[mythtv-users] PVR350 and SPDIF

[David]

James Satterfield wrote:

>Stephen Tait <tait at digitallaw.co.uk> wrote: 
>  
>
>>At 16:59 06/09/2004, you wrote:
>>    
>>
>>>I'm using a pvr350 for tvout. Currently I'm running the audio out from
>>>      
>>>
>>the
>>    
>>
>>>pvr350 to the line-in on the onboard sound. Speaker out on the sound goes
>>>      
>>>
>>to
>>    
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>>>the stereo. I'd like to use spdif to the stereo. I've seen in the past
>>>      
>>>
>>that
>>    
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>>>it's difficult to get the sound card to take the line-in audio and pump
>>>      
>>>
>>it
>>    
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>>>out over the spdif.
>>>      
>>>
>Right, but the trick here is getting the line-in on the soundcard digitized
>and send out the spdif.
>
>James.
>  
>
correct.

I've done it - it's almost pointless :)
It would mean that I can leave my amp set to spdif input and use my myth 
box to manage the volume.

http://www.mythtv.info/moin.cgi/DigitalSoundHowTo#head-643f2586d7d128f5da749aca0ab6d44551311577

essentially run:

  arecord -D hw:0,0 -fdat | aplay -D mixed-digital 
in the background.

(I don't think you can 'passthru' - as James says, you do need to sample and retransmit.

It's not a realistic solution - but you can do it ;)

David

PS and you can't hw decode the mpeg and extract the digital sound and send it straight to the spdif AFAIK - maybe sometime in ivtv's future.
Or maybe you could synchronise a sw decode of just the mp2 stream - but why bother...