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Jerky Playback

Discussion in 'TiVo Home Media Features & TiVoToGo' started by Soapm, Sep 21, 2012.

  1. unitron

    unitron Active Member

    16,387
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    Apr 28, 2006
    semi-coastal NC
    You have to remember, he didn't time machine his TiVo back to 1957 to pick up a broadcast from the local CBS affiliate*, so who knows what kinds of electronic cuisinarts that video's been put through.


    *Wouldn't you LOVE to be able to do that?
     
  2. txporter

    txporter One sec, almost done

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    Sep 17, 2006
    Austin, TX
    Yes, I totally agree with you. Anything could have been done to the video to get it into its current state.

    And I just noted your comment in the earlier reply about FILM rate. You are totally correct that FILM rate is 24 fps, and it is dropped to 23.976fps by dropping every 1000th (or 1001st?) frame to make the 3:2 telecining process to 29.97fps easier.
     
  3. unitron

    unitron Active Member

    16,387
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    Apr 28, 2006
    semi-coastal NC
    So what did you do with the

    + 1TB WD10EVCS Antec MX-1

    ???
     
  4. txporter

    txporter One sec, almost done

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    Sep 17, 2006
    Austin, TX
    Re-purposed. I had two power supplies die on my TivoHD that had the external drive attached to it. When I move to the 2TB Premiere as my main machine, I dropped my TivoHD back to 1TB. It is just my backup Tivo now.
     
  5. Soapm

    Soapm Active Member

    1,564
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    May 9, 2007
    So close,...
    Trying it now and will report back.
     
  6. Soapm

    Soapm Active Member

    1,564
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    May 9, 2007
    So close,...
    Still looks great though I have to admit with my old eyes I really don't see a difference between vfr and cfr. Perhaps the Tivo mask the difference or I don't know what to look for.
     
  7. ggieseke

    ggieseke Active Member

    4,028
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    May 30, 2008
    A REALLY good antenna and about 330 trillion miles worth of RG-6 coax should do the trick. :D
     
  8. txporter

    txporter One sec, almost done

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    Sep 17, 2006
    Austin, TX
    Do you have a copy of both output files still? If you download a copy of MediaInfo, you can analyze the files and see the framerate differences. The main difference between the mp4 transcode with --vfr vs --cfr is that the --vfr transcode will have variable framerate with an average fps of ~24. The --cfr transcode will have a constant framerate of 29.97fps. I was just wondering if that addressed the playback issues that you noted on your TivoHD. TivoHD show some odd playback issues with H.264/MP4 files with framerates at or below 24-25 fps.

    Ideally, the --vfr transcode from Handbrake should have the original progressive frames while the --cfr transcode will likely have the original progressive frames plus some duplicate frames in order to make up the delta between the original frame count and the called for framerate (~24 frames vs ~30 frames asked for). If you are sensitive to judder (this is caused by the presence of duplicate frames in the playback stream), then you would probably find the --cfr transcode less pleasing to view. If the problem is the TivoHD playback abnormalities, then you might find the --cfr transcode looks better when viewing.
     
  9. dlfl

    dlfl Cranky old novice

    6,997
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    Jul 6, 2006
    Near...
    Yeah, but that's assuming the antenna and cable end are 57 light years away. Then you have to wait (more than) another 57 years from now for the antenna signal to come down the coax. For that reason this scheme is totally impractical.

    The practical scheme that would allow instant viewing is to have deployed a 165 trillion mile long cable and antenna, 28.5 years ago. Then the signal would be reaching earth right now.

    There are a few other practical issues but surely we can hire some scientists from China or India to work them out. :rolleyes:
     
  10. lrhorer

    lrhorer Active Member

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    Aug 31, 2003
    San...
    'No need for time travel or 30 lightyear long CATV cables with billions of amplifiers to overcome the huge attenuation involved, or the totally ludicrous notion of building a time machine. The solution is quite trivial. Just build a parabolic radio dish with a radius about 4 times that of the Earth and use it to recover the signals reflected from the debris ring around Formalhaut, silly boy.
     
  11. Soapm

    Soapm Active Member

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    May 9, 2007
    So close,...
    Actually I went with a more practical solution, I moved the date back on the Tivo but still waiting for the guide to update...
     
  12. Soapm

    Soapm Active Member

    1,564
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    May 9, 2007
    So close,...
    I'm cool with the first changes you suggested and have been redoing all the episodes. Both looked better then it did before so I appreciate all the help.

    I will keep these lessons in my notes in case I run into a situation where they might help. I love old shows...
     
  13. unitron

    unitron Active Member

    16,387
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    Apr 28, 2006
    semi-coastal NC
    In that case, see if you can catch some old Milton Berle show episodes as well, or maybe something from the DuMont network.
     
  14. Soapm

    Soapm Active Member

    1,564
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    May 9, 2007
    So close,...
    I put them in my wish list and been forcing my Tivo to connect for the last couple of hours. I'll put them up as soon as the guide data updates.... :up:;)
     
  15. unitron

    unitron Active Member

    16,387
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    Apr 28, 2006
    semi-coastal NC
    If you see the Kennedy-Nixon debate listed you didn't set the clock back far enough.

    If you see Nixon's Checkers speech listed, it's too far back, but you might catch the debut of I Love Lucy.
     

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