[opendtv] Re: Time to give up on 1080i for football
- From: Albert Manfredi <albert.e.manfredi@xxxxxxxxxx>
- To: <opendtv@xxxxxxxxxxxxx>
- Date: Mon, 7 Dec 2009 20:07:49 -0500
Peter Wilson wrote:
> 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.
Makes good sense for prooduction and archiving, IMO.
> 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.
If it were up to me, I would incorporate the 1080/60p (or 50p) options at the
same time that the H.264 compression algorithm is introduced. I would do that
whether or not silicon exists now, on the assumption that at least eventually,
H.264 would become tweaked enough to make 1080/60p feasible at the current HD
bit rates.
> 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.
Yes, and that last sentence, which is the natural conclusion one would come to,
is precisely why I have never believed this to be true. The problem here is
semantics, I'm convinced.
I would readily agree that by some measures of efficiency, coding progressive
is more efficient than interlaced. For instance, I have no doubt that coding 60
frames per second in progressive mode is more efficient than coding 60 frames
per second (120 fields per second) interlaced.
I also wouldn't doubt that a heavily pre-filtered 1080/60p can fit in the same
channel as a 720/60p. But then again, the pre-filtered 1080/60p would also have
no more detail than the 720/60p.
If we are really to believe that 1080/60p takes up no more channel capacity
than 720/60p, then we are saying that 480/60p should take up no more capacity
than 720/60p, and by extension, no more bit rate than 1080/60p. Which I find
hard to swallow.
Everything costs more in 1080p. The interframes, the motion vectors, the
interpolated frames, the predictive frames. Unless you pre-filter the quality
down.
Bert
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