[mythtv-users] Playback problem -- random short pauses

Kenneth Emerson kenneth.emerson at gmail.com
Tue May 3 04:29:22 UTC 2011


On Mon, May 2, 2011 at 2:16 PM, Taylor Ralph <taylor.ralph at gmail.com> wrote:

> On Tue, Apr 26, 2011 at 6:06 PM, Kenneth Emerson
> <kenneth.emerson at gmail.com> wrote:
> >>
> >> Did you apply the patch to the backend machine too?
> >>
> >> Regards
> >> --
> >> Taylor
> >>
> > My system is a combined frontend/backend, so yes the patch is in the
> backend
> > as well.
> > -- Ken E.
> >
>
> > What type of video hardware are you using and is it passively or
> > actively (ie, fan) cooled? Are you using VDPAU?
>
>
GEFORCE 9500 GT (1Gb RAM)
Fan cooled (nvclock shows GPU temperature around 47C)
Using VDPAU

>
> > The reason I ask is that thermal issues can cause the type of issues
> > that you describe. And it can all of a sudden start when it didn't
> > previously.
>
> I won't discount some kind of hardware issue.  I've seen stranger things,
but I would really like something definitive.  However, I have ordered a new
video board (ENGT430) which should arrive later this week.

One other thing I have noticed, and it might be another red herring, many of
the pauses occur within milliseconds of mythweather starting "Updates of
NWS-Alerts".  To verify this, I'll disable mythweather the next time we're
watching recordings and see if it makes a difference.  Below are two
examples from the frontend.log:

2011-05-02 21:41:48.358 Starting update of NWS-Alerts
'video_output' mean = '17205.53', std. dev. = '6915.81', fps = '58.12'
2011-05-02 21:41:48.617 Player(19): Waiting for video buffers...
2011-05-02 21:41:48.617 AO: Pause 1
2011-05-02 21:41:48.625 AO: OutputAudioLoop: audio paused
2011-05-02 21:41:48.625 ALSA, Error: WriteAudio: buffer underrun
2011-05-02 21:41:48.718 Player(19): Waited 100ms for video buffers
AAALAaAAAAAALAAAA
2011-05-02 21:41:48.720 Player(19): Waited 100ms for video buffers
AAALAaAAAAAALAAAA
2011-05-02 21:41:48.725 Player(19): Waited 100ms for video buffers
AAALAaAAAAAALAAAA
2011-05-02 21:41:48.727 Player(19): Waited 100ms for video buffers
AAALAaAAAAAALAAAA
2011-05-02 21:41:48.734 Player(19): Waited 100ms for video buffers
AAALAaAAAAAALAAAA
2011-05-02 21:41:48.736 Player(19): Waited 100ms for video buffers
AAALAaAAAAAALAAAA
2011-05-02 21:41:48.743 Player(19): Waited 100ms for video buffers
AAALAaAAAAAALAAAA
2011-05-02 21:41:48.800 AO: Pause 0
2011-05-02 21:41:48.824 AO: OutputAudioLoop: Play Event

and:

2011-05-02 21:31:48.322 Starting update of NWS-Alerts
2011-05-02 21:31:48.363 Player(19): Video is 3.18911 frames behind audio
(too slow), dropping frame to catch up.
2011-05-02 21:31:48.363 Player(19): Video is 3.53072 frames behind audio
(too slow), dropping frame to catch up.
2011-05-02 21:31:48.363 Player(19): Video is 3.53216 frames behind audio
(too slow), dropping frame to catch up.
2011-05-02 21:31:48.363 Player(19): Video is 3.29347 frames behind audio
(too slow), dropping frame to catch up.
2011-05-02 21:31:48.495 ALSA, Error: WriteAudio: buffer underrun


-- Ken E.
-------------- next part --------------
An HTML attachment was scrubbed...
URL: http://www.mythtv.org/pipermail/mythtv-users/attachments/20110502/e1bd4dd9/attachment-0001.html 


More information about the mythtv-users mailing list