<html><head><style type="text/css"><!-- DIV {margin:0px;} --></style></head><body><div style="font-family:times new roman,new york,times,serif;font-size:12pt">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. <br><br>I see the same ALSA errors.<br><br>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.<br><br>My FE/BE is trunk. <br><br>Mike<br><div><br></div><blockquote style="border-left: 2px solid rgb(16, 16, 255); margin-left: 5px; padding-left: 5px;"><div style="font-family: times new roman,new york,times,serif; font-size: 12pt;"><br><div style="font-family: times new roman,new york,times,serif; font-size: 12pt;"><font face="Tahoma" size="2"><b><span
style="font-weight: bold;">From:</span></b> Kenneth Emerson <kenneth.emerson@gmail.com><br><b><span style="font-weight: bold;">To:</span></b> Discussion about mythtv <mythtv-users@mythtv.org><br><b><span style="font-weight: bold;">Sent:</span></b> Thu, March 24, 2011 11:03:28 AM<br><b><span style="font-weight: bold;">Subject:</span></b> [mythtv-users] Playback problem -- random short pauses<br></font><br>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.<div>
<br></div><div>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.</div>
<div><br></div><div>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.</div>
<div><br></div><div>-- Ken E.</div>
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