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No difference between Native On/Off and 480, 720, 1080...

Discussion in 'DIRECTV HD DVR/Receiver Discussion' started by CHaynes112, Dec 7, 2009.

  1. sptrout

    sptrout AllStar

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    Dec 29, 2006
    Spring, TX
    Thanks veryoldschool. I had not heard of the 480i HDMI issue before. Since that is not an issue with my TV, no reason for 480P, but I guess 480i is still an option. However, since we almost never watch SD shows, I see know reason to have it selected if it slows-down the resolution selection process when changing channels. Does it slow it down (one more resolution to check)?
     
  2. veryoldschool

    veryoldschool Lifetime Achiever Staff Member Super Moderator DBSTalk Club

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    Dec 9, 2006
    I use it since my TV does a better job scaling than the receiver(s). [personal choice]
    The simplest way is to try it for a while. If it takes too long for you then turn it back off and you'll have "your answer".
     
  3. rudeney

    rudeney Hall Of Fame

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    Another purpose for 480p is when the receiver is connected to an EDTV and that's its native (and highest) resolution supported.
     
  4. TomCat

    TomCat Broadcast Engineer

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    Aug 31, 2002
    I don't think that is the case. The issue with having more than one resolution is that TV actually comes in more than one resolution, and I think only when you switch from a channel with one to a channel with a different one will that slow down the HDMI handshake/rescaler/deinterlacer process. If the resolution is fixed, and thus always the same, I think this can speed up the HDMI handshake/rescaler/deinterlacer process, which is the primary argument against "native on". But I have never put the stopwatch to it to prove that theory.

    I don't think it has to "check" resolutions serially. If that were true, and if your HDTV could talk, it might be saying something on the order of ("Let me try this one. No, no good. OK, now let me try that one."), I think the process is more like "I saw a brief glitch (due to a non-synchronous channel change) but the signal came back quickly and is a) still the same format so I do not have to blank the screen longer while changing formats, or b) a different format, so I will have to blank the screen longer to accommodate changing formats." IOW, more than two formats should not slow the process down. Two can slow the process when changing between them as compared to being fixed to one format, but having more than two checked should not slow it down even more. Those checked that are not the resolution you are switching from or to are not in play, anyway.

    If you change resolutions on your computer connected to a multi-sync monitor, it takes a second or two to adjust. This is similar to the process when you change from a 1080i channel to a 720p channel or vice versa, and can be aggravated by using HDMI.
     
  5. TANK

    TANK Icon DBSTalk Club

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    Feb 16, 2003
    FLORIDA

    Since your plasma is 1080p , is the plasma upconverting everything from the hd dvr ( no matter what resolution 480i,480p,720p or 1080i ) to 1080p ?
     
  6. CHaynes112

    CHaynes112 AllStar

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    Dec 2, 2009
    Yes. This is why I really couldn't see any difference. However, when I 'forced' an HD program in 1080i to be converted to 480i first (from the DVR) then let the TV convert to 1080p, I could see a difference (as it was going from 1080i to 480i to 1080p, instead of directly from 1080i to 1080p). This proves that everything is working like it should. I still can't really see any major differences with Native On vs. Native Off (with all 4 resolutions selected), except maybe with some of the SD locals. Either way I have chosen to set Native on as it will give slightly better quality on SD locals, provide me with the resolution LED on front of the DVR, and eliminate any DVR conversions.
     
  7. rudeney

    rudeney Hall Of Fame

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    I think most people see little if any difference between native on or off, except for one thing, which deals with interlacing. If you have a 1080p set, 1080i broadcasts will look better when natively displayed as the only conversion taking place is de-interlacing of the image. However, you wouldn't want to set your receiver to "force" only 1080i output because when watching sports or other fast-motion programming on a 720p native broadcast, having them interlaced can cause some undesirable "artifacts" in the image.
     

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