[mythtv-users] Help wanted with mixed SD/HD Setup (DVB-S, Astra 19.2°)

[alex at apics.co.uk]

mythtv-users-bounces at mythtv.org wrote on 24/01/2010 20:23:42:

> From: Matthias Thyroff <nospam2 at thyroff.net>
> To: Discussion about mythtv <mythtv-users at mythtv.org>
> Date: 24/01/2010 20:24
> Subject: Re: [mythtv-users] Help wanted with mixed SD/HD Setup (DVB-
> S, Astra 19.2°)
> Sent by: mythtv-users-bounces at mythtv.org
> 
> Another Sillyname wrote:
> > 2010/1/24 R. G. Newbury <newbury at mandamus.org>:
> > 
> >> On 01/24/2010 06:40 AM, Matthias Thyroff wrote:
> >> 
> >>> Hello All,
> >>>
> >>> being right in the process of reconfiguring my 0.22 myth system from
> >>> scratch, I am not sure how to handle the channel setup for my mixed
> >>> SD/HD setup, I hope you can set me on the right track:
> >>>
> >>> Setup:
> >>> Myth Backend (Ubuntu 9.10, mythbuntu repositories for 0.22-fixes 
weekly
> >>> builds)
> >>> with 1x Technisat DVB-S SD receiver and 1x Hauppauge DVB-S2 HD 
receiver,
> >>> both pointing to Astra 19.2°E.
> >>> Video Source: EPGDATA commercial service (XMLTV).
> >>>
> >>> I have configured EPGDATA as source 1. I have linked both cards to 
this
> >>> source.
> >>> 
> >> Yes, this approach is wrong. You match cards to sources, where any 
card on
> >> the source can tune ALL of the channels from that source. Your cards 
cannot
> >> do that.
> >> You need to set up 2 sources even though they are pointed at the 
> same actual
> >> transmitter. One source for SD, and one source for HD. That way the
> >> Hauppuage tuner is the only one which gets presented with HD 
channels.
> >>
> >> 
> >>> If I scan the channels with the DVB-S2 card, it will find a lot of 
SD
> >>> channels and some HD channels.
> >>>
> >>> All the found channels then are available for tuning for both cards, 
of
> >>> course this fails if I try to do that with the SD-only card.
> >>>
> >>> I would not like to set up two video sources (one SD only, one SD 
and
> >>> HD) because downloading two times ... most importantly, does not 
seem to
> >>> be the right way (I could name technical reasons, too.)
> >>> 
> >> It is actually the correct way. If the HD receiver can also receive 
the SD
> >> channels, then it will be a larger list of channels. If not you will 
have 2
> >> mutually distinct channel lists.
> >>
> >> 
> >>> I have tried to set up one additional video source for the few HD
> >>> channels only and limit the source to EIT data, that would be 
acceptable
> >>> for now (German HD channels aren't reproduced properly anyway in the
> >>> actual 0.22-fixes version from the mythbuntu repo), but I can't find 
a
> >>> way to attach two video sources to one card.
> >>> 
> >> That is not possible, due to the constraint that a tuner attached to 
a
> >> source must be able to tune all of the channels in that source.
> >>
> >> 
> >>> Basically, what I would need is the possibility to exclude a number 
of
> >>> channels from being tuned with one of my cards. Is that possible? 
Maybe
> >>> my approach is all wrong?
> >>> 
> >> You will have to set up 2 lineups. It should not be that hard with 
XMLTV.
> >> The overall download should not be that any larger being split into 2
> >> chunks. Only if the HD receiver also gets the SD channels, AND your 
xmltv
> >> program does NOT cache data, would the download be any bigger. The 
xmltv
> >> program used by mythtv for Schedules Direct caches data for re-use. 
Your
> >> version probably does too.
> >>
> >> Geoff
> >>
> >>
> >>
> >> --
> >>        Please let me know if anything I say offends you.
> >>         I may wish to offend you again in the future.
> >>
> >>         Tux says: "Be regular. Eat cron flakes."
> >>
> >> _______________________________________________
> >> mythtv-users mailing list
> >> mythtv-users at mythtv.org
> >> http://mythtv.org/cgi-bin/mailman/listinfo/mythtv-users
> >>
> >> 
> >
> > Also be aware that sometimes your cards will load in different order
> > unless you force the load order.  It's to do with how quickly the
> > firmware loads into a card and then that card gets presented to the
> > kernel sooner.  Hot reboot and Cold Reboot affects the firmware
> > loading time.
> > _______________________________________________
> > mythtv-users mailing list
> > mythtv-users at mythtv.org
> > http://mythtv.org/cgi-bin/mailman/listinfo/mythtv-users
> > 
> Hi,
> 
> and thanks for both replies. I was afraid I had to create two lineups, 
> that is a pitty because it is going to be two times exactly the same 
> lineup, once with four additional HD channels of which three are the HD 
> version of other available channels. My feeling is that the EPGDATA 
> script does not do caching, well I will see.
> 
> Regarding the device order, surprisingly it seems that the DVB-S 
> Technisat very consitently is the first one up - that is good because I 
> never got the UDEV-Rule writing right, I have to admit. Before, I was 
> blacklisting and rc.local-loading a second card, but I did not find out 
> how to blacklist the Hauppauge properly (actually, I got it blacklisted, 

> but when manually loading the module, the dvb device would not be 
> created, I don't know why). But that works anyway.

In case it is of any help, I couldn't get udev to do the job, so I wrote a 
script to force the order of the cards...
As luck would have it I just put it on the wiki today...

http://www.mythtv.org/wiki/Force_DVB_Card_Order

Note: I know its very much not the 'correct' way to do it, but works 100% 
for me..... (better than can be said for udev!)

> 
> OK, some more channel scanning then, I am getting more and more 
practice!
> 
> Cheers,
> 
> Matthias
> _______________________________________________
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> mythtv-users at mythtv.org
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Alex

alex at apics.co.uk

Homer Simpson: Facts are meaningless. You could use facts to prove 
anything that's even remotely true!

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