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Info kit for HD dvd's, regular dvd's and nessessary resolution.

post #1 of 5
12/4/05 at 12:51pm
Thread Starter 

http://en.wikipedia.org/wiki/HDTV

"The resolution stored on the DVD is actually 720x480. However, to get
the correct 16:9 aspect ratio, we'll have to stretch it a little, to
853x480.

A 720p 16:9 display has a resolution of 1280x720, clearly more than
the 853x480 the DVD is providing, so yes, it's simply scaled up. The
"full resolution" of the display isn't being used.

A 480i 4:3 display has a resolution (assuming square pixels) of
640x480. However, to display widescreen material, only a portion of
this can be used. For 16:9 material, the usable "window" is only 360
lines high, far less than the 853x480 resolution from the DVD. So it
must be downscaled, and you are actually losing resolution from the
DVD. The resolution is lost *because* of the difference in aspect
ratio.

This may seem counterintuitive, because both the TV and the DVD are
natively 480i, but it occurs because of the anamorphic encoding,
described in my original answer, used to push the DVD format to its
limits, and provide extra resolution to displays capable of using it.

The difference is even more pronounced when viewing a "wider" film
with an aspect ratio greater than 16:9. "Scope" films are also very
common, and have an aspect ratio of 2.35:1. On a 480i set, the usable
window would be only 272 lines high, resulting in use of only 57% of
the resolution available from the DVD."
http://answers.google.com/answers/threadview?id=301032

"LCD panels, DLP chips, and LCOS chips are all exclusively progressive scan devices. They cannot operate any other way."
http://www.projectorcentral.com/480i_vs_480p.htm


http://www.trustedreviews.com/articl...d=48&page=5043

Dvd's look better on Notebooks because they are upscaled from 480i to it's full definition.
Intel integrated graphics can play HD DVD's at 30 frames per second, which makes it EDTV not HDTV.

So Blue ray and Hd-dvd will be downscaled and look worse, because they will be playing at 30 frames per second EDTV instead of HDTV.

What this all means is. Don't get integrated graphics if you want to buy High definition dvd's for your notebook to play.

Also Monitors that are not hdcp certified can't play Blue ray/ hd-dvd's anyway.

Napa and Yonah are Hdcp certified and released in 2006.
http://www.theinquirer.net/?article=25642
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post #2 of 5
12/6/05 at 8:35am
Thread Starter 
Edited. bump.
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post #3 of 5
12/13/05 at 2:39am
Thread Starter 
This is a 480p DVD screen size.

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post #4 of 5
12/13/05 at 4:02am
Means nothing ;-) By the time HD-DVD or Blu-ray comes out with large amount of media readily available on the same street date as regular DVD, your current laptop will probably be obsolete. Also saying that current DVD looks better on a notebook is a joke. Anytime you upscale an image, you'll be introducing noise (the amount of which will depends on the scaling amount, graphics chip and the playback software). So most non-HD contents usually look worst on a HD display of any type expect CRT.

Also. HD media comes in many forms. Currently, TV broadcast comes in 2 favors. 1080i and 720p with 1080p probably a good few years down the road. Leaving HDCP aside for the moment. You'll need a 1280x800 screen (since widescreen laptop is 16:10 not 9) to watch 720p contents and a 1920x1200 screen to watch 1080i/p in native format. The graphical demands on driving a 1920x1200 display at 30fps is pretty serious and although Intel claims it can be done on a GMA chip (although it should handle 720p fine). I would prefer something with a bit more horsepower behind it (especially for 1080P).

Now onto HDCP, provided that you get a laptop with a HD DVD (either favor). You should have no problem playing it back on the laptop screen. but if you want to connect to an external monitor, then it will have to support HDCP or the movie will only play in a lower res like todays DVD. HDCP is there to prevent un-authorized capture of the HD content between the the streamig device and the display.

A simple way to test is to download some 1080P sample from wmvhd.com and see if you laptop can handle it or use the test program on the site to see your laptops rating. All I can say is that a Dothan 2.0 with 128MB X700 just barely handles the 1080p samples with no dropped frames so I wouldn't really count on being able to do it with a GMA chip.
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post #5 of 5
12/13/05 at 9:04pm
Thread Starter 
Quote:
Originally Posted by Wiz33
Means nothing ;-)
Saying that current DVD looks better on a notebook is a joke. Anytime you upscale an image, you'll be introducing noise (the amount of which will depends on the scaling amount, graphics chip and the playback software). So most non-HD contents usually look worst on a HD display of any type expect CRT.
This is the size dvd's are made in. Read the first post.

This is 4:3

Saying that squeezing that down to a 4:3 crt tv tube looks better is questionable.

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