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

[Nasa]

Mike,

I have seen these *pauses* as well -- and you do a good job describing
it.  The only execpetion I have is that the pauses can be longer than
2 seconds(in some cases, much).  I haven't taken the time to troubleshoot
this and thus haven't put in a bug report.  

Thanks for hitting the list with this, it maybe more prevelant than 
just me :}

Nasa

----- "Michael Drons" <mdrons at yahoo.com> wrote:

> I see the same issue on my FE device.  I can't answer the issue either
> when asked.  I usually blam it on the video source switching from 480p
> to 720p (ie a commercial).  But I know it does it other times. 
> 
> I see the same ALSA errors.
> 
> I have not spent the time trying to determine the issue.  If you get
> anywhere or need additional data, please let me know as I am willing
> to provide debug/logs.
> 
> My FE/BE is trunk. 
> 
> Mike
> 
> 
> 
> 
> 
> 
> 
> From: Kenneth Emerson <kenneth.emerson at gmail.com>
> To: Discussion about mythtv <mythtv-users at mythtv.org>
> Sent: Thu, March 24, 2011 11:03:28 AM
> Subject: [mythtv-users] Playback problem -- random short pauses
> 
> I have been following several of the threads on this list (and the
> commit list) that have talked about "stuttering" during playback.  I
> don't believe that these issues are describing what I am seeing on my
> system.  My symptoms seem to have started happening about two months
> ago but I cannot pinpoint the time to some specific change in either
> my FE/BE combination or the version of mythTV.  I keep both my OS
> (Ubuntu 10.04 32 bit) and mythTV (24-fixes currently
> v0.24-227-gccd73be) up to date.  My version of NVIDIA driver is
> 260.19.21.  My system is based on an Intel Q6600 quad core 2.4GHz cpu.
>  The video being watched is primarily either 720p or 1080i material.
>  I don't believe I have ever seen the problem on 480 material, but
> that data set may be too small to matter.
> 
> 
> The specific problem I see during playback is a random, short pause
> with either missing frames or missing audio; hard to tell which.  The
> pause is very short (less than 2 seconds) but long enough to miss 1-3
> words of the dialog.  The video is not damaged since I can back up and
> replay the same segment without any interruption.  These pauses are
> random and occur anywhere from none in an hour-long show to four or
> five times in that period.  It is not related to the scheduler
> starting/stopping other recordings as I check my watch every time one
> occurs.  I do see a slight stutter, occasionally, when I know there
> are other recordings stopping/starting and that is a different and
> less annoying symptom.  I also limit the number of simultaneous jobs
> to two and I hold off commflagging until after the recordings have
> finished.  There appears to be nothing of interest in the frontend
> log.  I occasionally see "ALSA, Error: WriteAudio: buffer underrun"
> messages, but these do not seem to correlate to the pauses.
> 
> 
> I am looking for any ideas on how to proceed to troubleshoot this
> problem.  The WAF is not plummeting, but I do get the occasional,
> exasperated question "Why does it do that?" which, unfortunately, I
> cannot answer but desperately want to be able to.
> 
> 
> -- Ken E.
> 
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