[mythtv-users] Partly OT: Output analog recordings to SPDIF

Pete pete at putzin.net
Sun Apr 16 19:12:10 UTC 2006


N Dugas wrote:
> Michael T. Dean wrote:
>   
>> On 04/16/2006 01:40 AM, N Dugas wrote:
>>
>>     
>>>>> On Apr 15, 2006, at 11:22 PM, N Dugas wrote:
>>>>>
>>>>>           
>>>>>> I've been playing around with SPDIF and have been able to output HD 
>>>>>> sound to SPDIF. ...
>>>>>>
>>>>>> My .asoundrc looks like this:
>>>>>>
>>>>>> pcm.!default {
>>>>>>   type plug
>>>>>>   slave.pcm dmix-nforce
>>>>>> } ...
>>>>>>             
>>> Ah ha.  I found that if I uncheck the "Enable AC3 to SPDIF passthrough", 
>>> the audio is fine for the analog channels and it's only in stereo for 
>>> the the HD channels.  Any way of getting something suitable which would 
>>> allow me to use the SPDIF without any mucking about to enable the AC3 
>>> when watching HD recordings?
>>>       
>> There's no way you'll ever get surround with the dmix plugin because 
>> it's a 2-channel plugin.  You'd be better off with ALSA:digital from the 
>> other .asoundrc .
>>
>>     
>
> Mike, I am now using the other .asoundrc.  My original post had an 
> interim .asoundrc.  The trouble I'm having is when I select the "Enable 
> AC3 to SPIF" option, my analog audio sounds like chipmunks.  I have set 
> my device to ALSA:digital.  I'm at a loss.\
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>   
I've just finished fighting with this on my FC4 build. I was able to 
solve the problem by using ALSA:spdif instead of ALSA:digital which 
never did what I wanted it to. However, I don't have the nvidia chip, 
but rather a VT8233, so I don't know if this will help you. Apparently, 
the ALSA:spdif is a catchall alias and the HW should figure it out. Good 
luck.

-Pete


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