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A-100 and 1080i or 720p
09-03-2008, 12:38 AM (This post was last modified: 09-03-2008 12:39 AM by nkarnold.)
Post: #1
A-100 and 1080i or 720p
Hi.
I've had my A-100 for about 2 months now and i'm getting frustrated with information i've read in other 'video' type forums about what setting is best. 1080i or 720p

My TV (Pana 42), only supports up to 1080i (no 1080p)

From other threads in non-NMT forums, I've read, some people are saying that you can't really tell the difference between 1080i and 720p playback..

But thats where i get confused.
720p is 1280x720 progressive
1080i is 1920x1080 interlaced

Thats a lot of 'pixel' difference between the two and I've always thought that 1080i would always be superior.

Any comments, greatly recieved. thx in advance

Popcorn A-100
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09-03-2008, 02:13 AM (This post was last modified: 09-03-2008 02:50 AM by cdx47.)
Post: #2
RE: A-100 and 1080i or 720p
(09-03-2008 12:38 AM)nkarnold Wrote:  My TV (Pana 42), only supports up to 1080i (no 1080p)

From other threads in non-NMT forums, I've read, some people are saying that you can't really tell the difference between 1080i and 720p playback..

Assuming that
1. You are watching 1080i/p sources.
2. You are sitting close enough to see the difference.

Then you should be able to tell the difference.
The following link tells you all you need to know.
http://www.carltonbale.com/2006/11/1080p-does-matter/

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09-03-2008, 04:04 AM
Post: #3
RE: A-100 and 1080i or 720p
(09-03-2008 12:38 AM)nkarnold Wrote:  Hi.
I've had my A-100 for about 2 months now and i'm getting frustrated with information i've read in other 'video' type forums about what setting is best. 1080i or 720p

My TV (Pana 42), only supports up to 1080i (no 1080p)

From other threads in non-NMT forums, I've read, some people are saying that you can't really tell the difference between 1080i and 720p playback..

But thats where i get confused.
720p is 1280x720 progressive
1080i is 1920x1080 interlaced

Thats a lot of 'pixel' difference between the two and I've always thought that 1080i would always be superior.

Any comments, greatly recieved. thx in advance



What kind of TV you have? Plasma? LCD? What's the native resolution? I've got a 40" LCD with a native resolution of 1366X768. It "supports" 1080i, but it will NEVER show 1080i better than it shows 720p simply because of the native resolution.
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09-03-2008, 06:10 AM
Post: #4
RE: A-100 and 1080i or 720p
My TV has 1080i only and I have it set to 720p all the time.

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09-03-2008, 07:45 AM (This post was last modified: 09-03-2008 07:48 AM by nkarnold.)
Post: #5
RE: A-100 and 1080i or 720p
(09-03-2008 04:04 AM)nobodyzhome Wrote:  
(09-03-2008 12:38 AM)nkarnold Wrote:  Hi.
I've had my A-100 for about 2 months now and i'm getting frustrated with information i've read in other 'video' type forums about what setting is best. 1080i or 720p

My TV (Pana 42), only supports up to 1080i (no 1080p)

From other threads in non-NMT forums, I've read, some people are saying that you can't really tell the difference between 1080i and 720p playback..

But thats where i get confused.
720p is 1280x720 progressive
1080i is 1920x1080 interlaced

Thats a lot of 'pixel' difference between the two and I've always thought that 1080i would always be superior.

Any comments, greatly recieved. thx in advance



What kind of TV you have? Plasma? LCD? What's the native resolution? I've got a 40" LCD with a native resolution of 1366X768. It "supports" 1080i, but it will NEVER show 1080i better than it shows 720p simply because of the native resolution.

Its a Panasonic Plasma TX42PX60. Not sure what it's native res is, again i assumed it was 1920x1080 when using 1080i
(09-03-2008 02:13 AM)cdx47 Wrote:  Assuming that
1. You are watching 1080i/p sources.
2. You are sitting close enough to see the difference.

Then you should be able to tell the difference.
The following link tells you all you need to know.
http://www.carltonbale.com/2006/11/1080p-does-matter/

There's another problem, some of my content is very mixed
576 - DVD's
720p - MKV's
1080p - MKV / Bluray .M2TS

The link you posted, really all about 1080p and why / when it should be used. (unless i missed something)

Thanks though it was good info
(09-03-2008 06:10 AM)chris57 Wrote:  My TV has 1080i only and I have it set to 720p all the time.

Thanks for that, but can you tell us why ?

Is it for the same reasons i've read in other forums ?

Popcorn A-100
Archos 604, 704, 605, 705, XBOX 360, PS3

Jesterware - Home of Quality DVD Ripper and Video File Converter Software
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09-03-2008, 09:50 AM (This post was last modified: 09-03-2008 10:00 AM by cdx47.)
Post: #6
RE: A-100 and 1080i or 720p
(09-03-2008 12:38 AM)nkarnold Wrote:  
(09-03-2008 06:10 AM)chris57 Wrote:  My TV has 1080i only and I have it set to 720p all the time.

Thanks for that, but can you tell us why ?

Is it for the same reasons i've read in other forums ?

Pretty much. It usually an interlacer issue. As for its native resolution look in the manual. 1080i models tend to be 1024/1360x768 resolution. If that is the case then use 720p.
Otherwise forget what you have read. Just look at the picture and use whichever you prefer!
If they look the same then use 720p.

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09-03-2008, 10:08 AM
Post: #7
RE: A-100 and 1080i or 720p
It's not that many pixels diffence;

1920x1080 = 2073600

1280x720 = 921600

Ok that's a massive difference, BUT, and here is the thing, because the picture is interlaced each frame only shows you half of the available pixels.

so 2073600/2 = 1036800

So it's much closer than you think.

THAT SAID

If your TV was capable of showing 1080i (and I mean showing it rather than accepting it), then it would also be capable of showing 1080p. Your TV will deinterlace the 1080i signal and show it at your native res 1366x768 (normally).

This is where it gets complicated, some TV's have better deinterlace methods/scalers, so on one TV 1080i will look better than 720p on others the other way round.

Set both, see what you prefer, stick to it.
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09-03-2008, 10:29 AM
Post: #8
RE: A-100 and 1080i or 720p
(09-03-2008 10:08 AM)daniel_owen_uk Wrote:  This is where it gets complicated, some TV's have better deinterlace methods/scalers, so on one TV 1080i will look better than 720p on others the other way round.

Set both, see what you prefer, stick to it.

Great minds etc etc

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09-03-2008, 11:22 AM (This post was last modified: 09-03-2008 11:24 AM by spawn.)
Post: #9
RE: A-100 and 1080i or 720p
The Pana PV60 is 1024x768 native resolution

Allthough not documented it actually also support inputs of 1080p (manual only says up to 1080i) - but it cannot display 1080p resolution. Every input will be rescaled to native resolution of 1024x768.

It is not 24p ready - thus input needs to be 50hz for PAL 25fps material and 60hz for NTSC 29.97fps and film 23.976 material.
Best input result on the PV60 are usually 720p as the deinterlacer in the PCH does a better job than the PV60, but most videomaterial you feed will propably be progressive anyways and thus a progressive output would still be best.

Thus I'd reccomend using an output of 720p60 normally, and using the softswitch to switch to 720p50 when playing 25fps material.

If the material are true 1080p - then try the output 1080p59.97 - that should actually give you a slightly better picture due to only one scaling being done - but only for 1080p material. All other I would go for 720p on your display.

Apart from this I agree to just try and see which you prefer. There are no rules you have to obey - youre the one having to look at it, thus what ever suits you best is the best option for you Smile
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09-03-2008, 12:02 PM (This post was last modified: 09-03-2008 05:23 PM by cdx47.)
Post: #10
RE: A-100 and 1080i or 720p
(09-03-2008 12:38 AM)nkarnold Wrote:  Any comments, greatly recieved. thx in advance

cdx47 Wrote:It usually an interlacer issue. As for its native resolution look in the manual. 1080i models tend to be 1024/1360x768 resolution. If that is the case then use 720p.
Otherwise forget what you have read. Just look at the picture and use whichever you prefer!
If they look the same then use 720p.

daniel_owen_uk Wrote:If your TV was capable of showing 1080i (and I mean showing it rather than accepting it), then it would also be capable of showing 1080p. Your TV will deinterlace the 1080i signal and show it at your native res 1366x768 (normally).

This is where it gets complicated, some TV's have better deinterlace methods/scalers, so on one TV 1080i will look better than 720p on others the other way round.

Set both, see what you prefer, stick to it.

spawn Wrote:It is not 24p ready - thus input needs to be 50hz for PAL 25fps material and 60hz for NTSC 29.97fps and film 23.976 material.
Best input result on the PV60 are usually 720p as the deinterlacer in the PCH does a better job than the PV60, but most videomaterial you feed will propably be progressive anyways and thus a progressive output would still be best.

Thus I'd reccomend using an output of 720p60 normally, and using the softswitch to switch to 720p50 when playing 25fps material.
Apart from this I agree to just try and see which you prefer. There are no rules you have to obey - youre the one having to look at it, thus what ever suits you best is the best option for you

Just to add that the deinterlacers and scalers in the PCH and PC graphics cards tends to be better than most TVs

Even more great minds Big Grin

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09-03-2008, 04:15 PM
Post: #11
RE: A-100 and 1080i or 720p
all this talk about FPS has me wondering why there is no 720p24. my TV has 24FPS processing but is only 720p. it will accept 1080p input, but I'm wondering why the 24 option is not there for 720p.
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09-03-2008, 04:17 PM
Post: #12
RE: A-100 and 1080i or 720p
because the hdmi standard dont has 24p on 720p so there is no way for us to enable that
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09-03-2008, 04:34 PM
Post: #13
RE: A-100 and 1080i or 720p
oh damn. oh well. The TV also does reverse 3:2 on 60fps (or 59.9whatever) input so it's not that big a deal.
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