[opendtv] Re: (no subject)
- From: "Hughes Gary-DJWV76" <ghughes@xxxxxxxxxxxx>
- To: <opendtv@xxxxxxxxxxxxx>
- Date: Tue, 15 Dec 2009 20:48:35 -0500
MPEG-2 1080p60 would require signaling Main Profile at HighP level,
which simply did not exist when most deployed receivers were built (the
amendment to H.263/MPEG-2 part 2 has a publish date of Mar '09).
Receivers should politely refuse to decode it unless they have been
built to allow it.
The cited article about ESPN makes no mention of MPEG-2. I would hazard
a guess that they plan to distribute in AVC 1080p60 and the headend
receivers will down convert to MPEG-2 720p60 until such time as the MSOs
want to offer the 1080p60 service in AVC. HBO are already doing
something similar for their HD feeds, i.e. AVC feed converted to MPEG-2
video in the headend, don't know what picture geometry they are using.
gary
Gary Hughes
Video Architect
Distinguished Member, Technical Staff
Motorola On Demand Video, MA34
80 Central St.
Boxborough, MA 01719
Email: ghughes@xxxxxxxxxxxx
Office: 978 266 7269
Mobile: 978 339 3615
Fax: 978 264 9108
> -----Original Message-----
> From: opendtv-bounce@xxxxxxxxxxxxx
> [mailto:opendtv-bounce@xxxxxxxxxxxxx] On Behalf Of Manfredi, Albert E
> Sent: Tuesday, December 15, 2009 11:50 AM
> To: opendtv@xxxxxxxxxxxxx
> Subject: [opendtv] Re: (no subject)
>
> Dan Grimes wrote:
>
> > Would it [1080/60p over MPEG-2] really break the receivers?
> > In other words, would the receiver still be able to use the
> > other versions but just not be able to use the 1080 60P
> > content?
>
> The 1080/60p stream would be the only one that legacy
> receivers would miss. Other subchannels should work fine.
>
> As I see it, the problem is that 1080/60p would not leave
> very much room for anything else. It's more stressful than
> having two 720/60p streams going at the same time, because
> you don't have stat mux as a technique to help out with the
> peaks. With H.264, at least there's a chance that the extra
> efficiency will make the peaks easier to fit.
>
> Bert
>
>
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