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

[Michael Drons]

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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