[mythtv-users] Can myth DVD output 7.1 audio?

Paul Catchpole paul at paulcatchpole.co.uk
Sat Jan 12 22:06:08 UTC 2008

Michael T. Dean wrote:
> On 01/10/2008 05:36 PM, Seth Daniel wrote:
>> On Thu, Jan 10, 2008 at 05:31:39PM -0500, Michael T. Dean wrote:
>>> On 01/10/2008 05:07 PM, Michelle Dupuis wrote:
>>>> Back when my home theatre PC was running windows, I bought DVD player
>>>> software that would output 7.1 channels to my amp (8 discrete channels).
>>>> Although I'm very happy with Myth, I'm wondering if I've given up a nice
>>>> feature....
>>>> Does Myth's DVD player decode 8 discrete channels?  I've confirmed using
>>>> speaker-test that my 8 channels are working, but movies like Gladiator
>>>> (which are in DTS 6.1) don't seem to provide anything beyond 2 channels in
>>>> myth.
>>> http://svn.mythtv.org/trac/ticket/1104
>> Reading this ticket was interesting, but I don't get it.  How would such
>> a setup be...setup?  I can do 7.1 now if I simply pass-thru to my sound
>> card (at least I think I can) and my receiver can deal with it.  So what
>> does the work this ticket describes do?  Can someone explain it, please?
> Allows 5.1-channel audio output through analog (or 5.1-channel 
> re-encoding for timestretch).  Without the patch, you have 2 choices, 
> 2-channel analog and/or AC-3/DTS passthrough.
> Mike
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Isn't there a third choice here? Without the patch, setting myth to use 
the 6-channel device and setting maxchannels to 6 will cause myth to 
output 6-channel audio correctly. The patch addresses the problem that 
then occurs with 2-channel audio sources where the same 6-channel device 
is used, leading to 2-speaker output - whereas the current version of 
the patch will upmix for you. The old version of the patch would let you 
choose an alternative output device for using your own upmixer.

That's how it works for me, anyhoo... :-)


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