[opendtv] Re: Time to give up on 1080i for football
- From: "Peter Wilson" <peter.wilson@xxxxxxxxxx>
- To: <opendtv@xxxxxxxxxxxxx>
- Date: Mon, 7 Dec 2009 22:42:11 -0000
Hi All,
I sit on a DTG http://www.dtg.org.uk/ Group Committee in the UK chaired by
BSkyb looking at the changes needed in infrastructure to move to 1080P50 for
Production. There is serious intent from Several UK Broadcasters in moving.
This will give them a quality archive and quality conversion to the
transmission formats.
In the UK there was serious consideration given to Terrestrial broadcast of
1080P50 once the Analogue to Digital switchover is complete and the
frequencies are reallocated. Unfortunately Production Silicon will not be
available in time for mass rollout before the London Olympics so it wont
happen this time round.
There is plenty of data produced by the EBU which proves that there is no
coding penalty over 1080I50 if you encode 1080P50 as progressive encoding is
more efficient. Craig has been saying this for a while. In this case 1080P50
or 720P50 becomes a life choice.
Best Regards,
Peter
-----Original Message-----
From: opendtv-bounce@xxxxxxxxxxxxx [mailto:opendtv-bounce@xxxxxxxxxxxxx] On
Behalf Of Craig Birkmaier
Sent: 07 December 2009 21:54
To: opendtv@xxxxxxxxxxxxx
Subject: [opendtv] Re: Time to give up on 1080i for football
At 9:56 AM -0600 12/7/09, Manfredi, Albert E wrote:
>
>We all know that now HD CRTs are virtually gone, and that cameras
>don't output 1080i, so the options of 720p or 1080p for transmission
>are obvious ones.
Excuse me?
The vast majority of HD cameras in existence today output 1080i,
unless they are specifically designed for 24P, or limited to 720P.
Almost every truck that is originating live sporting events in HD can
output 1080i or 720P.
Perhaps you are confused, because some camera designs say they use
progressive sensors, and some of the newer cameras do have the
ability to output 1080@50/60P. While this is true, almost the entire
production chain from switchers, to HD-SDI distribution gear, to the
MPEG-2 encoder operate at a nominal data rate of 1.485 Gbit/s.
In order for the existing fleet of HD remote trucks to support
1080@60P, almost every piece of video processing gear in the truck
would need to be replaced.
>I noticed, for example, that WETA (our PBS station) changed from
>1080i to 720p some time ago (not sure exactyl when, but I'm sure
>that they did). Makes sense to me.
>
>I'm amazed at how much of a big deal was made of the one 1080i mode
>in the HDTV standards, back then.
And for good reason. Interlace has NO PLACE in a world where entropy
encoding is used for emission. It made sense as a compression
technique in an analog world, but causes more trouble than it is
worth in the digital world.
Regards
Craig
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