[mythtv-users] No MythTV volume control when using S/PDIF

[gLaNDix (Jesse Kaufman)]

Brian Stults wrote:
> Donavan Stanley wrote:
> 
>>On 7/24/05, Phill Edwards <philledwards at gmail.com> wrote:
>>
>>
>>>Is this normal or have I done something wrong? If it is normal could
>>>someone please briefly explain why. I'm assuming it's something to do
>>>with the audio signal now being passed straight from one piece of
>>>hardware (the S/PDIF connector on the MythTV box) to another (the
>>>receiver) so there's no opportunity for software to interfere with the
>>>volume settings. Is that correct?
>>
>>
>>Correct.
> 
> 
> 
> I believe what you say, but if that's true, I don't understand why I am
> able to control the volume coming out of my SPDIF using alsamixer.
> Could you explain this?

it depends ... when using AC3 passthrough, no, you cannot adjust volume, 
you must use your Dolby Digital compatible receiver to control volume 
... when doing PCM (basically anything else except DTS), you can adjust 
volume ... using a SBLive! Value 1024 here ...

-g-