[mythtv-users] Switch to ALSA from OSS sound problem

[Jarod C. Wilson]

On Oct 28, 2003, at 9:58 PM, Carl Petersen wrote:

>  I skipped the ALSA install fallowing Jarod's excellent tutorial.
>  And found the output sound level to the TV to not be to my liking.  
> So I figured the ALSA install would correct this problem, right?

Well, you could have simply adjusted the volume using OSS...

>  So I installed ALSA, and that went great.  Rebooted.
>  Started gnome-alsamixer, and turned everthing on.  Eventually found a 
> jack on the back that played /usr/bin/aplay 
> /usr/share/sound/KDE_Startup.wav out of the TV.  Fabulous.
>
>  Now when I start 'mythfrontend' and go to view a recorded show, or 
> live TV, I hear no sound
> at all.  I can still do 'aplay' of WAVs out of the TV, and 
> PC-speaker-beeps are coming out of the TV, but MythTV-sound is not 
> coming out of the TV.
>
>  Did some groveling over the newsgroup, found the mod that if I add 
> '-ao alsa9' to my mplayer invocation:
>   mplayer -ao alsa9 /some/previously/records/show
> -or even-
>  mplayer -ao alsa9 /dev/video0
> I can get sound.  So the recordings seem to be working.  The PVR-250 
> is clearly bringing in a signal, but ... *shrug*

*shrug* indeed... That's a new one to me.

> I fiddled with all the 'Setup->General' options for sound, choosing 
> all of them at one point, but
> failed to hit a working combination.
>
> What have I done wrong, and, more importantly, how do I fix it?  :-)

Quite baffling. I'm turning it over in my head, but not coming up with 
a logical explanation. Try starting up playback of a recording from 
within MythTV (one that works as expected w/mplayer), and launch 
alsamixer or gnome-alsamixer while it is playing, and see if one of the 
sliders has dropped way down for some reason (move some around while 
the video is playing, see if it has any effect). If so, you have a 
volume setting in MythTV that is off kilter, I think. How that would 
have happened, I dunno, but that's about all I can think of at the 
moment...

--Jarod

-- 
Jarod C. Wilson, RHCE

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