[mythtv-users] AC3 passthrough

Michael T. Dean mtdean at thirdcontact.com
Tue Jun 13 22:11:08 UTC 2006


On 06/13/2006 05:05 PM, Landon Clark wrote:
> On 6/13/06 1:03 PM, "Michael T. Dean" <mtdean at thirdcontact.com> wrote:
>> On 06/13/2006 02:44 PM, Landon Clark wrote:
>>     
>>>> Finally
>>>> got it to work by setting the passthrough device to be dmix.  I am not sure
>>>> if that is good or bad, but it works so I am going with it!
>>>>         
>> Heh.  That means that the device you've specified is not being used or
>> your receiver is "upmixing" 2-channel to multi-channel output.  The
>> direct-mixing plugin is only 2-channel capable, so any sound passed over
>> it would be 2-channel only, and--as it manipulates the stream--would not
>> be passthrough.
>>
>>     
> Hmmm, now I am even more intrigued since my receiver clearly thinks that
> this is a surround sound signal...  It has the ability to convert 2 channel
> to 5.1, but it clearly letıs you know when it is doing that.  It labels this
> as Dolby Digital AC3.  Any thoughts on how this might be possible in the
> context of what you are saying above?
>   

My guess is that xine is ignoring the value you specified and using the 
default ( iec958:AES0=0x6,AES1=0x82,AES2=0x0,AES3=0x2 ), which should 
work on most (if not all) cards.

Mike


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