[mythtv-users] Playback problem -- random short pauses
kenneth.emerson at gmail.com
Thu Mar 24 15:03:28 UTC 2011
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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