Hello Andrew,
Andrew de Quincey wrote:
On Monday 22 May 2006 14:21, Johannes Stezenbach wrote:
On Mon, May 22, 2006, Klaus Schmidinger wrote:
Johannes Stezenbach wrote:
...
I also say it again: I am deeply dissatisfied that none
of the people you mentioned at the bottom of
http://linuxtv.org/pipermail/linux-dvb/2006-May/010076.html
seem to care enough to participate in the discussion.
(Not to mention that app developers also don't
seem to care -- after all these are the ones who'll have
to deal with the new API.)
Maybe we should just put the API change off for now. :-(
Well, as an application developer (VDR) I'd like to be able to
support DVB-S2, but I guess my knowledge about all this is too
limited to understand what this heated debate is all about.
I always thought that DVB-S2 is just "DVB-S with a new modulation",
IMHO the current use of DVB-S2 is just that, i.e. basically
the difference between the satellite_delivery_descriptor
as defined in EN 300 468 version 1.5.1 vs. 1.7.1.
(So it's actually not just a new modulation but also
the new roll-off factor.)
Current use of DVB-S2 to my knowledge is Premiere HD on Astra 19.2E.
If someone know other *current* uses of DVB-S2 please speak up.
Astra 28.2E has S2 streams. In the UK, nearly all of Sky's HDTV streams are
S2 - so its pretty obvious where they're heading with that.
I will check if the S2 descriptors are used in those NITs.
we have 2 modes.
(1) Normative Broadcast Mode (NBC-BS)
(2) Backward Compatible Mode
Only in Normative Broadcast Mode, we do have a S2 satellite delivery
system descriptor.
In the backwards compatible mode it is just DVB-S alone. There is only 1
stream in this case
The Backward compatible mode is just a time given for migration of STB's
to DVB-S2
Once this migration time is lapsed, they switch over to NBC-BS completely.
In the past we seem to have implemented API support for everything specced in
the standards. For example DVB-T hierarchies: has anyone ever seen those used
in a real system? Yet still we have support for them, so why should S2 be any
different?
I ask the same question.
And we can't predict unused features in DVBS2 from the lack of use of features
in DVBT, since satellite broadcasting is entirely different from terrestrial
broadcasting.
Manu
_______________________________________________
linux-dvb@xxxxxxxxxxx
http://www.linuxtv.org/cgi-bin/mailman/listinfo/linux-dvb
