[opendtv] Re: Food for thought
- From: "Albert Manfredi" <bert22306@xxxxxxxxxxx>
- To: opendtv@xxxxxxxxxxxxx
- Date: Sun, 25 Feb 2007 17:18:21 -0500
Ron Economos wrote:
So for the BBC at 20 Mbps, they should be able
to get the same level of quality today at 12.8 Mbps
(assuming two 20% gains).
Stations now seem capable of transmitting one sports HDTV stream and one
SDTV stream without undue stress. I'm assuming that a 4 Mb/s SDTV stream can
accommodate sports programming too, although I don;t know if that's true.
If a 4 Mb/s SDTV stream can accommodate sports, then the time to consider
updating A/53 with the available candidate standard for AVC would be when
AVC, or whatever other codec, can reliably achieve HDTV in a range of
something like 5 to 11 Mb/s, respectively for 24p and sports 60p content. In
that case, you could transmit a 4 Mb/s SDTV stream along with the sports
HDTV stream in a total of about 15 Mb/s average, and another SDTV program
stream, within the 19.39 Mb/s channel.
If sports SDTV takes more than 4 Mb/s, the new codec would have to be that
much more efficient.
This would permit a transition to the new codec, without more spectrum and
without disenfranchising anyone. And eventually, more program choices when
H.262 is dropped entirely.
The Aussies, who must simulcast HDTV now anyway, might think of
transitioning sooner, I would think.
Bert
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