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

N Dugas normdugas at yahoo.ca
Sun Apr 16 21:44:02 UTC 2006


Pete wrote:
> 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.
> 
I've tried that too and got the chipmunk effect on analog recordings 
when AC# to SPDIF passthrough is enabled.
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