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Posted by John Lockwood on 08/29/06 10:42
On 28/8/06 13:32, in article
wnBIg.2361$xQ1.106@newsread3.news.pas.earthlink.net, "Geoff"
<nospam@nospam.com> wrote:
>> It depends on whether the player converts formats to the user's
>> chosen output format. Most do.
>
> That is why I am confused. A DVD is just numbers and an LCD using DVI is
> displaying the numbers sent to it. There is no conversion of one format to
> another (numbers that represent the picture/movie come off the DVD and are
> sent to the LCD via the DVI port).
>
> So, does ntsc or pal matter in a situation like that?
The numbers of pixels differs between NTSC and PAL (PAL has more) and the
refresh rate also differs (60Hz vs. 50Hz).
A PAL DVD might have slightly better detail on an LCD due to the fact it
starts off with more pixels.
However converting NTSC to PAL (or vice versa) can slightly alter the speed
of playback (to most people this will not be noticable), this might mean it
takes slightly longer/shorter to play the same film or that if you carefully
watched it a 'converted' playback might have a slight jerk every second.
This is because if NTSC has 60 frames per second and is being shown on a PAL
display which can only show 50 frames per second then 10 frames per second
have to be thrown away (or in the other direction an extra delay inserted).
I seem to be noticing something like this with a TV recording from DVB-T
made using Media Center and then played back on a computer LCD. This shows
up particularly for the 'ticker' displays going across the bottom of news
channels. When this is viewed live on an analogue TV it is perfectly smooth,
but when shown on the computer LCD using Media Center it has a very slight
judder (the computer is easily fast enough not to be causing this itself).
While LCD TVs usually don't let you alter the refresh between 50Hz and 60Hz
some computer LCDs do. Now that I have thought about this I will have to
check to see if I can alter my computer LCD and see if that helps.
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