I believe this is the same issue that has been reported in ticket 2355: 

http://svn.mythtv.org/trac/ticket/2355

I applied the patch posted in that ticket and it solved my problems.

-b

On Tue, 2006-09-12 at 22:39 -0400, Jake Thompson wrote:
> When using the internal player to play dvd's on FC5 with Myth .20, I
> am seeing the following:
>  
> 2006-09-12 22:36:49.236 WriteAudio: buffer underrun
> 2006-09-12 22:36:49.888 WriteAudio: buffer underrun
> 2006-09-12 22:36:50.488 WriteAudio: buffer underrun
> 2006-09-12 22:36:51.092 WriteAudio: buffer underrun 
> 2006-09-12 22:36:51.680 WriteAudio: buffer underrun
> 2006-09-12 22:36:52.088 WriteAudio: buffer underrun
> 2006-09-12 22:36:52.888 WriteAudio: buffer underrun
>  
> Video seems to be playing smoothly, but the sound is "in and out".
>  
> The CPU seems to be sitting at about 11%, so it should not be a
> resources issue. 
>  
> My receiver seems to not see a steady audio stream, it keeps bliking
> on/off that there is digital input, in normal operation this is steady
> on weather or not there is "active" sound coming from the movie
> playing.
>  
> Thoughts?
>  
> -Jake
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