[clug] alsa config for MythTV (spdif)

Paul mylists at wilsononline.id.au
Tue Jan 5 00:23:41 MST 2010

On 5/01/2010 6:17 PM, Jeff Stiff wrote:
> 2010/1/5 Paul <mylists at wilsononline.id.au
> <mailto:mylists at wilsononline.id.au>>
>     In the last few months even after upgrading MythTV and Fedora
>     (currnetly 12), I have been getting these " WriteAudio: buffer
>     underrun" messages in my Mythfrontend log which causes pauses during
>     playback.
>     So I'm trying to review my ALSA setup which I admit I just copied
>     from the Wiki, so if anyone has some advice I would be glad to hear it.
>     I'm using an on board nvidia sound card which I'm outputting my
>     SPDIF to my AMP.
>     Note the current setup does produce sound and it seems good to me
>     but perhaps if there is a way to optimise the buffers perhaps this
>     might fix the issue I have with the buffer underrun.
>     # cat /etc/asound.conf
>     #Generated by system-config-soundcard
>     #If you edit this file, don't run system-config-soundcard,
>     #all your changes here could be lost.
>     #SWCONF
>     #DEV 0
>     defaults.pcm.card 0
>     defaults.pcm.device 0
>     defaults.ctl.card 0
> Sorry Paul, I can not help with the asound.conf file, as none of my Myth
> machine (3) have that file.  However, I do wonder if the pauses are
> caused by the buffer underrun you reported. As my logs are full of the
> same WriteAudio: buffer underrun message, they seem to be a few seconds
> apart, but I do not notice any pause when watching anything, including HD.
> I seem to recall something to do with the video causing stuttering, I
> will have a look to see if I can find what that was.  But I would
> probably stop looking at the audio at present, and focus more on the
> video settings.
> Hope this helps,
> Jeff.

note mine are appearing exactly every 60 secs not sure why but if seems to occur mainly on 
the ABC digital recordings..


More information about the linux mailing list