Busted! Comcast Down-Converts native 1080i Channels to 720P!!!

Discussion in 'TiVo Coffee House - TiVo Discussion' started by HarperVision, Jul 29, 2016.

  1. Nov 18, 2017 #801 of 1034
    Heinrich

    Heinrich Member

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    It's also very noticeable on very dark shows - something like Twin Peaks Season 3. With the dark backgrounds, night scenes, the compression was so obvious and ugly that it completely ruined scenes.
     
  2. Nov 18, 2017 #802 of 1034
    slowbiscuit

    slowbiscuit FUBAR

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    Yep with no comskip etc. IPTV is going to suck, massively, and Tivo folks are going to wish that we had full control back. Just a matter of time now until we lose it all.
     
  3. Nov 18, 2017 #803 of 1034
    murgatroyd

    murgatroyd Don't stop believin'

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    Late to the party, but does anyone get The Olympic Channel? Here we are in the run-up to the Olympics, and I'm getting tons of motion blur/smearing. I hate Comcast and NBC so much right now.

    Where can you find out the native resolution of the different channels? What can I look for, numbers-wise, as a sign that they're downconverting the signal?
     
  4. Nov 18, 2017 #804 of 1034
    JoeKustra

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    The resolution of the incoming channel is displayed with the Info button. It's on the right. System Information for a channel displays MPEG-2 or H.264. Audio of AC3 is Dolby (2.0 or 5.1 or DD EX).
     
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  5. Nov 18, 2017 #805 of 1034
    murgatroyd

    murgatroyd Don't stop believin'

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    Thanks, Joe! The trouble with all this stuff -- I learn it, I understand it, and then I forget it because I don't use the info all the time.

    For example -- somehow it got stuck in my head that my TV only does 720p. I wasn't following this thread because I thought it didn't matter to me. Now I'm trying to figure out where I saw that.

    Specs - LED TV UN22F5000AF | Samsung TVs
    Samsung UNF5000 Specs

    Anyway, checking with the info button, the Roamio says The Olympic channel is 720p. Wikipedia says it's supposed to be 1080i.

    Olympic Channel - Wikipedia

    Just checked to see what the Roamio was sending to the TV and it's set to adjust automatically.
     
    Last edited: Nov 18, 2017
  6. Nov 18, 2017 #806 of 1034
    JoeKustra

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    The new (to Roamio) Choose Video Resolutions menu is funny. The first entry of "Auto" also has a panel to the right showing you what "Auto" means. Mine says 1080i and probably most 1080p TVs say that. Notice there is a (preferred) after 1080i (or 720p for some smaller sets). My TV supports 1080p, but I set my TiVo to output 1080i and 1080p 24/25fps for (pass-through), which is streaming only.

    I don't get the Olympic Channel on my feed. I also see it's not offered on my Roku 3, but I can get NBC Sports.

    I bought an LG 24LF4820 for my kitchen/Mini since it supports 1080p. No DD 5.1 though.
     
  7. Nov 18, 2017 #807 of 1034
    Bigg

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    Hulu is offline encoded for streaming, so you can't compare to that. Compare to your local OTA affiliate, it's usually exactly the same, although an affiliate could send a different mux to Comcast via fiber than they use OTA if they really wanted to. It also depends on the market and how many subchannels they have, so they likely look lousy via OTA in your market as well.

    I don't know about Portland, but if you are in Boston, then you've got some weird stuff going on, as there are a couple of channels that have two HD channels on one transmitter, plus some subchannels, I believe NBC Boston is still sharing with Telemundo because they had to find somewhere to put it. The Boston market is very strange. That all has nothing to do with Comcast, they just pass the garbage on without further re-processing. WMUR-DT is also broadcasting in 1080i, which is even weirder, not sure about the ABC in Boston proper?

    It's going to get weird when Tokyo comes around, and NBC is sending DirecTV a 2160p feed at a very high bitrate via satellite that is downrezzed from the master 4320p Super Hi-Vision feed, and Comcast is limited to 720p with ridiculous compression.

    ABC and FOX owned channels, plus History Channel are 720p.
    CBS, NBC, Viacom, Scripps, and Discovery owned channels are 1080i

    That should cover about 90% of the major channels out there. PBS is usually 1080i AFAIK.
     
  8. Nov 18, 2017 #808 of 1034
    kbmb

    kbmb Well-Known Member

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    Thanks for the info. Well whatever Hulu is doing....they are doing it right :D We watch all our ABC and FOX from Hulu just so we get a nice clear picture. I'd love to get CBS On Demand via Hulu, but it seems you have to subscribe to their TV package to get it. We almost NEVER watch anything live....except Game of Thrones ;)

    NBC Boston is kind of a mess still. Audio is STILL being sent incorrectly - all center dialogue goes through my front speakers. Thankfully, we don't really watch any NBC shows right now. WCVB is the ABC affiliate out of Boston, they are 1080i as well. We get the benefit of both WCVB and WMUR here in NH.
     
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  9. Nov 18, 2017 #809 of 1034
    murgatroyd

    murgatroyd Don't stop believin'

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    In the right panel, it says:

    "Auto for your TV includes 1080i"

    I'm seeing 720p for all the sports channels -- the local NBCSports channels and for ESPN/ESPN2, SEC channel, the works.

    I can play with the different settings, but I don't want to do it now because I'm in the middle of recording something.

    Thanks again for your help.
     
  10. Nov 18, 2017 #810 of 1034
    laria

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    :confused:

    I am watching an NBC Boston show right now and the audio seems fine. The dialogue is coming through our center channel.
     
  11. Nov 18, 2017 #811 of 1034
    kbmb

    kbmb Well-Known Member

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    Wonder if it’s on the newscasts mostly. Seems that’s the only time I end up on NBC.
     
  12. Nov 18, 2017 #812 of 1034
    NorthAlabama

    NorthAlabama tabasco rules

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    i happens with certain live broadcasts, too, i've noticed. when it happens, i adjust my audio settings to pcm, as it's annoying.
     
  13. Nov 18, 2017 #813 of 1034
    laria

    laria Librocubicularist

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    Ah, I don’t watch the news, too depressing
     
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  14. Nov 19, 2017 #814 of 1034
    JoeKustra

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    Be like most of the country, get your news from The Daily Show. :cool:
     
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  15. Nov 19, 2017 #815 of 1034
    Bigg

    Bigg Cord Cutter

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    Yeah, they have a huge advantage in being able to encode off-line to get a really good picture.

    And both weirdly are in 1080i, unlike almost every other ABC affiliate in the country, while NBC Boston is a bit-starved mess. You guys really have some weirdness up there. Love the Lakes Region though.
     
  16. Nov 19, 2017 #816 of 1034
    JoeKustra

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    FYI:
    WCVB is one of a handful of ABC-affiliated stations and one of several Hearst-owned ABC affiliates that broadcast their high-definition signals in 1080i rather than the 720p format of most other ABC stations. This includes WCVB's ABC-affiliated sister stations WMUR-TV in nearby Manchester, New Hampshire, WTAE-TV in Pittsburgh, KMBC-TV in Kansas City, and KETV in Omaha, as well as stations not owned by Hearst in eight other markets.

    From Wiki.
     
  17. Nov 19, 2017 #817 of 1034
    leswar

    leswar leswar

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    Also broadcasting in 1080i is WPBF 25 in West Palm Beach, FL.
     
  18. Nov 19, 2017 #818 of 1034
    JoeKustra

    JoeKustra in the other Alabama TCF Club

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    While it is a Hearst station, Wiki disagrees with you on the 1080i -> WPBF - Wikipedia Maybe you can fix it.
     
  19. Nov 19, 2017 #819 of 1034
    NashGuy

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    I read somewhere (not on a message board, but in a real article intended for the broadcast industry) that most cable companies get their local affiliate feeds via fiber now, not OTA. I'd bet that's true, at least with Comcast.

    I'll be shocked if, by 2020, Comcast isn't offering a 2160p HDR linear feed of the Tokyo Olympics via IPTV. They've already begun deploying STBs that can handle such. Given that Comcast owns NBC, I really don't think they're going to let AT&T outshine them when it comes to the Olympics.

    What's the advantage of broadcasting ABC in 1080i? Is ABC providing those few affiliates with a 1080i feed? If not (and I really doubt they are), then the affiliates and just upscaling and interlacing 720p to 1080i.
     
    Last edited: Nov 19, 2017
  20. Nov 19, 2017 #820 of 1034
    alexb

    alexb Active Member

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    Yeah and is same for HBO in 98033, including the Comcast VOD which is identically compressed compared to the broadcast, annoying as heck.

    I would happily take better compression that uses 4:2:2 instead of 4:2:0 than 1080 content.
     

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