[mythtv-users] Upgraded to .20 fixes (14172), have weird digital TV sound issue

[Joel Michael]

Justin The Cynical wrote:
> When I tune in 102, I get video, but no sound (recordings are the same 
> way).  The frontend log shows:
> 
> AudioOutput Error: Channels count (1) not available: Invalid argument
> AudioOutput Error: Unable to set ALSA parameters
> 
> Now, I'm taking a wild guess that since 102 is a simulcast, the are just 
> sending out the analog programming untouched on the digital side, 
> including the mono sound output.
> 
I'm getting something similar, but with a completely different setup. 
I'm recording from a DVB-S channel (using a Twinhan DST with an Irdeto 
CAM, looking at Intelsat8 166E for SelecTV in Australia), and getting 
similar effects (video is fine, no sound at all) and error messages:

2007-08-15 19:17:26.028 Opening ALSA audio device 'iec958'.
2007-08-15 19:17:26.385 AudioOutput Error: Channels count (1) not 
available: Invalid argument
2007-08-15 19:17:26.385 AudioOutput Error: Unable to set ALSA parameters
2007-08-15 19:17:26.387 NVP: Disabling Audio, reason is: Unable to set 
ALSA parameters

This only happens on a couple of channels (at least Cartoon Network).

> Might this be a Myth issue, or Alsa?  And how would one go about fixing it?
> 
I'm not sure either, but I'd guess it's more ALSA than Myth.  The 
frontend that's having the problems is using the hda_intel driver for 
audio output.  My sound output device is set as ALSA:iec958, as I'm 
sending all the sound to a Pioneer receiver over co-ax SPDIF (mainly so 
I can pass through AC3 and DTS from DVDs and some DVB-T channels).  I'm 
wondering if I need a .asoundrc to help with this problem?