[mythtv-users] surround 5.1 sound

Ismo Tanskanen ismot at telemail.fi
Sun Nov 4 11:25:55 UTC 2007


>  2007/11/4, Ismo Tanskanen <ismot>:
>  > On 11/03/2007 10:28 AM, Ismo Tanskanen wrote:
>  > > Is mythfrontend capable to send 5.1 sound out from soundcard's analog
>  > > connectors?
>  >
>  > Nope. AC-3 and DTS passthrough are the only ways to get digital
>  > "surround" sound. (I.e. your receiver may actually be able to detect
>  > Pro-Logic encoding (or similar) in the 2-channel stereo, depending on
>  > many issues.) See, also, ticket #1104.
>  >
>  > > I'm planning to buy cheap 5.1 speaker set to bedroom. They
>  > > don't use digital out, but connect directly to soundcard, which 
has 5.1
>  > > speaker outputs. SC is soundmax integrated (asus m2npv-mx)
>  > >
>  > > Now, I only get sound from front speakers, even if there is 5.1 
track. I
>  > > use internal player to play dvd. TV channels also transmit surround
>  > > sound often.
>  > >
>  > > In living room I have dolby amplifier and I use AC3 passthrough, 
what is
>  > > working great. But I don't want buy separate amplifier to bedroom, I
>  > > think some kind of computer 5.1 surround set (creative, logitech 
etc) is
>  > > working fine for that purpose.
>  >
>  > You'll need to fake it with a ttable-based channel copy.
>  >
>  > Mike
>  >
>  > Can you explain this a bit more.. please.
>
>  That is what wrote in my first mail. You need something like this:
>
>  pcm.20to51 {
>  type route
>  slave.pcm surround51
>  slave.channels 6
>  ttable.0.0 1
>  ttable.1.1 1
>  ttable.0.2 1
>  ttable.1.3 1
>  ttable.0.4 0.5
>  ttable.1.4 0.5
>  ttable.0.5 0.5
>  ttable.1.5 0.5
>  }
>

You can fino more information here:
http://alsa.opensrc.org/index.php/Playing_stereo_on_surround_sound_setup_%28Howt 
o%29
-- 
Glauben hei�t nicht wissen wollen, was wahr ist ... Nietzsche

Thanks, this explains thing well... I will give it a try.
-kane


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