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<p class=MsoNormal>Hello. I am having a problem with severe “choppy”
audio when playing back recorded video on Totem and Mythtv. On Mythtv
when I play a recording for a while the chopping stops then the sound gets out
of sync, and rewinding restores the sync and copping. Mythtv log shows WriteAudio:
buffer underrun and repeated NVP(0): prebuffering pause errors.<o:p></o:p></p>
<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal>This is a FC12 box with Intel mobo that has Realtek ALC889A
sound hardware. Mythtv is using ALSA:front for the output. I don’t
know about Totem because I don’t see any way to configure the sound
output. <o:p></o:p></p>
<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal>Sound is fine when playing CDs on Rhythmbox. Sound is
also fine when I move one of the .mpg fles to a windoze box and play it there.
<o:p></o:p></p>
<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal>Per suggestions I found in various posts I set EXPERIMENTALLY_ALLOW_PULSE_AUDIO=1
in the environment variable so Mythtv doesn’t disable it. Have also
tried the various fixes/workarounds at <span style='color:#1F497D'><a
href="http://fedorasolved.org/Members/fenris02/pulseaudio-fixes-and-workarounds">http://fedorasolved.org/Members/fenris02/pulseaudio-fixes-and-workarounds</a>
and <a href="http://www.pulseaudio.org/wiki/PerfectSetup">http://www.pulseaudio.org/wiki/PerfectSetup</a>
and undone them because they didn’t help. <o:p></o:p></span></p>
<p class=MsoNormal><span style='color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='color:#1F497D'>My ALSA audio debug output is in
this post at Mythtv users <a
href="http://mythtv.org/pipermail/mythtv-users/2010-January/279355.html">http://mythtv.org/pipermail/mythtv-users/2010-January/279355.html</a>
in case that is helpful.<o:p></o:p></span></p>
<p class=MsoNormal><span style='color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='color:#1F497D'>I have researched this a lot and
tried a lot of fixes, and nothing seems to be working. I am kind of at
the end or my rope, so I’m hoping one of you audio wizards can suggest a
fix or debugging approach. Possibly this is not a Pulseaudio problem, but
even ruling that out would be very helpful.<o:p></o:p></span></p>
<p class=MsoNormal><span style='color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='color:#1F497D'>Many thanks in advance,<o:p></o:p></span></p>
<p class=MsoNormal><span style='color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='color:#1F497D'>Steve<o:p></o:p></span></p>
<p class=MsoNormal><span style='color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal><o:p> </o:p></p>
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