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Issue with Multirec and DVB-S?

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mail at benlancaster

Nov 1, 2009, 2:47 PM

Post #1 of 6 (533 views)
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Issue with Multirec and DVB-S?

Hi there,

I'm currently recording something on an HVR-4000 hybrid card using the
DVB-S tuner on ITV HD. When I launched Live TV, it started on BBC HD.
I thought this was a little strange as I only have a single DVB-S
tuner, and didn't realise that ITV HD or BBC HD were on the same
multiplex (if DVB-S even has multiplexes?), so I'd have expected
MythTV to switch to one of the DVB-T tuners on another card. I flicked
around a few other DVB-S channels and noticed that they were all
playing fine. So, I went in to my recordings and started watching the
DVB-S recording on ITV HD to find that the recording stopped working
at around the point I'd switched to Live TV - mythbackend still says
it's recording ITV HD (and it's still flagged as "currently recording"
in Watch Recordings) but it's impossible to play past the point that I
started watching Live TV, and the total time counter doesn't increase.
None of my other tuners were active at the time, only the DVB-S one.

Here's what mythfrontend logs at the point that it reaches the "end"
of the show that should be recording:

2009-11-01 22:42:42.911 NVP(i): prebuffering pause
2009-11-01 22:42:43.152 [h264_vdpau @ 0xb6c2d7c0]missing picture in
access unit
2009-11-01 22:42:43.152 [ac3 @ 0xb6c2d7c0]incomplete frame
2009-11-01 22:42:43.152 [ac3 @ 0xb6c2d7c0]invalid frame size
2009-11-01 22:42:43.170 [h264_vdpau @ 0xb6c2d7c0]missing picture in
access unit
2009-11-01 22:42:43.191 ~OpenGLVideoSync() -- closing opengl vsync
2009-11-01 22:42:43.305 Marking recording as unwatched
2009-11-01 22:42:43.305 TV: Attempting to change from Watching
WatchingRecording to None
2009-11-01 22:42:43.306 TV: Changing from Watching WatchingRecording
to None
2009-11-01 22:42:43.327 TV: Attempting to change from None to None

Is this a bug that needs reporting, or an issue with my setup? I do
have multirec set up on the DVB-S tuner, it looks like I probably
shouldn't, but surely MythTV shouldn't have allowed me to have
multirec setup on an input that doesn't support it?

Ben
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nick.rout at gmail

Nov 1, 2009, 3:22 PM

Post #2 of 6 (526 views)
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Re: Issue with Multirec and DVB-S? [In reply to]

On Mon, Nov 2, 2009 at 11:47 AM, Ben Lancaster <mail [at] benlancaster> wrote:
> Hi there,
>
> I'm currently recording something on an HVR-4000 hybrid card using the DVB-S
> tuner on ITV HD. When I launched Live TV, it started on BBC HD. I thought
> this was a little strange as I only have a single DVB-S tuner, and didn't
> realise that ITV HD or BBC HD were on the same multiplex (if DVB-S even has
> multiplexes?), so I'd have expected MythTV to switch to one of the DVB-T
> tuners on another card. I flicked around a few other DVB-S channels and
> noticed that they were all playing fine. So, I went in to my recordings and
> started watching the DVB-S recording on ITV HD to find that the recording
> stopped working at around the point I'd switched to Live TV - mythbackend
> still says it's recording ITV HD (and it's still flagged as "currently
> recording" in Watch Recordings) but it's impossible to play past the point
> that I started watching Live TV, and the total time counter doesn't
> increase. None of my other tuners were active at the time, only the DVB-S
> one.
>
> Here's what mythfrontend logs at the point that it reaches the "end" of the
> show that should be recording:
>
> 2009-11-01 22:42:42.911 NVP(i): prebuffering pause
> 2009-11-01 22:42:43.152 [h264_vdpau @ 0xb6c2d7c0]missing picture in access
> unit
> 2009-11-01 22:42:43.152 [ac3 @ 0xb6c2d7c0]incomplete frame
> 2009-11-01 22:42:43.152 [ac3 @ 0xb6c2d7c0]invalid frame size
> 2009-11-01 22:42:43.170 [h264_vdpau @ 0xb6c2d7c0]missing picture in access
> unit
> 2009-11-01 22:42:43.191 ~OpenGLVideoSync() -- closing opengl vsync
> 2009-11-01 22:42:43.305 Marking recording as unwatched
> 2009-11-01 22:42:43.305 TV: Attempting to change from Watching
> WatchingRecording to None
> 2009-11-01 22:42:43.306 TV: Changing from Watching WatchingRecording to None
> 2009-11-01 22:42:43.327 TV: Attempting to change from None to None
>
> Is this a bug that needs reporting, or an issue with my setup? I do have
> multirec set up on the DVB-S tuner, it looks like I probably shouldn't, but
> surely MythTV shouldn't have allowed me to have multirec setup on an input
> that doesn't support it?

I don't know the answer to your problem, but DVB-S certainly does
support multireac, and certainly does use multiplexes.
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knowledgejunkie at gmail

Nov 2, 2009, 7:16 PM

Post #3 of 6 (498 views)
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Re: Issue with Multirec and DVB-S? [In reply to]

2009/11/1 Ben Lancaster <mail [at] benlancaster>:
> Hi there,
>
> I'm currently recording something on an HVR-4000 hybrid card using the DVB-S
> tuner on ITV HD. When I launched Live TV, it started on BBC HD. I thought
> this was a little strange as I only have a single DVB-S tuner, and didn't
> realise that ITV HD or BBC HD were on the same multiplex (if DVB-S even has
> multiplexes?), so I'd have expected MythTV to switch to one of the DVB-T

BBC HD and ITV HD are actually on different satellites (Astra 2D and
Eurobird 1, respectively).

> tuners on another card. I flicked around a few other DVB-S channels and
> noticed that they were all playing fine. So, I went in to my recordings and
> started watching the DVB-S recording on ITV HD to find that the recording
> stopped working at around the point I'd switched to Live TV - mythbackend
> still says it's recording ITV HD (and it's still flagged as "currently
> recording" in Watch Recordings) but it's impossible to play past the point
> that I started watching Live TV, and the total time counter doesn't
> increase. None of my other tuners were active at the time, only the DVB-S
> one.

I think this may be an input group misconfiguration, but you'll need
an HVR-4000 user to give a definitive answer that this works.

The HVR-4000 cannot use DVB-S and DVB-T simultaneously, and this
restriction means that both the DVB-T and DVB-S inputs need to be
configured appropriately to stop MythTV from trying to use them both
at the same time. I don't have this card, but am guessing that
assigning them to the same input group would work.

An additional restriction when using multirec (much more useful on
DVB-T than DVB-S) is that each multirec-enabled card's inputs need to
be assigned to the same input group (this happens automatically if you
choose >1 recordings in capture card setup).

Whether the appropriate 'fix' is to assign *all* of the configured
card inputs on the HVR-4000 to the same input group (allowing the
scheduler or LiveTV session to handle inputs appropriately) is not for
me to say, but I'd give it a go :)

Cheers,
Nick

--
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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nick.rout at gmail

Nov 2, 2009, 7:33 PM

Post #4 of 6 (500 views)
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Re: Issue with Multirec and DVB-S? [In reply to]

On Tue, Nov 3, 2009 at 4:16 PM, Nick Morrott <knowledgejunkie [at] gmail> wrote:
.
>
> An additional restriction when using multirec (much more useful on
> DVB-T than DVB-S)

That is a very general statement! In my local market the opposite is
true (all of NZ Freeview is on 2 multiplexes on DVB-S at SD mpeg2
bitrates, whilst the DVB-T equivalent channels (mixed HD & SD at h264
rates) take 3 multiplexes.
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knowledgejunkie at gmail

Nov 2, 2009, 7:48 PM

Post #5 of 6 (497 views)
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Re: Issue with Multirec and DVB-S? [In reply to]

2009/11/3 Nick Rout <nick.rout [at] gmail>:
> On Tue, Nov 3, 2009 at 4:16 PM, Nick Morrott <knowledgejunkie [at] gmail> wrote:
> .
>>
>> An additional restriction when using multirec (much more useful on
>> DVB-T than DVB-S)
>
> That is a very general statement! In my local market the opposite is
> true (all of NZ Freeview is on 2 multiplexes on DVB-S at SD mpeg2
> bitrates, whilst the DVB-T equivalent channels (mixed HD & SD at h264
> rates) take 3 multiplexes.

Apologies - I clearly should have stated this was my opinion for the
UK's Freeview/Freesat services (although I am still envious about the
fact you only have 5 muxes *in total* :) ).

My current 0.22-fixes build has 98 muxes defined - 6 for DVB-T
(Freeview), and 92 for DVB-S (Freesat and other FTA channels on the
28.2E/28.5E Eurobird/Astra2 constellation).

Cheers,
Nick

--
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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nick.rout at gmail

Nov 3, 2009, 6:35 PM

Post #6 of 6 (468 views)
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Re: Issue with Multirec and DVB-S? [In reply to]

On Tue, Nov 3, 2009 at 4:48 PM, Nick Morrott <knowledgejunkie [at] gmail> wrote:
> 2009/11/3 Nick Rout <nick.rout [at] gmail>:
>> On Tue, Nov 3, 2009 at 4:16 PM, Nick Morrott <knowledgejunkie [at] gmail> wrote:
>> .
>>>
>>> An additional restriction when using multirec (much more useful on
>>> DVB-T than DVB-S)
>>
>> That is a very general statement! In my local market the opposite is
>> true (all of NZ Freeview is on 2 multiplexes on DVB-S at SD mpeg2
>> bitrates, whilst the DVB-T equivalent channels (mixed HD & SD at h264
>> rates) take 3 multiplexes.
>
> Apologies - I clearly should have stated this was my opinion for the
> UK's Freeview/Freesat services (although I am still envious about the
> fact you only have 5 muxes *in total* :) ).

But then again we only have about 12 stations! (and theres still
nothing to watch...)
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