[opendtv] Re: 20060807 Mark's Monday Memo
- From: "Donald Koeleman" <donald.koeleman@xxxxxxxxxx>
- To: <opendtv@xxxxxxxxxxxxx>
- Date: Fri, 11 Aug 2006 22:53:55 +0200
It's all 16:9, but wether this is anamorphic (just as with many regular
analog 16:9 broadcasts, PAL Plus is dead, btw and has been for years), or
all full horizontal resolution, I can not say for sure. If there are any
broadcasts using non square pixels, then it will be the 1080i ones, as per
Tom's BBC examples. 720P seems to be always 1280*720.
----- Original Message -----
From: "Manfredi, Albert E" <albert.e.manfredi@xxxxxxxxxx>
To: <opendtv@xxxxxxxxxxxxx>
Sent: Friday, August 11, 2006 1:19 AM
Subject: [opendtv] Re: 20060807 Mark's Monday Memo
Donald Koeleman wrote:
> Actually the world cup was converted from 1080i to 720P
> for Dutch cable (reportedly the Samsung boxes couldn't
> handle 1080i too well when using AVC compression).
That's 1280 X 720p, square pixels, right? So, presumably, 16:9.
Yup, I believe I provided a concise description in one of the previous
threads on deinterlacing.
> The BBC has chosen 1080i for their broadcasts (including
> the DVB-T trial), believe Sky eventualy chose the same,
> after publicly stating they would go with 720P.
But again, HDTV is square pixels and 16:9 (transmission standard, of
course). Any HDTV transmission standard I've ever seen specified,
including Australia, is 1920 X 1080 or 1280 X 720.
Well, what standard is there for the Beeb to stick to, well, the standard
imposed by Sky (hence the required firmware update for non-sky boxes,
something to do with triggers in the syntax, FTA boxes wouldn't even
recognize the FTA bbeeb broadcasts). Unlike Australia, or France this isn't
a government mandated and licensed terrestrial broadcast service, just a
year long experiment over satellite.
> The only more regular DVB-T HD broadcasts are in France,
> not sure if they are also using 1080i.
Well this is a 9 month long (divided in an initial test period showing world
cup and more, and a second following review by regulator CSA)experiment is
using two testchannels divided among the main broadcasters. Anyway, nowhere
does it say anything about aspectratios, anamorphic video, refreshrates and
so on.
Bert, gathering from your list, I think you were put of by the list of
minimum requirements a screen must posess to receive the HD ready logo, this
doesn't say anything about the actual broadcasts. As a matter of fact all
they do mention is that there is a quality difference comparing 576 lines
with 720 points (SD) (400K pixels) with the two million pixels of 1080 lines
with 1920 points.
....
In France, the HDTV standards are 1920 X 1080 at 50i or 60i and 1280 X
720 at 50p or 60p. And explicitly stated to be 16:9 aspect ratio, at
least by TF1 (one of the national networks that transmits HDTV).
http://www.tf1.fr/lachaine/programmes/emissions/0,,3307180,00.html
I figure any country that has an organization like the Academie
Francaise can darn well specify something as comparatively innocuous as
an aspect ratio standard!
> Anyway there is no official EU standard/guideline.
Perhaps, but it seems clear where the wind is blowing.
> You can see some of the 14:9 compromise on BBC Prime/(World?)
> as well.
I'm not sure this is a relevant point, Donald. I believe that Alan
Roberts told us on here that the BBC transmits widescreen DTV programs
as true 16:9, and only uses 14:9 when they transmit widescreen over
analog.
..
Well, it was just to say that the compromise isn't limited to the analog
channels. BBC 1 and 2 on cable are sourced from the digital satellite feed,
that's why they have been lacking the good ol' ceefax teletext service as
the satellite service moved to an (opentv?) iTV version labelled 'Digital
Teletext'. BBC Prime is their internationally licensed channel, no reason to
expect any analog origination here.
....
The BBC News we get on DTT here is 14:9. However judging from the very
grainy image, I'm fairly certain that PBS is upconverting these from a
BBC analog feed. Hence, the 14:9 ratio which I regularly watch in
full-screen 16:9.
Bert
----------------------------------------------------------------------
You can UNSUBSCRIBE from the OpenDTV list in two ways:
- Using the UNSUBSCRIBE command in your user configuration settings at
FreeLists.org
- By sending a message to: opendtv-request@xxxxxxxxxxxxx with the word
unsubscribe in the subject line.
Other related posts:
