Can you see the different between 480i vs 480P ?

[SingSing]

Many progressive player support 480i output too.
So if you switch bewteen the two format, can
you and how much is the different between 480i and 480P ?

Does the different depends on some other factors too ?

[BJ_M]

yes-- what you are viewing it on and also what the origanal source was and also the bit rate and a number of other factors .

[hp_lovecraft]

Sometimes it can be hard to tell because you also need a progressive TV.

Progressive TVs can convert 480i to 480p on the FLY, so if you switched your DVD player from 480p to 480i, your TV would still show it as 480p.

You have to manually force your TV to display interlaced to compare 480i to 480p.

Yes, you can definetly tell the difference, especially on large TVs. There is no flicker, and no interlace artifacts. However, since nearly all DVDs store the video as 480i, it needs to be converted to 480p, and there is different ways to do it. Usually the player does a better job then the TV, but that is not always the case.

Nick

[SingSing]

Hmm, Why most movies want to store as 480i ?
I can see interlace artifact, but hardly flicker on Projection TV.

[snowmoon]

What type of projection. Since projection does not = progrogressive it makes a big difference. If you have a progressive capable TV then you should get a nice DVD player like the Panasonic models.

If it's a standard definition projection TV then it's interlaced to begin with and you will see artifacts if you look close enough.

DVD's are stored at 480i because that's the standard. Most DVD's can be decoded at 480i or 480p24 because of the way that most movies are encoded.

[SingSing]

Does it means that a 480i movie is half the size of 480p ?

[hp_lovecraft]

Does it means that a 480i movie is half the size of 480p ?

Sorta...
It means that a 720x480 video, at 30 frames a second, is actually a 720x240 video, running at 60 frames a second.

So, half the size, but twice as many frames.....

nick

[SingSing]

if most of the movie are 480i ( DVD and SVCD ), then
there are very little benefit to have a progressive player.

We just watch every frame twice at 30 fram/second !

[snowmoon]

NO!

Progressive players reconstruct a full 720x480p 60 fps ( or higher ) signal based on many factors. Some early versions do not, but today's progressive players are very advnaced.

[hp_lovecraft]

Singsing-
Basically, there is a number of ways to convert the 480i to 480p:
Bob, Weave, Filter, Adaptive, film-mode,etc.


Some methods are better then others. Most DVD players will take the 2 digital 740x240 frames, and convert to 740x480 (for movies), for prefect progressive video.

TVs only see an analoge image, so they can not get prefect progressive pictures. The cheap 480p TVs will simple double each 740x240 line, to make 740x480, while most TVs will try to combine 2 frames, then blur the picture slightly to cover up comb errors.

To make things worse, film is recorded at 24 fps, so converting to 60 fps, then back to 30 fps for progressive output causes alot of problems. This is called the 2-3 pulldown. Most cheap players do not to 2-3 properly, and mix odd frames together, while expensive players will drop the frame.
For more info:

http://www.hometheaterhifi.com/volum...e-10-2000.html

nick