Mailing List Archive: MythTV: Users

HD playback on Myth, 0-23-fixes

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liam.friel at gmail

Sep 5, 2010, 4:16 AM

Post #1 of 10 (562 views)
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HD playback on Myth, 0-23-fixes

Hi,

bit of an issue and wondering where to start looking.

I had some trouble with Myth 0.22 on Ubuntu 9.10 (not working nicely with
HVR4000 card for DVB-T)

These troubles were fixed by upgrading to 0-23-fixes branch (which I built
locally from source).

Now I have the backend working nicely, unified DVB-T and DVB-S/S2 services:
apart from one issue.

HD (I am in Ireland, so BBC-HD and ITV HD available on satellite) does not
playback nicely, either live tv on the frontend, or playing back a recording
on the frontend.

I get lots of "NVP: prebuffering pause" messages.

The frontend is an Atom 330 based system, VDPAU available etc. Frontend is
on GBIt wired network from backend.

The frontend is used to run XBMC mainly, and XBMC (9.11 release) will
browse/play Myth recordings fine via UPnP. Myth HD recordings streamed from
the backend to XBMC playback (almost) perfectly - there are some very brief
audio dropouts from time to time. But entirely watchable.

Myth HD recordings or live TV will not play at all properly in a
mythfrontend running on the same machine: you get 2 seconds of AV, then 2
seconds pause for "prebuffering", etc.

So the recordings are fine, but frontend won't play them back nicely.

Any troubleshooting hints?

Ta
Liam

dave at altosdesign

Sep 5, 2010, 7:58 AM

Post #2 of 10 (548 views)
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Re: HD playback on Myth, 0-23-fixes [In reply to]

On Sun, Sep 5, 2010, 4:16 AM, liam.friel at gmail wrote:
> Any troubleshooting hints?

http://www.mythtv.org/wiki/Troubleshooting:Prebuffering_pause

Hope that helps...

Dave

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liam.friel at gmail

Sep 5, 2010, 1:46 PM

Post #3 of 10 (534 views)
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Re: HD playback on Myth, 0-23-fixes [In reply to]

Hi Dave,

thanks for that. I had found it ... but I don't think anything on that list
applies to my situation ...

I will take a closer look though ...

Liam

On Sun, Sep 5, 2010 at 3:58 PM, David Lasker <dave [at] altosdesign> wrote:

> On Sun, Sep 5, 2010, 4:16 AM, liam.friel at gmail wrote:
> > Any troubleshooting hints?
>
> http://www.mythtv.org/wiki/Troubleshooting:Prebuffering_pause
>
> Hope that helps...
>
> Dave
>
> _______________________________________________
> mythtv-users mailing list
> mythtv-users [at] mythtv
> http://mythtv.org/cgi-bin/mailman/listinfo/mythtv-users
>

tortise at paradise

Sep 5, 2010, 2:30 PM

Post #4 of 10 (535 views)
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Re: HD playback on Myth, 0-23-fixes [In reply to]

----- Original Message -----
From: Liam Friel
To: Discussion about MythTV
Sent: Monday, September 06, 2010 8:46 AM
Subject: Re: [mythtv-users] HD playback on Myth, 0-23-fixes

On Sun, Sep 5, 2010 at 3:58 PM, David Lasker <dave [at] altosdesign> wrote:

On Sun, Sep 5, 2010, 4:16 AM, liam.friel at gmail wrote:
> Any troubleshooting hints?

>http://www.mythtv.org/wiki/Troubleshooting:Prebuffering_pause

Another suspected cause is incompatible motherboard chipsets, see the NVIDIA docos and the NVIDIA forums. Sounds like a recent FE
motherboard though, so less likely to be the explanation, but worth checking out still. Some more information might help, such as
have you turned compositing off? Component model numbers? What you have done on the FE, I expect the problem is likely to be a FE
problem.

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liam.friel at gmail

Sep 5, 2010, 2:47 PM

Post #5 of 10 (534 views)
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Re: HD playback on Myth, 0-23-fixes [In reply to]

Hi,

I have an Acer Revo 3610, about 6 months old. It has dual-core Atom 330 with
NVIDIA ION chipset of some recent vintage ... according to the forums (I
think) this should work fine.

I confess to not having checked the gory details, since I am not super
familiar with the myth frontend ... I was happily using only the xbmc
frontend with the myth backend, until I embarked recently on trying to get
DVB-T working ... this was with the standard Ubuntu binary install which is
currently myth 0.22

Nor did I pay huge attention when building the 0-23-fixes branch. I took
defaults for everything.

On the frontend, I have tried all variants (on the UI) of Playback setting
for VDPAU and one or two of the non-VDPAU settings. None of these seem to
make any obvious difference to my playback troubles.

I am sure you're right and it's just a FE issue since recordings will both
playback in XBMC, and play find in XBMC when streamed by the myth backend...
but I don't yet know what bits of it to tweak on the UI (or when building)
to make this go away ...

On Sun, Sep 5, 2010 at 10:30 PM, Tortise <tortise [at] paradise> wrote:

> ----- Original Message ----- From: Liam Friel
> To: Discussion about MythTV
> Sent: Monday, September 06, 2010 8:46 AM
> Subject: Re: [mythtv-users] HD playback on Myth, 0-23-fixes
>
>
> On Sun, Sep 5, 2010 at 3:58 PM, David Lasker <dave [at] altosdesign> wrote:
>
> On Sun, Sep 5, 2010, 4:16 AM, liam.friel at gmail wrote:
>
>> Any troubleshooting hints?
>>
>
> http://www.mythtv.org/wiki/Troubleshooting:Prebuffering_pause
>>
>
> Another suspected cause is incompatible motherboard chipsets, see the
> NVIDIA docos and the NVIDIA forums. Sounds like a recent FE motherboard
> though, so less likely to be the explanation, but worth checking out still.
> Some more information might help, such as have you turned compositing off?
> Component model numbers? What you have done on the FE, I expect the
> problem is likely to be a FE problem.
> _______________________________________________
> mythtv-users mailing list
> mythtv-users [at] mythtv
> http://mythtv.org/cgi-bin/mailman/listinfo/mythtv-users
>

kevin at familyross

Sep 7, 2010, 9:21 PM

Post #6 of 10 (503 views)
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Re: HD playback on Myth, 0-23-fixes [In reply to]

On 9/5/2010 2:47 PM, Liam Friel wrote:
> Hi,
>
> I have an Acer Revo 3610, about 6 months old. It has dual-core Atom
> 330 with NVIDIA ION chipset of some recent vintage ... according to
> the forums (I think) this should work fine.
>
> I confess to not having checked the gory details, since I am not super
> familiar with the myth frontend ... I was happily using only the xbmc
> frontend with the myth backend, until I embarked recently on trying to
> get DVB-T working ... this was with the standard Ubuntu binary install
> which is currently myth 0.22
>
> Nor did I pay huge attention when building the 0-23-fixes branch. I
> took defaults for everything.
>
> On the frontend, I have tried all variants (on the UI) of Playback
> setting for VDPAU and one or two of the non-VDPAU settings. None of
> these seem to make any obvious difference to my playback troubles.
>
> I am sure you're right and it's just a FE issue since recordings will
> both playback in XBMC, and play find in XBMC when streamed by the myth
> backend... but I don't yet know what bits of it to tweak on the UI (or
> when building) to make this go away ...
>

As Tortise suggested, make sure compositing is turned off. You can edit
your xorg.conf by hand, but it's easier to just run:

sudo nvidia-xconfig --no-composite

and then restart X.

_______________________________________________
mythtv-users mailing list
mythtv-users [at] mythtv
http://mythtv.org/cgi-bin/mailman/listinfo/mythtv-users

liam.friel at gmail

Sep 8, 2010, 1:20 AM

Post #7 of 10 (501 views)
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Re: HD playback on Myth, 0-23-fixes [In reply to]

I'll try that thanks ... was distracted there recently by some networking
issues but will check it this evening

On Wed, Sep 8, 2010 at 5:21 AM, Kevin Ross <kevin [at] familyross> wrote:

> On 9/5/2010 2:47 PM, Liam Friel wrote:
>
>> Hi,
>>
>> I have an Acer Revo 3610, about 6 months old. It has dual-core Atom 330
>> with NVIDIA ION chipset of some recent vintage ... according to the forums
>> (I think) this should work fine.
>>
>> I confess to not having checked the gory details, since I am not super
>> familiar with the myth frontend ... I was happily using only the xbmc
>> frontend with the myth backend, until I embarked recently on trying to get
>> DVB-T working ... this was with the standard Ubuntu binary install which is
>> currently myth 0.22
>>
>> Nor did I pay huge attention when building the 0-23-fixes branch. I took
>> defaults for everything.
>>
>> On the frontend, I have tried all variants (on the UI) of Playback setting
>> for VDPAU and one or two of the non-VDPAU settings. None of these seem to
>> make any obvious difference to my playback troubles.
>>
>> I am sure you're right and it's just a FE issue since recordings will both
>> playback in XBMC, and play find in XBMC when streamed by the myth backend...
>> but I don't yet know what bits of it to tweak on the UI (or when building)
>> to make this go away ...
>>
>>
> As Tortise suggested, make sure compositing is turned off. You can edit
> your xorg.conf by hand, but it's easier to just run:
>
> sudo nvidia-xconfig --no-composite
>
> and then restart X.
>
>
> _______________________________________________
> mythtv-users mailing list
> mythtv-users [at] mythtv
> http://mythtv.org/cgi-bin/mailman/listinfo/mythtv-users
>

george.poulson at gmail

Sep 8, 2010, 1:29 AM

Post #8 of 10 (497 views)
Permalink

Re: HD playback on Myth, 0-23-fixes [In reply to]

On 8 September 2010 09:20, Liam Friel <liam.friel [at] gmail> wrote:

> I'll try that thanks ... was distracted there recently by some networking
> issues but will check it this evening
>
>
Sorry if thai has already been mentioned but I've onlyjust joined the list.

Check in the Revo BIOS how much memory you have assigned to video.

Most systems default to a very low value; for HD playback and VDPAU you will
need to wind it all the way up to 512MB.

George

liam.friel at gmail

Sep 8, 2010, 1:32 AM

Post #9 of 10 (496 views)
Permalink

Re: HD playback on Myth, 0-23-fixes [In reply to]

Yep I have that already.
XBMC VDPAU playback is perfect (including on myth recordings which won't
playback in the myth frontend).

On Wed, Sep 8, 2010 at 9:29 AM, George Poulson <george.poulson [at] gmail>wrote:

> On 8 September 2010 09:20, Liam Friel <liam.friel [at] gmail> wrote:
>
>> I'll try that thanks ... was distracted there recently by some networking
>> issues but will check it this evening
>>
>>
> Sorry if thai has already been mentioned but I've onlyjust joined the list.
>
> Check in the Revo BIOS how much memory you have assigned to video.
>
> Most systems default to a very low value; for HD playback and VDPAU you
> will need to wind it all the way up to 512MB.
>
> George
>
>
> _______________________________________________
> mythtv-users mailing list
> mythtv-users [at] mythtv
> http://mythtv.org/cgi-bin/mailman/listinfo/mythtv-users
>
>

liam.friel at gmail

Sep 9, 2010, 5:33 AM

Post #10 of 10 (454 views)
Permalink

Re: HD playback on Myth, 0-23-fixes [In reply to]

Checked last night: composite was turned off already ...

On Wed, Sep 8, 2010 at 5:21 AM, Kevin Ross <kevin [at] familyross> wrote:

>
>
> As Tortise suggested, make sure compositing is turned off. You can edit
> your xorg.conf by hand, but it's easier to just run:
>
> sudo nvidia-xconfig --no-composite
>
> and then restart X.
>
>
> _______________________________________________
> mythtv-users mailing list
> mythtv-users [at] mythtv
> http://mythtv.org/cgi-bin/mailman/listinfo/mythtv-users
>

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