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

Michael T. Dean mtdean at thirdcontact.com
Thu Aug 16 00:15:03 UTC 2007


On 08/15/2007 06:00 AM, Justin The Cynical wrote:
> Joel Michael wrote:
>
>   
>> I'm getting something similar, but with a completely different setup. 
>>     
>
> *snip*
>
>   
>> 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 
>>     
>
> *snip*
>
> I did some more searching, and found this on the alsa-users mailing list 
> (http://www.mail-archive.com/alsa-user@lists.sourceforge.net/msg18519.html):
>
> "It is a problem with myth.
> myth should open difference ALSA devices depending on the type of
> sound being played.
> I.e. for AC3/DTS is should open the iec958 device.
>   

Passthrough output device

> For PCM (stereo or mono) it should open the plug:iec958 device.
>   

Audio output device

> The plug bit does the resampling and mono->stereo conversions."
>
> I'm not able to test this directly at the moment, but I am able to 
> change the setting of the default audio device from ALSA:default to 
> ALSA:plug:iec958 and watch the logs via vnc/ssh.  It appears to work, at 
> least didn't see any alsa errors going to the channel that is giving me 
> fits.
>
> Try that.  I'm going to try to test it tomorrow morning.
>
> Either way, I've submitted a bug report.  :-)

It's not a Myth problem.  It's an ALSA config/Myth config problem.

Mike


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