[opendtv] DVB considers SVC for 1080p and hierarchical modulation
- From: Olivier Houot <olho_avatar_i@xxxxxxxxxxxx>
- To: opendtv@xxxxxxxxxxxxx
- Date: Wed, 10 Dec 2008 22:02:21 +0100
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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