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Posted by Jukka Aho on 12/05/06 23:11
moviePig wrote:
>> The question was [...] how this [aspect ratio] information is
>> relayed [from an American DVD player] to the [American HD]tv
>> set so that aspect ratio switching works automatically. (Note:
>> we're talking about full-frame 4:3 and full-frame 16:9 signals
>> here. There are no black bars in the incoming signal that the
>> tv set could detect.)
> Doesn't the player send a digital stream of "square" pixels to the
> (digital) tv?
The original poster ("Lincoln Spectator") didn't specify the make and
model of his DVD player, or the exact type of connections he is using.
What he said was:
"Frankly, I love the fact that when I put in an anamorphic DVD
and start playing the movie, the image gets wider. It's like
the end of the prologue in This is Cinerama. THAT's what a
widescreen TV should do."
DVD players can be connected to a tv set in a number of ways:
HDMI(/DVI), component (YPbPr), SCART RGB (in Europe), s-video (Y/C),
composite (CVBS).
Only one of these - HDMI(/DVI) - is digital.
Then again, HDMI might of course be the key here, since HDMI streams
carry aspect ratio flags. If "Lincoln Spectator" is using HDMI cable to
connect his DVD player to his tv set, there is no mystery. (But the
question still remains: is there an American standard for signalling
aspect ratios over YPbPr, Y/C, or CVBS connections, or is HDMI the only
way to get aspect ratio signalling?)
As for the squareness of the pixels, HDMI is designed to carry common
SDTV formats, such as (720×)480i/30 and (720×)576i/25, with their
non-square pixels. (Normal, standard definition DVDs use these formats
and do not have square pixels.)
--
znark
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