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Timeline Malfunction

Discussion in 'DIRECTV HD DVR/Receiver Discussion' started by frapnitz, Aug 22, 2014.

  1. frapnitz

    frapnitz Cool Member

    Nov 20, 2008
    One of my HR-24s has recently taken to recording (both manual and non-manual) and showing the time bar properly. But, when playing it jumps immediately to the end and asks if you want to delete. If you indicate no, and then go back to the beginning (0:00) and then use the re-wind button, it will contnue to re-wind to the actual beginning of the show. In the case of the Today show, that is 4 hours. It wil fast forward and "skip" as it normally does whle all the while remaining on the 0:00 marker.

    This does not happen on "all" recordings (so far).

    Anyone else seen this happen? Thanx.
  2. litzdog911

    litzdog911 Well-Known Member

    Jun 23, 2004
    Mill Creek, WA
    It's not happening on my HR24. Have you tried resetting the DVR?
  3. SomeRandomIdiot

    SomeRandomIdiot Godfather

    Jan 6, 2009
    I have had the status bar stick multiple times and do other strange things - once I had it stick on the same show for over 18 hours. Was not on a HR24 though, but a HR20 iirc.
  4. frapnitz

    frapnitz Cool Member

    Nov 20, 2008
    Yes, I pulled the power cord and made it brain dead and that solved the problem for a while and I was disappointed when it did the same thing a few days ago.
  5. Rich

    Rich DBSTalk Club DBSTalk Club

    Feb 22, 2007
    Piscataway, NJ
    Is that a 24-500?

  6. TomCat

    TomCat Broadcast Engineer

    Aug 31, 2002
    I had a HR20 that was once reporting 963 hours in the time bar.

    The time bar is based on the Presentation Time Stamp which lives in packet headers, and is analogous to timecode in analog video. But there is really no redundancy or forward error correction for that, other than it repeats in, IIRC, every 10 packets or so. So if it gets corrupted enough (enough of them damaged in a row) the DVR can get confused about just where it is in the world, often defaultiing to 00:00:00. Sometimes you can fast-forward past one of those blips; other times you can't. If the PST is good again 30 seconds down the recording, you might be able to "jump" over it, as the jump feature looks for a PST that is 30 seconds (nearest I-frame to 30, actually) greater than the present PST, and sends the playback there non-linearly like on a DVD, which is how the jump can be instantaneous.

    So what is important here is that the video has redundancy in FEC, but the PST does not, which means that if your signal is marginal, there may be corrupted video packets that get fixed by FEC, while PST does not have that option. That means that the video may look fine, but the PST might be corrupted enough to cause this issue, on rare occasion. It does seem unusual that it might be tied to a up rev, though, so maybe something else is causing this for a different reason other than marginal reception. But it would not hurt to verify that.

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