[opendtv] Re: 1080p@60 for MPEG-2
- From: "John Willkie" <johnwillkie@xxxxxxxxxxxxx>
- To: <opendtv@xxxxxxxxxxxxx>
- Date: Sat, 10 Nov 2007 14:29:17 -0800
I think that the ITU is actually something of a laggard on this, in the
sense that the ATSC has already announced work on incorporating
1080x1920x60p into A/53.
Main Profile@ Main Level (MP@ML) and Main Profile at High Level (MP@HL) are
existing combinations. The former is sometimes called "EDTV" (by some) and
the latter is called "HDTV". Maximum permissible bit rates (per 13818-1)
are classified by profile and level. Nothing new is contained in this
paragraph.
John Willkie, who is "fairly certain" that he has read about the A/53 work
program in a public document detailing future ATSC work plans.
-----Mensaje original-----
De: opendtv-bounce@xxxxxxxxxxxxx [mailto:opendtv-bounce@xxxxxxxxxxxxx] En
nombre de Albert Manfredi
Enviado el: Saturday, November 10, 2007 2:18 PM
Para: opendtv@xxxxxxxxxxxxx
Asunto: [opendtv] Re: 1080p@60 for MPEG-2
Ron Economos wrote:
> A proposal has been submitted to add 1080p@60
> (and 1080p@50) to MPEG-2. A new level called
> "High Progressive" would be added.
>
http://ftp3.itu.ch/av-arch/jvt-site/2007_10_Shenzhen/JVT-Y086.zip
>
> Note: the ITU website has been up and down the
> last day or so.
Was down last night, back up now.
First of all, I think it's a great idea to add 1080 at 60p in MPEG-2
compression, because it makes it far more likely to get adopted in countries
that already have HDTV using MPEG-2 compression. So, good for the ITU.
Secondly, I don't really understand Tables 1 and 8-11. What they call "high
level," as opposed to "high progressive," looks an awful lot like 1080 at
60i to me, including in the number of samples/sec (62.6 Msamles/sec). And
yet, they call this 60 frames/sec, even in a table in which "main level" is
shown to include such options as 720 X 576 at 30 frames/sec.
Something isn't consistent.
Would be nice to see how MPEG-2 compression does with a 1080 at 60p stream
crammed into 19.39 Mb/s. I've heard a lot of people saying that progressive
compresses better than interlace, so the question will be whether it
compresses "better enough" to fit.
Bert
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