[opendtv] Re: Uruguay adopts DVB-T and DVB-H
- From: "Albert Manfredi" <bert22306@xxxxxxxxxxx>
- To: opendtv@xxxxxxxxxxxxx
- Date: Sat, 08 Sep 2007 18:18:07 -0400
Olivier Houot wrote:
You made no mistake, John, i was indeed wondering about the
possibility that they would transmit 1080@60p, thereby setting
up the TV system with the highest spatial/temporal information
contents in the world, except for the NHK ultra HD system,
which won't be available anytime soon.
Of course many would argue that it is not clear how much of
that information would finally make it to the end user through
compression, and this certainly is something to ponder, especially
if Brazil is limited to 6Mhz channels.
When push comes to shove, it looks like even the BBC HDTV trials limited
their HD bit rate, dedicated to one HD program, to about 19 Mb/s. So the 6
MHz channel of SBTVD is not an issue, given that whatever ISDB mode they are
considering is good for 19 Mb/s per channel. Must be that available encoders
are limited to that?
If you look at other Brazilian web sites, they mention that two HD programs
can fit in a single 6 MHz channel. Although these numbers are not hard, i.e.
you can fudge around and force-fit all sorts of stuff in a 19 Mb/s channel,
my interpretation is that they are referring to 720 at 60p or 1080i, using
H.264 compression.
BTW, did you notice in the viewgraph presentation that 80 percent of their
TV sets are 14"? That's probably why HD is not being given the highest
priority in the short term.
Bert
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