Setting of Clock seems off by 5-7 seconds

Discussion in 'TiVo Series3 HDTV DVRs' started by worachj, Apr 30, 2011.

  1. mattack

    mattack Well-Known Member

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    I guess you don't actually like to SEE the entire program you record.

    NBC programs actually seem to be flowing over _less_ than they used to, but for example, if you record the Thursday night comedies with no padding, you will MISS part of the last joke.

    Mythbusters typically runs over a fraction of a minute (and I pad all Discovery channel shows for the same reason). In fact, I pad almost every thing I can, unless I know there's a conflict (and I will then often "live with" missing a tiny bit in the middle)

    I oh so wish that Tivos would allow padding *on the same channel* to use the same tuner. That would essentially *double* the number of tuners for my purposes. (I would pay $$$ for this feature, even though I have lifetime subscriptions.)
     
  2. a68oliver

    a68oliver Member

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    Crawfordsvil...
    If you have ever watched two news people trying to carry on a conversation over a satellite link, you can understand how Tivo might clip the end of some recordings.

    An assumption.... The recordings are from cable and not OTA

    Imagine a cable network such as Discovery sends out their signal exactly at the listed broadcast time. Besides the delay caused by digital processing at various points in the broadcast chain, there is also a delay caused by the uplink to the satellite. Then there is a delay caused by the downlink. Unless the cable network starts the program early, there is no way you can receive it on time.

    Now another problem. I know Comcast used to, and I think still does, use a service called HITS (Headend In The Sky). They received many cable network channels in Denver and then repackaged them for use by their local franchises. So besides the uplink and downlink delays caused by the original network, there would now be an additional delay as HITS uplinks the sevice to the satellite and the local franchise downlinks it to their local headend.

    Add various digital delays in the local processing equipment as well as the local commercial insertion equipment and you have problems.

    Perhaps someone who is familiar with the way these uplinks and downlinks work can explain it better, and certainly more accurately, than I can. I don't have any inside knowledge but am simply repeating things I have heard.

    If the local cable company has recently changed the path the signal takes to get to your Tivo, this could explain the recently observed delays.

    YMMV
     
  3. JYoung

    JYoung Series 3

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    My cable company is actually 3-5 seconds behind OTA transmissions.

    I'd say it's the cable company.
     
  4. dwit

    dwit Active Member

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    I've got seasons and seasons of cooking shows saved from the food network. It is not at all uncommon for the shows to start from 3 to 10 seconds after the hour or half hour. In fact, it is not very common at all for these shows to start right on the hour. Almost always a few seconds late.

    Broadcast network shows typically start almost exactly on the hour or when scheduled(unless following a live show, etc.).

    My experience.(close to 10 TB worth of shows saved on Tivo's and PC's).
     
  5. Series3Sub

    Series3Sub Well-Known Member

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    Again, my TiVo clock is ON THE MONEY with USNO and all recordings are in their entirety with none of your problems. My vote if we are talking about this happening on the digital tiers only (or even analog as 68oliver's explaination is sound regarding head-ends in the sky), is that it is the data stream, probably a very long one. The delay not only occurs at the encoders and buffers there, but also in your box as it holds video in memory (buffer) until it gets the necessary data to spit out the content to your TV. From your perspective, it all looks smooth as silk, but it causes a delay in reaching your box and your TV screen, hence the programming starting late and overrunning into the next few seconds of the next hour. IN other words it all gets delayed a number of seconds. This is very common but will vary from cable co to cable co depending on how much they are putting in the stream. The more data, the longer; the less data, the shorter. Keep in mind a singal stream can have several channels in it, especially SD. Now multiply that by all the other streams that contain all the other channels and you get the idea. It could be only the channels on a particularly long stream and not other channel on other streams having this problem.
     
  6. worachj

    worachj Well-Known Member

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    In the past my recordings have been spot on since I purchased my S3 in 2006.

    In April, shows began recording 5-7 seconds earlier than they use to.

    Something has changed; the old way work perfectly for me.
     
  7. WorldBandRadio

    WorldBandRadio Active Member

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    I checked my TiVo last night against this site:

    nist.time.gov​

    and the red recording light turned on within one second of the NIST time.
     
  8. worachj

    worachj Well-Known Member

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    Yep, mine starts right on time also. That does not mean the clock and the time TiVo starts recording are in sync.

    Something changed, what use to work perfectly is not working now.

    ADDED EDIT:
    My S3 clock display used to be 5 seconds slow, but the recordings were mark on. Now the clock display is right on but my recordings start 5 seconds early. They have changed the syncing of the clock. I prefer the old way better. I don’t care if the clock display is right I want the recording correct.
     
  9. WorldBandRadio

    WorldBandRadio Active Member

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    When I checked it last night, the program was recorded starting at the point in time that the red light came on. I verified that by playing back the recorded program.

    I'm not sure what is the cause of the problem you are experiencing, but I do know that my TiVo's clock is sync'd within an accuracy of one second and the program is recorded properly.

    So I suspect the problem you are seeing may be one that is local to your TiVo or its environment. <shrug>
     
  10. daveak

    daveak Series 3 Novice

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    Are you sure something didn't change on the cable side to add a delay? If there is a noted delay on some cable systems vs OTA of just a couple seconds, is it possible your cable company has done something that increased or added a delay?
     
  11. paully65

    paully65 Member

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    Are you kidding me? Just add a minute on to the end of recordings. I mean, seriously.
     
  12. worachj

    worachj Well-Known Member

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    Thanks for all the input.

    What ever the reason for the difference it&#8217;s completely out of my control. Nothing I can say or do will change it back to the way it was. It&#8217;s just an irritant that I will adjust to.
     
  13. Phantom Gremlin

    Phantom Gremlin Active Member

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    Tualatin,...
    This topic comes up from time to time. Here is a recent post that shows you how to display the internal time on your TiVo.
     
  14. mattack

    mattack Well-Known Member

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    That's a *workaround* in many cases.. but it means you MISS the beginning of the next recording (if you have clipping turned on), or miss it entirely (if you have it turned off).

    and yes, I said above that I do have padding on virtually all shows.. but I "babysit" my To Do list a lot, because of issues like this. With enough tuners and recording space, it wouldn't matter.
     
  15. WorldBandRadio

    WorldBandRadio Active Member

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    That can (and usually does for me) result in overlaps.
     
  16. WorldBandRadio

    WorldBandRadio Active Member

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    One last comment here...

    I do notice that when I play back a show, the TiVo starts playing about 5 seconds or so into the show. If I want to make sure I see the very first few seconds of a show, I have to press rewind and let it go all the way back to the beginning of the recorded show.
     
  17. a68oliver

    a68oliver Member

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    Crawfordsvil...
    Depending on your setup, this effect can also be caused by your Tivo and TV resyncing if there was a change in picture resolutions. If you set the Tivo to output a fixed resolution instead of native resolution, this clipping may be reduced.
     
  18. GmanTiVo

    GmanTiVo give me more options

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    Mar 8, 2003
    Ridgewood, NJ
    I am experiencing the same on my S3 (FIOS), with a measured 12 to 15 second time shift (starts early, ends early).

    I have added 1 min. of recording time to shows I really like and watch as soon as they air like Survivor where there is an upcoming preview.

    I do find it annyoing but won't add 1 min to each season pass since I Tivo most series on channels like DiscoveryHD, ScienceHD, NatGeoHD, SciFyHD, Etc. which do show an upcomming 10 to 15 second upcoming preview.

    Just venting a lil since there is nothing I can do about it........ and I do blame FIOS for this.

    Gman
     

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