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Old 12-20-2016, 03:21 PM
 
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My cable box can be set to output in 1080i or 720p. I set it to 1080i and the picture is fine although the TV is described as "1080p."

TVs are all described as 1080p, not 1080i. Doesn't that just mean it can receive either one, and also 720p?

I know what i and p mean. I also know 720i doesn't exist.
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Old 12-20-2016, 03:29 PM
 
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Does a DVD or Bluray player, send out signals in i or p, or neither?
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Old 12-20-2016, 03:49 PM
 
Location: Birmingham
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Set it to 1080i. That is better than 720p. The i stands for interleaved. P stands for progressive scan. P is better than i and your blu ray player uses p. Most cable boxes spit out i.
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Old 12-20-2016, 04:11 PM
 
Location: Mount Laurel
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Quote:
Originally Posted by robertpasa View Post
My cable box can be set to output in 1080i or 720p. I set it to 1080i and the picture is fine although the TV is described as "1080p."

TVs are all described as 1080p, not 1080i. Doesn't that just mean it can receive either one, and also 720p?

I know what i and p mean. I also know 720i doesn't exist.

The answer lies on a few factor.


What TV you have and it's capabilities.
What is coming into your cable box (are you subscribed to HDTV?)
What do you want?


BTW.. i actually means interlaced, not interleaved.
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Old 12-20-2016, 06:25 PM
 
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The TV should recognize the interlaced material and adjust accordingly.
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Old 12-21-2016, 08:56 AM
 
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Geesh, thought 1080i went the way of the landline. Is cable TV technology really that outdated that it does not offer 1080P?

Here's an article that discusses the difference, which is non-trivial, but not the only way cable companies cheat their customers on image quality. 1080i vs. 1080p: What's the Difference? | News & Opinion | PCMag.com
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Old 12-21-2016, 10:21 AM
 
Location: McAllen, TX
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I've never seen cable spit out 1080p. The cable box itself is not capable. Dish network and DirecTV claimed to be able to on certain channels like VOD but since I never did VOD or even care I never saw it.I dropped dish some time back. They just love to raise your prices and I got tired of it. I don't think their receivers were even capable of 1080p so it may have been BS. Not only that 1080p requires double the bandwidth (I think) than 1080i.
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Old 12-21-2016, 10:26 AM
 
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One more reason to dump cable. Personally, never had it. Seems cable companies would rather push more channels at ever increasing prices than give you folks a crumb of better quality. And yes, 1080p uses twice the bandwidth, in theory. Since cable companies compress the cr*p out of their signals, though, who knows what the consumer gets.
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Old 12-21-2016, 01:37 PM
 
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Quote:
Originally Posted by gguerra View Post
Not only that 1080p requires double the bandwidth (I think) than 1080i.
Nope it's the same, if anything progressive might be less because it might be 24FPS. Typical video is 30FPS, with progressive each frame is a full image like film for example. For Interlaced each frame consists of two frames with alternating fields. The blue light in this video is moving extremely fast, the split beam is actually the same beam of light 1/60th of second apart.

It's the same amount of data required for either assuming the same overall frame rate.





This looks fantastic on an old TV meant to display it. Your results will vary on monitors/TV's designed for progressive display
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Old 12-21-2016, 03:47 PM
 
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^ Not quite. Ignoring compression, at the same frame rate (important factor), 1080p will have twice the bandwidth. 1080p at 24fps, a rate often used for movies, will have twice the rate of 1080i at 24fps. Interestingly, many cable channels use neither. They use 720p, specifically ESPN, because it handles fast motion well at a decently low data rate. Now the question is whether or not folks can see a difference among these choices! (except in rare examples like above)
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