[mythtv-users] no sound for TV-related functions

[David]

Hi All,

I've gotten (through a lot of suffering, but a lot of learning) my MythTV 
box up-and-running.  DVD's work, the jukebox is a joy, and I can record, 
playback, and pause live television.  The only problem is that sound 
doesn't work for Live TV or recorded TV.  It's perfect with my 
digital music, cds, and dvds.

Sound has been a lingering issue during this project as getting ALSA to 
work was like pulling teeth.  However, I think everything else has been 
resolved.  So here's where I stand.

Hardware:  BT878 tuner card
           Via VT8233/A/8235/8237 Audio (onboard)

I have an internal cable running from the tuner's audio-out to the onboard 
AUX-IN.  I have another cable running from my DVD to the onboard CD-IN.  
As I mentioned digital and CD sound work without a hitch.

I went to alsamixer and set "Line" to CAPTUR and muted it.
I then found "Capture" and set it to CAPTUR and set its volume to 100%.

I get no sound from the television.  If I unmute "Line," I get sound that 
is out-of-sync with video, so I know that the pass-thru is working 
correctly.  (As an aside, the quality is incredibly poor.)  I ran xawtv 
and ran aplay on my different dsp devices.  Here's what happened:
/dev/dsp -  Playing raw data '/dev/dsp'....
            underrun!!! (at least 10.985 ms long)
            underrun!!! (at least 12.499 ms long)
	    (There was no sound.)
/dev/dsp1 - (No output and no sound.)
/dev/dsp2 - Playing raw data '/dev/dsp'...
            (There was no sound.)

I'm able to load the btaudio modules, but there is no change in sound.  
I've looked extensively through the mailing list archives and on google, 
and have tried many of the approaches that others have taken, but with no 
success.

Any guidance would be greatly appreciated.

-David
david-AT-davidwadler.com