[opendtv] Re: Time to give up on 1080i for football
- From: "Manfredi, Albert E" <albert.e.manfredi@xxxxxxxxxx>
- To: "opendtv@xxxxxxxxxxxxx" <opendtv@xxxxxxxxxxxxx>
- Date: Tue, 8 Dec 2009 17:03:42 -0600
John Shutt wrote:
> From the EBU:
>
http://tech.ebu.ch/docs/testmaterial/ibc09_10things_1080p50.pdf
>
> What bit-rate is required for broadcasting with MPEG-4
> H.264/AVC?
>
> The DVB Project has incorporated 1080p/50 in its recommended
> distribution compression formats, which may be used for future
> broadcasting. Perhaps surprising at first, initial tests at the
> EBU have shown that 1080p/50 will not require more bitrate than
> 1080i/25 for broadcasts, but naturally it will show better
> picture quality on large displays. Ask an EBU Engineer for the
> detail of the results. So, whilst production systems will
> require more bit-rate than older HDTV formats, distribution
> should require the same bit-rate as 1080i/25, and only about
> 15-20% more than 720p/50.
My bet is that this is the same sort of complicated result as the one that says
that H.264 is twice as efficient as H.262. Push comes to shove, H.262 can also
pack 10 SD channels in a 19.39 Mb/s channel. And the bit rates assigned to HD
channels are roughly the same, by their estimates.
Let's see what happens beyond "initial tests." If average bit rate of 1080/50p
is 20 percent higher than 720/50p, peaks are probably quite a bit more than
that, is one guess.
Bert
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