[mythtv-users] sound buffers

Nick Rout nick at rout.co.nz
Mon Jun 27 23:56:39 UTC 2005


Thanks Nick, I'll look further tonight


On Tue, 28 Jun 2005 00:53:31 +0100
Nick wrote:


> On 6/28/05, Nick Rout <nick at rout.co.nz> wrote:
> > I am having stutter problems with livetv.

> > Crawling through the list archives, along with the reference to audio in
> > the verbose output, leads me to believe this is an audio issue. However
> > i am not sure where to go from here. Options seem to be:
> > 
> > *use alsa instead of the oss/alsa emulation - but I have seen list posts
> > that claim the alsa support in myth is crap and to be avoided
> 
> Not true.
> 
> > *find some way of giving the sound driver (or the oss emulation layer)
> > more buffering space - how would I do this?
> 
> Options in frontend setup.
> 
> > 
> > *try the independent alsa drivers instead of what is in the kernel
> 
> Easily doable - download the drivers, lib and utils archives from
> alsa-project.org.
> 
> > Any suggestions would be gratefully received.
> 
> Frontend setup allows you to use aggressive soundcard buffering
> (general setup) and another audio buffering setting in TV settings.
> 
> You could check whether using ALSA devices (you may have OSS emulation
> running, using /dev/dsp and /dev/mixer) makaes things better.
> ALSA:default and default are the typical equivalent devices to use. I
> don't have any problems with ALSA at all, other than the fact that
> mythmusic still uses OSS.
> 
> The one time I have had audio issues was on my Pentium M laptop (over
> wireless g), when I had borked the powersave options and throttled the
> CPU too low when unplugged. Setting the throttling to a more sensible
> level cured all the problems. I had at the time already installed ALSA
> 1.0.9b, but another system using 1.0.8 is also fine.
> 
> I'd also look into running the frontend with root privileges to get
> better performance and access to real-time threading, which may
> improve performance.
> 
> HTH,
> Nick
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-- 
Nick Rout



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