Mailing List Archive: MythTV: Users

Can Myth TV record direct from DVB-T/DVB-T2

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rp.evans at tiscali

Nov 4, 2009, 6:15 PM

Post #1 of 9 (342 views)
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Can Myth TV record direct from DVB-T/DVB-T2

I hope this is a silly question.

I'm only at the stage of considering whether to build something using
Myth TV. I'm considering building a PVR, to record exclusively digital
TV transmission. Here in the UK digital TV used DVB-T, and soon some
DVB-T2 transmissions will be introduced, initially for HDTV. MythTv
looks like a good option, however the documentation only seems to talk
about using Analogue TV capture cards. I can't find anything about
recording digital TV.

Would I be correct in assuming that I could use some sort of DVB-T tuner
card, or even a DVB-T2, instead of analogue capture cards. This should
allow it to receive and record digital TV without any need to actually
encode any video, as the digital TV transmission are obviously already
encoded.

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simon at rumble

Nov 4, 2009, 6:34 PM

Post #2 of 9 (325 views)
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Re: Can Myth TV record direct from DVB-T/DVB-T2 [In reply to]

2009/11/5 Richard Evans <rp.evans[at]tiscali.co.uk>

> I'm only at the stage of considering whether to build something using Myth
> TV. I'm considering building a PVR, to record exclusively digital TV
> transmission. Here in the UK digital TV used DVB-T, and soon some DVB-T2
> transmissions will be introduced, initially for HDTV. MythTv looks like a
> good option, however the documentation only seems to talk about using
> Analogue TV capture cards. I can't find anything about recording digital TV.
>

http://www.mythtv.org/wiki/Category:Video_capture_cards

Yes, you can record DVB and store it without needing to do any video
encoding. You can record all the channels on a single multiplex (frequency,
roughly) at once using a single tuner.

> Would I be correct in assuming that I could use some sort of DVB-T tuner
> card, or even a DVB-T2, instead of analogue capture cards. This should allow
> it to receive and record digital TV without any need to actually encode any
> video, as the digital TV transmission are obviously already encoded.
>

Yes, and indeed that is the way most people outside North America use MythTV
these days.

No idea about DVB-T2. A quick glance at the Wikipedia article makes it
sound like some of the characteristics of the radio layer are changing,
which would mean existing DVB-T cards wouldn't work. In Australia we have
HDTV over DVB-T working just fine, but we don't have the massive number of
channels per multiplex that you have, generally only 2xSD 1xHD per
multiplex.

--
Simon Rumble <simon[at]rumble.net>

lindsay.mathieson at gmail

Nov 4, 2009, 6:40 PM

Post #3 of 9 (325 views)
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Re: Can Myth TV record direct from DVB-T/DVB-T2 [In reply to]

On Thu, 05 Nov 2009 02:15:34 +0000, Richard Evans <rp.evans[at]tiscali.co.uk>
wrote:
>
> Would I be correct in assuming that I could use some sort of DVB-T tuner

> card, or even a DVB-T2, instead of analogue capture cards. This should
> allow it to receive and record digital TV without any need to actually
> encode any video, as the digital TV transmission are obviously already
> encoded.

Absolutely correct for DVB-T, in fact that's all I do, I have 4 DVB-T
tuners and record FTA here in Oz. There are a wide range of cheap and
reliable PCI or USB DVB-T tuners compatible with MythTV.

Regards DVB-T2 - I don't know, not broadcast her in Oz. But I'm sure
someone for the UK will fill you in soon.

--
Lindsay Mathieson
http://blackpaw.jalbum.net/home/
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knowledgejunkie at gmail

Nov 5, 2009, 2:37 AM

Post #4 of 9 (313 views)
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Re: Can Myth TV record direct from DVB-T/DVB-T2 [In reply to]

2009/11/5 Lindsay Mathieson <lindsay.mathieson[at]gmail.com>:
> On Thu, 05 Nov 2009 02:15:34 +0000, Richard Evans <rp.evans[at]tiscali.co.uk>
> wrote:
>>
>> Would I be correct in assuming that I could use some sort of DVB-T tuner
>
>> card, or even a DVB-T2, instead of analogue capture cards. This should
>> allow it to receive and record digital TV without any need to actually
>> encode any video, as the digital TV transmission are obviously already
>> encoded.
>
> Absolutely correct for DVB-T, in fact that's all I do, I have 4 DVB-T
> tuners and record FTA here in Oz. There are a wide range of cheap and
> reliable PCI or USB DVB-T tuners compatible with MythTV.
>
> Regards DVB-T2 - I don't know, not broadcast her in Oz. But I'm sure
> someone for the UK will fill you in soon.

Like everyone else who bought an HD Ready iDTV[1], Freeview box, or
DVB-T card for their PC in the UK, you'll need to buy new DVB-T2
tuners in order to receive HDTV over digital terrestrial when
launched. I'm not aware of any supported DVB-T2 tuners on the market
at the moment. The LinuxTV wiki is worth bookmarking when researching
supported hardware [2]

Recording DVB-T/Freeview is really quite straightforward - after a
channel scan to find your available channels, MythTV can download the
programme guide broadcast over-the-air (so no internet connection
required for this [3]) and record simultaneously from as many tuners
as you have installed. You may quickly find you get recording
conflicts that multirec cannot handle [4], so I would strongly
recommend getting 2 physical DVB-T tuners.

Cheers,
Nick

[1] iDTVs with integrated Freesat can receive HD channels broadcast
over DVB-S (not involving MythTV), but you'll need DVB-S2 tuners when
channels move over to that (DVB-S2 cards are already available)
[2] http://www.linuxtv.org/wiki/index.php/Main_Page
[3] You can opt to use XMLTV instead to get your TV listings, but this
is currently more cumbersome to configure
[4] multirec allows MythTV to record simultaneously from a number of
channels broadcast on the same multiplex using a single physical tuner

--
Nick Morrott

MythTV Official wiki:
http://mythtv.org/wiki/
MythTV users list archive:
http://www.gossamer-threads.com/lists/mythtv/users

"An investment in knowledge always pays the best interest." - Benjamin Franklin
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fatgerman at ntlworld

Nov 5, 2009, 12:42 PM

Post #5 of 9 (296 views)
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Re: Can Myth TV record direct from DVB-T/DVB-T2 [In reply to]

On Thursday 05 Nov 2009 02:15:34 Richard Evans wrote:
> I hope this is a silly question.
>
> I'm only at the stage of considering whether to build something using
> Myth TV. I'm considering building a PVR, to record exclusively digital
> TV transmission. Here in the UK digital TV used DVB-T, and soon some
> DVB-T2 transmissions will be introduced, initially for HDTV. MythTv
> looks like a good option, however the documentation only seems to talk
> about using Analogue TV capture cards. I can't find anything about
> recording digital TV.
>
> Would I be correct in assuming that I could use some sort of DVB-T tuner
> card, or even a DVB-T2, instead of analogue capture cards. This should
> allow it to receive and record digital TV without any need to actually
> encode any video, as the digital TV transmission are obviously already
> encoded.

Yes I do exactly that, in the UK. I use two Hauppauge Nova-T USB2 tuners which are fully supported in Linux. No special configuration necessary.

I'm not aware of any current DVB-2 tuners but I'm sure that as soon as they become available, one of the many clever people out there will get to work writing drivers.

Mark

>
>
>
> _______________________________________________
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> mythtv-users[at]mythtv.org
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>
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anothersname at googlemail

Nov 5, 2009, 1:36 PM

Post #6 of 9 (296 views)
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Re: Can Myth TV record direct from DVB-T/DVB-T2 [In reply to]

2009/11/5 Richard Evans <rp.evans[at]tiscali.co.uk>:
> I hope this is a silly question.
>
> I'm only at the stage of considering whether to build something using Myth
> TV. I'm considering building a PVR, to record exclusively digital TV
> transmission. Here in the UK digital TV used DVB-T, and soon some DVB-T2
> transmissions will be introduced, initially for HDTV. MythTv looks like a
> good option, however the documentation only seems to talk about using
> Analogue TV capture cards. I can't find anything about recording digital TV.
>
> Would I be correct in assuming that I could use some sort of DVB-T tuner
> card, or even a DVB-T2, instead of analogue capture cards. This should allow
> it to receive and record digital TV without any need to actually encode any
> video, as the digital TV transmission are obviously already encoded.
>
>
>
> _______________________________________________
> mythtv-users mailing list
> mythtv-users[at]mythtv.org
> http://mythtv.org/cgi-bin/mailman/listinfo/mythtv-users
>

Richard

You may find this thread an interesting read.....

Regards
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nico at youplala

Nov 5, 2009, 1:53 PM

Post #7 of 9 (296 views)
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Re: Can Myth TV record direct from DVB-T/DVB-T2 [In reply to]

On Thu, 2009-11-05 at 21:36 +0000, Another Sillyname wrote:
> 2009/11/5 Richard Evans <rp.evans[at]tiscali.co.uk>:
> > I hope this is a silly question.
> >
> > I'm only at the stage of considering whether to build something
> using Myth
> > TV. I'm considering building a PVR, to record exclusively digital TV
> > transmission. Here in the UK digital TV used DVB-T, and soon some
> DVB-T2
> > transmissions will be introduced, initially for HDTV. MythTv looks
> like a
> > good option, however the documentation only seems to talk about
> using
> > Analogue TV capture cards. I can't find anything about recording
> digital TV.
> >
> > Would I be correct in assuming that I could use some sort of DVB-T
> tuner
> > card, or even a DVB-T2, instead of analogue capture cards. This
> should allow
> > it to receive and record digital TV without any need to actually
> encode any
> > video, as the digital TV transmission are obviously already encoded.
> >

I'm in the UK, I record only digital, Freeview (DVB-T) and satellite
(DVB-S, French channels not Freesat, but same technology) with MythTV.
We are a lot like that!

http://www.youplala.net/linux/home-theater-pc/

DVB-T2 is barely ratified as a standard, there is very little ready
silicon out there, and none on a PCI card, PCIe card or USB stick yet.
When it exists support should come in fairly quickly, the linux-media
guys (making the linux drivers) readied/are readying the framework for
that.

The wiki and docs talk a lot about analogue because it's been there for
a longer time and because digital is fairly easier.

Nico

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watkinshome at gmail

Nov 6, 2009, 12:51 AM

Post #8 of 9 (278 views)
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Re: Can Myth TV record direct from DVB-T/DVB-T2 [In reply to]

>
> You may find this thread an interesting read.....
>

Did you forget to attach the link, or did my mail reader remove it?
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anothersname at googlemail

Nov 6, 2009, 1:50 AM

Post #9 of 9 (276 views)
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Re: Can Myth TV record direct from DVB-T/DVB-T2 [In reply to]

2009/11/6 David Watkins <watkinshome[at]gmail.com>:
>>
>> You may find this thread an interesting read.....
>>
>
> Did you forget to attach the link, or did my mail reader remove it?
> _______________________________________________
> mythtv-users mailing list
> mythtv-users[at]mythtv.org
> http://mythtv.org/cgi-bin/mailman/listinfo/mythtv-users
>

I think I must have had a brain f*rt, thanks David

http://www.gossamer-threads.com/lists/mythtv/users/396017
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