[opendtv] Re: DVB considers SVC for 1080p and hierarchical modulation

  • From: Tom Barry <trbarry@xxxxxxxxxxx>
  • To: opendtv@xxxxxxxxxxxxx
  • Date: Wed, 10 Dec 2008 19:44:03 -0500

Will ATSC M/H even have enough throughput for a single decent 720p stream after error correction? I'm not saying it won't but some other figures bandied about on this list a couple months ago made me doubt that. Is this public yet?


- Tom (not on the committee)


John Willkie wrote:
Sounds very kludgish to me.  Wouldn't it be "neat" if ATSC M/H 1.0 provided
support for SVC?

SVC provides for a main and an enhanced layer, in my understanding, which is
limited to AVC.  Seems to me that you could have a 720p main layer and a
1080p enhanced layer.  Not too elegant, if it works at all.

John Willkie

-----Mensaje original-----
De: opendtv-bounce@xxxxxxxxxxxxx [mailto:opendtv-bounce@xxxxxxxxxxxxx] En
nombre de Olivier Houot
Enviado el: Wednesday, December 10, 2008 1:02 PM
Para: opendtv@xxxxxxxxxxxxx
Asunto: [opendtv] DVB considers SVC for 1080p and hierarchical modulation

Some interesting perspectives in the last issue of DVB scene (www.dvb.org).

There is an article about SVC (scalable video coding) that says it could be useful for future 1080p services.

Since current boxes would not be compliant, there would be a need to simulcast a 1080p and a 720p version of a program.

They consider 13 Mbps would be needed for the 1080p stream, and 8 Mbps for 720p (perhaps a bit high, since this is the average bitrate of current 1080i broadcasts). That would be a total of 21 Mbps.

But using SVC, a two layered 720p/1080p stream would use just 15,4 Mbps. I have to say it is not clear to me how current boxes could extract the 720p stream without being designed for SVC , though.

Also, the idea of broadcasting a robust stream for difficult reception conditions, with additionnal layered information in a more fragile but higher bitrate stream permitted by hierarchical modulation makes a come back. Tests performed with older MPEG2 system were unable to show a clear advantage with this method in the past, but it seems the efficiency of the new SVC scheme makes it worth to reconsider.

In the same DVB scene issue, they mention an OTA demo of DVB-T2 at 36 Mbps.



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