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change season pass from hd to sd

Discussion in 'TiVo Premiere DVRs' started by bobdole888, Jan 25, 2013.

  1. jrtroo

    jrtroo Chill- its just TV

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    I use a wishlist for this scenario. Works great.
     
  2. L David Matheny

    L David Matheny Active Member

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    Yes, this is a huge PITA, and it's surely lazy programming on TiVo's part. How hard could it be to simply allow changing the season pass channel number to any channel in the current lineup? And what's the worst that could happen if they allowed that? I guess you could choose a channel on which that program will never appear, but so what? If you make that mistake, you just suffer the consequences. Anything would be better than the never-ending pain of having to continually watch for a program to reappear just so you can fix the season pass.
     
  3. Jonathan_S

    Jonathan_S Well-Known Member

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    Didn't that get partially mitigated by the web based season pass transfer feature?

    I seem to remember the website recognizing when there were both an SD and HD version of a channel (in your new TiVo's lineup) and (usually?) asking which one I wanted to SP set for. I don't think there had to be an upcoming episode, but it's been a while so I might be somewhat misremembering.
     
  4. lpwcomp

    lpwcomp Well-Known Member

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    John's...
    I think part of the problem here is there are two different things being discussed. The HDUI allows you to select the channel when you create a season pass but you still cannot modify the channel for an existing season pass.
     
  5. OvrrDrive

    OvrrDrive New Member

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    I just used it to transfer my SP's from my old box to my premiere and every SP I selected it asked me what channel I wanted to record from before it imported them. It was amazing simple to change my old sd channels to the hd's using it.
     
  6. mattack

    mattack Active Member

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    "you could choose a channel on which that program will never appear, but so what"

    So what? So then Tivo gets lots of calls from people because of *their* (the user) fault.

    You seem to be missing the "simplicity" part of Tivo.

    YES, *I* would like more tweakability, but the "UI is consistent" (though less consistent than with a S1) and "it just works" are hallmarks of it and other good UIs.
     
  7. lpwcomp

    lpwcomp Well-Known Member

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    John's...
    I agree wholeheartedly with this. However, they could offer the same channel selection options you get when you initially create an SP, assuming there were any upcoming episodes. HDUI only of course.
     
  8. h2oskierc

    h2oskierc I'm a 2-Tuner

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    Not to digress, but isn't this last bit what a wish-list search is for?
     
  9. HerronScott

    HerronScott Well-Known Member

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    The 720p programs take up less space on my TiVo's versus the 1080i. why do you think they would be the same size?

    Scott
     
  10. JoeKustra

    JoeKustra Cable only TCF Club

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    What make you think they are different? :D
     
  11. Rob Helmerichs

    Rob Helmerichs I am Groot! TCF Club

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    Mathematically, a 720p image should be 11% smaller than a 1080i. I don't know how much of an impact various compression schemes can have, but I wouldn't be surprised if that were a bigger factor than 720p vs 1080i in final file size...

    The reason those two formats were chosen for HD broadcast standards is because they're pretty much the same bandwidth...with different quality trade-offs to get there.
     
  12. HerronScott

    HerronScott Well-Known Member

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    Hi Rob,

    How are you calculating 11% smaller? A single frame of 1080i (1920x1080) has 2,073,600 pixels while a single frame of 720p (1280x720) has 921,600 pixel per frame. That's over twice as large uncompressed.

    Of course cable feeds are compressed (and more so than OTA). On my local Comcast channels, Fox and ABC 1 hour shows at 720p are 2.5-3.5GB on the TiVo while 1 hour shows on the other 1080i stations are 4.5-5.5GB depending on the channel.

    I had not looked at file sizes in some time and I see that Comcast is doing even more compression than they use to as I seem to recall the 1080i stations being over 6GB in size for an hour shown in the past.

    Scott
     
  13. Rob Helmerichs

    Rob Helmerichs I am Groot! TCF Club

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    No, a single frame of 1080i only has half of the image (that's where the "i" comes in...interlacing alternate frames to get the whole image).
     
  14. HerronScott

    HerronScott Well-Known Member

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    My understanding is that for interlaced standards, the field rate and frame rate are different. In order to achieve the same same final 30fps *frame* rate with an interlaced standard, the field rate is double so 60 fields per second. Each field as you mentioned is half the full frame (540 lines) for interlaced. For progressive standards, the field rate and frame rate are the same.

    Even given the varying compression the cable companies apply, you can still see this by the 1.5 to 2 times file sizes of 1080i content versus 720p content.

    Scott
     
  15. JoeKustra

    JoeKustra Cable only TCF Club

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    Ashland, PA...
    I would like to thank you all for the education. I felt, using TiVo Desktop, that resolution and content were important considerations for file size. The OP wanted to save space and, like my cable feed, has the option of the same network in SD and HD. I don't use my TiVo for storage and offload anything I want to save. I appreciate your math and logic that convinces me that all storage is not the same. I also saw this with the CM-7400, TViX and my Sony DHG. Have a nice day.
     
  16. L David Matheny

    L David Matheny Active Member

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    I can't contribute any expert knowledge to this discussion, but my understanding has been the same as Rob's is (apparently), which is that for progressive scan the frame rate is the full 60 frames per second. If that isn't the case, surely 1080p60 could be transmitted over-the-air and a TiVo could record it. Neither is possible because 1080p60 would require twice as much bandwidth as 1080i60. I've read that, and it makes sense. If H.264/AVC is used then 1080p60 broadcasting could be done because H.264 compresses better than MPEG-2 by about 2 to 1, but most TV receivers in the field today can't handle H.264. Am I wrong about all of this? (Stranger things have happened.)
     
  17. Rob Helmerichs

    Rob Helmerichs I am Groot! TCF Club

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    Minneapolis
    I'm no expert, so if my understanding of 720p vs. 1080i is faulty or incomplete, I'd love to be educated.
     
  18. Arcady

    Arcady Stargate Fan

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    Progressive scan and frames per second are not tied to each other. You can have 1080p24 1080p50, or 1080p60.

    The ATSC standard actually allows for H.264 1080p50 and 1080p60, but nobody uses it because receivers only work with MPEG-2. Thus you get the chicken and the egg problem, since no broadcaster will upgrade to H.264 when nobody can receive it, and nobody will make a receiver that can receive H.26 when nobody is broadcasting it.

    You're stuck with 720p60 or 1080i60 on the majority of broadcasts in the US, at least until the next round of updates, probably to 2160p.
     

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