[mythtv-users] tv playback woes

Thu Aug 18 15:32:05 UTC 2011

On Thu, Aug 18, 2011 at 7:25 AM, Chris Rouch <chris.rouch at gmail.com> wrote:

> On 17 August 2011 15:22, Chris Rouch <chris.rouch at gmail.com> wrote:
> > Over the last couple of weeks we've been experiencing regular, but
> > random freezes of the tv playback which end with the playback aborting
> > and a dialog being displayed (sorry I don't remember the exact
> > message). The frontend logs are full of messages like this:
> >
> >
> > 2011-08-14 21:36:47.182 Player(0): Waited 100ms for video buffers
> UUUAuAAUAAAUA
> > AUUAuAAAAULAAAAUAA
> > 2011-08-14 21:36:47.286 Player(0): Waited 100ms for video buffers
> UUUAuAAUAAAUA
> > AUUAuAAAAULAAAAUAA
> > 2011-08-14 21:36:47.296 Player(0): Waited 100ms for video buffers
> UUUAuAAUAAAUA
> > AUUAuAAAAULAAAAUAA
> > 2011-08-14 21:36:47.302 Player(0): Waited 100ms for video buffers
> UUUAuAAUAAAUA
> > AUUAuAAAAULAAAAUAA
> > 2011-08-14 21:36:47.313 Player(0): Waited 100ms for video buffers
> UUUAuAAUAAAUA
> > AUUAuAAAAULAAAAUAA
> > 2011-08-14 21:36:47.349 Player(0), Error: Waited too long for decoder to
> fill v
> > ideo buffers. Exiting..
> >
> >
> > The back end logs show nothing unusual happening at this time. This
> > happens if I nfs mount the directory from the backend or use myth's
> > internal protocol. If I then try to watch the same program again it
> > usually works normally.
> >
> > The backend is running centos5, latest rpms from atrpms.
> > The frontend is running mythbunto 10.10 with JYA's 0.24 repository.
> >
> > Does anyone have any idea how to debug this?
> >
> > Failing that, is it possible to roll back the frontend so that it has
> > an earlier version of myth 0.24? This was all working well a month ago
> > so anything before then would be worth trying. I've already rolled
> > back the rpms on the backend to 0.24.1-274, without any noticeable
> > difference.
> >
> > In case it matters, the front end is an acer revo with a "Intel(R)
> > Atom(TM) CPU  330   @ 1.60GHz" cpu, connected by hdmi. the playback
> > profile is CPU+ (VDPAU is available, but the resulting picture only
> > occupies the middle half of the screen, so is not really usable).
> >
> > Any help will be appreciated.
> >
> > Thanks,
> >
> > Chris
> >
>
> Some more info:
>
> The dialog box says "video frame buffering failed too many times".
>
> The backend isn't entirely normal. There are lots of entries like this
> (also when there are no playback problems):
>
>
> 2011-08-17 23:02:49.685 DB Error (delta position map insert):
> Query was:
> INSERT INTO recordedseek (chanid, starttime, mark, type, offset)
> VALUES ( ? , ? , ? , ? , ? )
> Bindings were:
> :CHANID=105, :MARK=114024, :OFFSET=2028720862,
> :STARTTIME=2011-08-17T21:30:00,
> :TYPE=9
> Driver error was [2/1062]:
> QMYSQL3: Unable to execute statement
> Database error was:
> Duplicate entry '105-2011-08-17 21:30:00-9-114024' for key 1
>
>
> and this (not many, but one co-incided with the playback problems):
>
>
> 2011-08-14 22:22:01.815 TFW, Error: Write() -- IOBOUND begin
> remaining(19281) free(0) size(2097152) cnt(1)
>
>
> and this coincided, though I expect it is normal:
>
> 2011-08-17 23:02:38.254 AutoExpire: Adding Programs to 'Do Not Expire' List
> 2011-08-17 23:02:38.256     105 at 2011-08-17T21:30:00 in use by
> recorder on sheedy
> 2011-08-17 23:02:38.256     1004 at 2011-08-04T02:25:00 in use by
> player on ratty
> 2011-08-17 23:02:38.257 AutoExpire: ExpireLiveTV(10000)
> 2011-08-17 23:02:38.257 AutoExpire: FillDBOrdered: Adding Short LiveTV
> programs
>  in starttime order
> 2011-08-17 23:02:38.271 AutoExpire: SendDeleteMessages. Nothing to expire.
>
>
> And last night, just before the "waited for video buffers" messages
> there was this in the front end logs:
>
>
> 2011-08-17 23:01:08.977 ALSA, Error: WriteAudio: buffer underrun
>
> Any help or suggestions will be really appreciated.
>
> Thanks,
>
> Chris
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>

For the backend errors I suggest you look at the wiki and perform a database
repair and optimization daily.
http://www.mythtv.org/wiki/User_Manual:Periodic_Maintenance#Optimize_the_Database

Have you tried any other profiles like Slim? Do you get the same results?

What exactly is the display difference between VDPAU and CPU+?  By
displaying only in the middle half of the screen do you mean you have black
bars on the left and right of the video??

The "video frame buffering failed too many times" gives me the impression
your backend is not able to feed data fast enough to your frontend.
-- 
Working on World Domination since 2001
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