Mailing List Archive: MythTV: Mythtvnz

Some channels missing while recording

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vance at juniper

May 14, 2009, 1:36 AM

Post #1 of 12 (2060 views)
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Some channels missing while recording

I have a Hauppauge Nova-S PCI card on Mythbuntu 9.04. I've noticed that when recording on Tuner 1 (Tuner 2 available) that a few channels go missing.

For example, TV3 and a few others are okay, but TV1 is missing. I can still see it in the programme guide, but can't find it when in Live TV mode - therefore can't switch to it.

However, if Tuner 2 is recording (and Tuner 1 is available), then all channels are available as you'd expect.

How do I confirm if I have both tuners set up correctly? Can I run some db queries to provide some more info?

Vance.
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nick.rout at gmail

May 14, 2009, 2:16 AM

Post #2 of 12 (1983 views)
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Re: Some channels missing while recording [In reply to]

On Thu, May 14, 2009 at 8:36 PM, Vance McIndoe <vance [at] juniper> wrote:
> I have a Hauppauge Nova-S PCI card on Mythbuntu 9.04. I've noticed that when recording on Tuner 1 (Tuner 2 available) that a few channels go missing.
>
> For example, TV3 and a few others are okay, but TV1 is missing. I can still see it in the programme guide, but can't find it when in Live TV mode - therefore can't switch to it.
>
> However, if Tuner 2 is recording (and Tuner 1 is available), then all channels are available as you'd expect.
>
> How do I confirm if I have both tuners set up correctly? Can I run some db queries to provide some more info?
>

I think what you are seeing is that the nova-s plus has only one real
tuner. It looks like 2 because you have multi-rec working.

What happens is that dvb is transmitted as multiple streams per
multiplex (or mux). ie several video streams and their accompanying
audio streams. one physical tuner can access all streams on a mux at
once. One physical tuner can be multiple virtual tuners, each virtual
tuner takes one channel (ie a video plus 1 or more audio) and presents
it for recording/watching.

The corollary is that if you are tuned to a channel on mux A on
virtual tuner 1, you can only get other channels on the same mux,
because the tuner can only access one mux at a time.

The good thing is satellite freeview only has two muxes, and two cards
will record all the TV you can get on satellite freeview. (I have each
card set up as 4 virtual tuners.)

You can see from http://www.lyngsat.com/optusd1.html what is on each
mux - basically all TVNZ plus MaoriTV on one mux and the rest on the
other.

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ross.jemima at gmail

May 15, 2009, 3:00 AM

Post #3 of 12 (1982 views)
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Re: Some channels missing while recording [In reply to]

>
> I think what you are seeing is that the nova-s plus has only one real
> tuner. It looks like 2 because you have multi-rec working.
>
> What happens is that dvb is transmitted as multiple streams per
> multiplex (or mux). ie several video streams and their accompanying
> audio streams. one physical tuner can access all streams on a mux at
> once. One physical tuner can be multiple virtual tuners, each virtual
> tuner takes one channel (ie a video plus 1 or more audio) and presents
> it for recording/watching.
>
> The corollary is that if you are tuned to a channel on mux A on
> virtual tuner 1, you can only get other channels on the same mux,
> because the tuner can only access one mux at a time.
>
> The good thing is satellite freeview only has two muxes, and two cards
> will record all the TV you can get on satellite freeview. (I have each
> card set up as 4 virtual tuners.)
>
>
Someone else was talking to me about doing something similar on a
Windows box (ie multiple virtual tuners). Is this possible for
FreeviewHD say on a Hauppauge T 500? Would be cool if I could split my
tuners again. Also how many muxes are there on the Terrestrial
broadcast? Is there a howto somewhere?

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mythtv at jagds

May 15, 2009, 5:00 AM

Post #4 of 12 (1975 views)
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Re: Some channels missing while recording [In reply to]

3 blocks

TVNZ 538000:
------------
TV ONE (720p Upscaled)
TV TWO (720p Upscaled)
TVNZ 6 (576i SD)
TVNZ 7 (576i SD)
TVNZ Sports extra (576i SD)

Mediaworks 570000:
------------------
TV 3 (1080i)
C4 (576i SD)
TV 3+1 (1080i)

Kordia 666000:
--------------
Parliament Tv (576i SD)
Maori Tv 4:3 with 16:9 flags (576i SD)
3KSD TVNZ Sports extra with MP2 Audio (576i SD)
4KSD
5KSD
6KSD
Radio NZ Concert
Radio NZ National
Freeview | HD

Yes Myth supports multiple virtual tuners - in the backend setup, Go to
Capture cards, for a DVB-T, select Recording Options, and set Max Recordings
here. If you set it to 5 you'll set 5 tuners in the System Status/ Tuner
Status.

-----Original Message-----
From: mythtvnz-bounces [at] lists
[mailto:mythtvnz-bounces [at] lists] On Behalf Of Ross and Jemima
Knudsen
Sent: Friday, May 15, 2009 10:01 PM
To: MythTV in NZ
Subject: Re: [mythtvnz] Some channels missing while recording

>
> I think what you are seeing is that the nova-s plus has only one real
> tuner. It looks like 2 because you have multi-rec working.
>
> What happens is that dvb is transmitted as multiple streams per
> multiplex (or mux). ie several video streams and their accompanying
> audio streams. one physical tuner can access all streams on a mux at
> once. One physical tuner can be multiple virtual tuners, each virtual
> tuner takes one channel (ie a video plus 1 or more audio) and presents
> it for recording/watching.
>
> The corollary is that if you are tuned to a channel on mux A on
> virtual tuner 1, you can only get other channels on the same mux,
> because the tuner can only access one mux at a time.
>
> The good thing is satellite freeview only has two muxes, and two cards
> will record all the TV you can get on satellite freeview. (I have each
> card set up as 4 virtual tuners.)
>
>
Someone else was talking to me about doing something similar on a
Windows box (ie multiple virtual tuners). Is this possible for
FreeviewHD say on a Hauppauge T 500? Would be cool if I could split my
tuners again. Also how many muxes are there on the Terrestrial
broadcast? Is there a howto somewhere?

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steven at openmedia

May 15, 2009, 3:28 PM

Post #5 of 12 (1945 views)
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Re: Some channels missing while recording [In reply to]

On 16/05/2009, at 12:00 AM, Geoff wrote:
>
>
> Yes Myth supports multiple virtual tuners - in the backend setup, Go
> to
> Capture cards, for a DVB-T, select Recording Options, and set Max
> Recordings
> here. If you set it to 5 you'll set 5 tuners in the System Status/
> Tuner
> Status.
>

Has anyone notice I/O issues with too many virtual tuners?

Whilst testing the max I've typically configured is 3 virtual tuners
per physical, and I've run upto 6 simultaneous recordings with a mix
of DTH and DTT.

How far have other people stressed multirec?

Steven Ellis - Technical Director
OpenMedia Limited
email - steven [at] openmedia
website - http://www.openmedia.co.nz

olivuts at yahoo

May 15, 2009, 4:17 PM

Post #6 of 12 (1947 views)
Permalink

Re: Some channels missing while recording [In reply to]

Has anyone notice I/O issues with too many virtual tuners?

Whilst testing the max I've typically configured is 3 virtual tuners per physical, and I've run upto 6 simultaneous recordings with a mix of DTH and DTT.

How far have other people stressed multirec?

Steven Ellis - Technical Director
OpenMedia Limited
email - steven [at] openmedia
website - http://www.openmedia.co.nz

I have done the same as you not more yet - ccan't really see much call for 7 or 8 recordings at the same time.
. I am wondering if I need to add another tuner so i can record say One, Three and Maori or Prime (when it gets added to Freeview).

hads at nice

May 15, 2009, 4:55 PM

Post #7 of 12 (1961 views)
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Re: Some channels missing while recording [In reply to]

On Sat, 2009-05-16 at 10:28 +1200, Steven Ellis wrote:
> How far have other people stressed multirec?

I've done about the same, 7 total, 6 on two DVB-S cards and one on a
PVR-150. You're running out of channels to record about there.

hads
--
http://nicegear.co.nz
New Zealands Open Source Hardware Supplier

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vance at juniper

May 15, 2009, 6:24 PM

Post #8 of 12 (1929 views)
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Re: Some channels missing while recording [In reply to]

I can see I'm going to have to buy a second DVB-S card.

----- Original Message -----
From: mythtvnz-bounces [at] lists <mythtvnz-bounces [at] lists>
To: MythTV in NZ <mythtvnz [at] lists>
Sent: Sat May 16 07:55:59 2009
Subject: Re: [mythtvnz] Some channels missing while recording

On Sat, 2009-05-16 at 10:28 +1200, Steven Ellis wrote:
> How far have other people stressed multirec?

I've done about the same, 7 total, 6 on two DVB-S cards and one on a
PVR-150. You're running out of channels to record about there.

hads
--
http://nicegear.co.nz
New Zealands Open Source Hardware Supplier

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sam at samborambo

May 16, 2009, 7:36 PM

Post #9 of 12 (1915 views)
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Re: Some channels missing while recording [In reply to]

> On Sat, 2009-05-16 at 10:28 +1200, Steven Ellis wrote:
>> How far have other people stressed multirec?
>
> I've done about the same, 7 total, 6 on two DVB-S cards and one on a
> PVR-150. You're running out of channels to record about there.
>
> hads
> --
> http://nicegear.co.nz
> New Zealands Open Source Hardware Supplier
>

I've done 10 simultaneous recordings on my two SkyStar 2 DVB-S cards before
for a stress test. No problems whatsoever. CPU usage was fairly low if I
recall correctly.

Another thread hijack: I'm working on getting a DM1105 DVB-S card running.
They are the cards that are advertised on trademe for $69. There's support
for DM1105 in Jaunty but I need to add the PCI IDs for this card. I'll post
again once I have this working.

Once that card is in the backend, I'll run a stress test again with 15
channels if the transponder split works out right (ie: 10 on TVNZ and 5 on
Canwest/Mediaworks). I suppose including the radio channels isn't much of a
test with their low bitrates.

We could just modify the backend code to support, say, 10 virtual tuners
per device. To anyone who has a good understanding of mythtv's source,
would that be hard?

Sam.

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david at thistledown

May 18, 2009, 1:23 AM

Post #10 of 12 (1889 views)
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Re: Some channels missing while recording [In reply to]

On Sat, May 16, 2009 at 11:17 AM, Steve V <olivuts [at] yahoo> wrote:

> I am wondering if I need to add another tuner so i can record say One,
> Three and Maori or Prime (when it gets added to Freeview).
>
>
> Hijack again - is that comment about Prime wishful thinking or a real plan?

- David

simon at simongreen

May 18, 2009, 1:30 AM

Post #11 of 12 (1888 views)
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Re: Some channels missing while recording [In reply to]

2009/5/18 David Lowe <david [at] thistledown>:
>
> On Sat, May 16, 2009 at 11:17 AM, Steve V <olivuts [at] yahoo> wrote:
>>
>> I am wondering if I need to add another tuner so i can record say One,
>> Three and Maori or Prime (when it gets added to Freeview).
>>
>>
> Hijack again - is that comment about Prime wishful thinking or a real plan?

Wishful thinking going by today's media reports:

http://www.stuff.co.nz/business/industries/telecoms-it-media/2419341/Sky-TV-refuses-to-budge-on-Prime

"Broadcasting Minister Jonathan Coleman appears to have failed in his
bid to encourage Sky Television to make Prime available on Freeview."

-- simon

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killerkiwi2005 at gmail

May 18, 2009, 1:49 PM

Post #12 of 12 (1878 views)
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Re: Some channels missing while recording [In reply to]

I would say sky will hold out till the day analogue is switched off...

2009/5/18 Simon Green <simon [at] simongreen>

> 2009/5/18 David Lowe <david [at] thistledown>:
> >
> > On Sat, May 16, 2009 at 11:17 AM, Steve V <olivuts [at] yahoo> wrote:
> >>
> >> I am wondering if I need to add another tuner so i can record say One,
> >> Three and Maori or Prime (when it gets added to Freeview).
> >>
> >>
> > Hijack again - is that comment about Prime wishful thinking or a real
> plan?
>
> Wishful thinking going by today's media reports:
>
>
> http://www.stuff.co.nz/business/industries/telecoms-it-media/2419341/Sky-TV-refuses-to-budge-on-Prime
>
> "Broadcasting Minister Jonathan Coleman appears to have failed in his
> bid to encourage Sky Television to make Prime available on Freeview."
>
> -- simon
>
> _______________________________________________
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>

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