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

Matthias Thyroff nospam2 at thyroff.net
Sun Jan 24 20:23:42 UTC 2010


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."
>>
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>>
>>     
>
> 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.
> _______________________________________________
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> 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.

OK, some more channel scanning then, I am getting more and more practice!

Cheers,

Matthias


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