Latency less with HR20 vs. Hughes DTivo. Why?

Discussion in 'DirecTV TiVo Powered PVRs & Receivers' started by guins, Sep 13, 2007.

  1. guins

    guins Networked DTiVo User

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    Watching a live football game on my Hughes DTivo and HR-20 I noticed that the HR-20 was about 2 seconds ahead of the DTivo. Was wondering why? Faster CPU?
     
  2. ebonovic

    ebonovic has gone his way...

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    Tinley...
    TiVo's write to hard drive first, then playback from the written material.

    HR20 plays back the live stream, and wirtes to the buffer 2nd (or more accurate, splits the signal internally and does both at the same time)...
     
  3. guins

    guins Networked DTiVo User

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    Interesting. Thanks!
     
  4. JimSpence

    JimSpence Just hangin'

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    Hmmm! Could this be why DLB isn't implemented on the HR20?
     
  5. HiDefGator

    HiDefGator New Member

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    Or an attempt to get around one or more patents.
     
  6. ebonovic

    ebonovic has gone his way...

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    Tinley...
    Or to keep in sync with non-dvr products playback...

    As if you are watching the same channel in another room, on a non-DVR... you can hear almost an echo effect.... that was a big problem for me, when I had the TiVo product...

    It was weird.. (both directions... could hear something early out of the other room, or get the echo effect).

    Now, it is nearly in perfect sync.
     
  7. TyroneShoes

    TyroneShoes HD evangelist

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    Interesting indeed.

    Which brings this question to mind:

    The intent of write/read for "live" was to allow trick play. IOW, that's how Tivo can jump back 8 seconds or pause "live" TV. How would a system that did not do a prior write/read accomplish that?
     
  8. stevel

    stevel Dumb Blond TCF Club

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    It just switches to the buffer when you hit pause. If the hardware is good enough, it can do so seamlessly.
     
  9. tfederov

    tfederov M GO BLUE!!!

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    I noticed that and actually have the same peeve that you did, Earl. Very interesting and cool stuff to know.
     
  10. HiDefGator

    HiDefGator New Member

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    And you imagine that engineers designed the dvr internals just so the video was in sync with non-dvr video, me thinks you give them too much credit.
     
  11. TonyD79

    TonyD79 Well-Known Member

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    Okay.

    First, Earl *talks* to people at DirecTV who tell him things.

    Second, it is not unusual. My cable DVR does the same thing for the same reason. The only difference is that when you switch from buffer to live and back, there is a momentary black screen. The HR20 keeps picture up and may have a bit of a still pause when switching to buffer (it doesn't seem to go back to full live without changing channels).
     

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