[mythtv-users] WriteAudio: buffer underruns without prebuffering pauses (SOLVED - almost)

[Steven Adeff]

On 2/23/07, Tom Greer <trgreer at gmail.com> wrote:
> adeffs.mythtv at gmail wrote:
> > make sure your NVAGP setting is back to the default, and disable the
> > Aggressive sound card buffering (the regular extra audio buffering
> > should be enough).
> >
> > What CPU do you have?
>
> When you get the prebuffer pauses do you notice
> > a large spike in CPU? or is it steadily high with the occasional jump
> > (like a 90% steady with a blip higher during a scene change or high
> > motion)?
>
> Steve,
>
> Thanks for your support on this.
>
> I've reset my NVAGP setting back to "2"; but tonight I'll comment out
> this line in my xorg.conf file.
>
> Aggressive sound card buffering is already off.
>
> Extra audio buffering is also off.  I'll turn it back on for my testing tonight.
>
> My CPU?   cat /proc/cpuinfo reports: AMD Sempron(tm) Processor 2600+.
>
> Side commentary:  I originally built this box for a standard
> definition TV.  I never expected to be able to get this CPU to be able
> to drive HDTV without XVMC.  But now I am so close, it's become an
> obsession.
>
> Did I see a spike in CPU usage, like during a scene change?  I was
> flipping back and forth to a window running top to monitor the CPU
> load.  I did not notice any spikes.  Tonight I will run "vmstat 1"
> which will provide a log containing the CPU load in one second
> intervals.  That should catch any spikes.

I don't see any way that processor will do 1080i without XvMC, just
not enough horses under the hood. You can try overclocking it, though
I don't know if you will be able to get it fast enough.

-- 
Steve
Before you ask, read the FAQ!
http://www.mythtv.org/wiki/index.php/Frequently_Asked_Questions
then search the Wiki, and this list,
http://www.gossamer-threads.com/lists/mythtv/
Mailinglist etiquette -
http://www.mythtv.org/wiki/index.php/Mailing_List_etiquette