myself.

    Sorry to hear your having problems, but it seems to be related either to the market your in, or the tweaking of your satellite dish, whether it be the AT-9 or Slimline.
     
  5. vurbano

    vurbano Godfather

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    My HD DVD player has much better PQ. I suggest you return yours.
     
  6. Milominderbinder2

    Milominderbinder2 Cutting Edge: ECHELON '08

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    So are we saying that both DISH and DIRECTV have nearly 40Mbps usuable per transponder?

    If you divide that into 5 channels, you get about 8 Mbps per channel?

    Isn't 8 Mbps seen as the magic number for best picture quality?

    Some content providers such as MGM and Smithsonian are giving us great HD 24x7. Others have dumbed their pictures down to 1440 width or less. Others are claiming upconverted and stretched SD is HD.

    Why aren't we contacting the content providers if they are not providing a good source?

    DIRECTV is certainly capable of delivering good quality if the content providers do as well. I think it is garbage in, garbage out (GIGO).

    Speaking of GIGO, if I wanted gossip, I would be at another forum.

    - Craig
     
  7. jtn

    jtn Banned User

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    Depending on when the programming your watching was produced (the year it was made) and the technology used, will factor on the quality of the programming. Programming produced after 2003 is superior to programming produced earlier if intended for HDTV, and again it varies on the cameras used, and many other variables.
     
  8. Tom Robertson

    Tom Robertson Lifetime Achiever DBSTalk Club

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    And real film can be scanned and compresses very nicely. :)
     
  9. jtn

    jtn Banned User

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    I have seen many older films with great quality picture on HD channels. Many older films were recorded in Panavision in widescreen since films have been around.
     
  10. Ken_F

    Ken_F Godfather/Supporter DBSTalk Gold Club

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    That doesn't include overhead.

    DirecTV is evidently using a ~38 Mbps mux. Dish Network uses ~41 Mbps.

    That really depends on content type.

    Film-sourced 1440x1080i material should do very well with MPEG-4 @ 8Mbps. Video sourced material (live sports, concerts, etc) will present more of a problem, especially if there is a lot of motion involved.
     
  11. Tom Robertson

    Tom Robertson Lifetime Achiever DBSTalk Club

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    Can the muxes be programmed for difference bitrates or is that usually fixed?
     
  12. inkahauts

    inkahauts Well-Known Member

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    Ok, probably a dumb question, but can anyone tell me for sure what the bit rate was of the HD MPEG-4 channels on the day they were turned on? Has it changed, because the PQ doesn't seem any different. And also, which channels have changed and are now using a lower bit rate? I'll pay closer attention to those channels....
     
  13. Ken_F

    Ken_F Godfather/Supporter DBSTalk Gold Club

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    The total mux rate can be set to whatever DirecTV wants, but it must obviously be less than what they have available to use, after accounting for DVB-S2 overhead.

    If you're asking whether those bits are evenly divided between all channels, then the answer is most certainly not. DirecTV uses statistical multiplexing so the bandwidth varies on every channel every second. The more bits a channel needs, the more it gets relative to the others; the less bits a channel needs, the less it gets relative to the others. DirecTV can also prioritize specific channels over others; I would certainly expect them to give higher priority to the most popular channels.
     
  14. Ken_F

    Ken_F Godfather/Supporter DBSTalk Gold Club

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    Remember, just because a channel is launched on a certain day doesn't mean it was uplinked that day. It just means you were given access to it on that day.
     
  15. apexmi

    apexmi Godfather

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    Seems to me some people are WAY more concerned with numbers than looking at any actual PQ.:( Kind of sad really, as I think they would find a problem with full bandwidth at full 1920 x 1080. That's one of the reasons why I left the blu-ray HD-dvd forums over at AVS all the talk is specs. instead of content.
     
  16. Tom Robertson

    Tom Robertson Lifetime Achiever DBSTalk Club

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    Apexmi, we have threads where people talk about PQ too. One per groups of new channels. :)

    Yeah, real PQ should be the real discussion. For instance, a channel that really, really puts multi-pass compression to work, spending upwards of a couple days of processing against a 2 hour show (really working the look ahead bits in MPEG4), can have an AWESOME PQ and a fairly low bitrate!

    Cheers,
    Tom
     
  17. apexmi

    apexmi Godfather

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    Yeah I know Tom, It just gets to me sometimes like the guys that can hear the difference between a $20 audio cable and a $300 one... :)
     
  18. phat78boy

    phat78boy Hall Of Fame

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    Agree with you apexmi. All about how good it looks. You could have any bit rate you wanted and if your decoder was crap it would still look like crap.
     
  19. Tom Robertson

    Tom Robertson Lifetime Achiever DBSTalk Club

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    "But I can hear the difference between a $2 digital audio cable and that $300 digital audio cable, plugged in my tube amplifier..." :)

    Cheers,
    Tom
     
  20. apexmi

    apexmi Godfather

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    You know it. :lol:
     
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