[mythtv-users] NVP: prebuffering pause -- what does it mean, really?

Willy Boyd willyboyd at gmail.com
Fri Mar 16 19:38:35 UTC 2007

I should elaborate more, though:  I see occasional "prebuffering
pause" and "Prebuffer timed out" messages sometimes every few minutes,
but I could only tell from watching the log; It is only rarely now
that it visibly freezes the video.  The audio cuts out first, then
video freeze.  I can't confirm what cpu speed I was at during
"working" playback, but it's likely the throttle-back is when I get a
full on freeze.  Will also look into getting lm_sensors installed this
weekend to check temps.  I've already disable cpuspeed and asked the
wife at home to test LiveTV (or rather, let it play while she watches
cable :) ).

Thanks again,

On 3/16/07, Willy Boyd <willyboyd at gmail.com> wrote:
> You could be on to something.  I think I'm using cpuspeed by default
> (FC6 set it up that way I guess).  Maybe after a time period it
> throttles down thinking it can to reduce power, and this messes up the
> playback?  Something to try this weekend!  Thanks!
> On 3/16/07, James Armstrong <james at thearmstrongs.org> wrote:
> > On 3/16/2007 1:44 PM, Willy Boyd wrote:
> > > I'm just looking to understand this one.  At first I was going to post
> > > this to the -dev list, but figured I'd start here.  I'm hoping to get
> > > a better understanding of what the NVP: prebuffering pause message
> > > really means.
> > >
> > > Through trial and error, and lots of searching, I've reduced my issue
> > > significantly.  What started as video freezing very frequently,
> > > accompanied by prebuffering pause and "WriteAudio: buffer underrun"
> > > messages, is now only happening sometimes once per couple hours.  VERY
> > >
> > Something that would cause these (happened more than once for me) was
> > the cpu (pentium 4 hyperthreading) overheating and linux would throttle
> > down. At that point I would get prebuffer pauses. Used to drive me nuts
> > until I would remember from the previous time. That and using NFS share
> > to play vids instead of myth protocol.
> >
> > - James
> >
> >
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