[mythtv-users] AC3 to SPDIF option

Richard Pickler rpickler at gmail.com
Tue Feb 13 19:30:59 UTC 2007

I used the .asoundrc file from wilsonnet (with one change, noted below) to
solve this exact problem.  Works like a charm.


If you look at the start of the file, you'll notice the block:

pcm.!default {
  type plug
## Uncomment the following to use mixed analog by default
#  slave.pcm "dmix-analog"
## Uncomment the following to use unmixed digital by default
  slave.pcm "digital-hw"
## Uncomment the following to use mixed digital by default
#  slave.pcm "dmix-digital"

I use the third option "dmix-digital", which outputs everything over
the digital connection

On 2/13/07, Rich West <Rich.West at wesmo.com> wrote:
> Michael Wisniewski wrote:
> > Hi!
> >
> >    I'm off from work because of the snow, and I've been hitting myth
> > hard so that is why I have so many questions.  :-)
> >
> >    Anyways, I have a question about the "Enable AC3 to SPDIF
> > passthrough".  When I have this option enabled, AC3 does pass through
> > to my receiver in Dolby Digital form, like it should.  When I disable
> > it, it doesn't.  That makes sense, and works how I would have suspected.
> >
> >     But now, when I play a non-ac3 stream and have my receiver off, it
> > plays through the speakers on my tv fine, using the line-out of the
> > soundcard.  But when I try to play an ac3 dolby digital stream, the
> > line-out of the sound card makes a bunch of clicks through the
> > speakers on the tv.
> >
> >     Is there a way to make it so that the line-out of the soundcard
> > plays the stream no matter what, while the SPDIF out plays the digital
> > stream?
> >
> >
> > Thanks!
> Check the WIKI:
> http://www.mythtv.org/wiki/index.php/Configuring_Digital_Sound_with_AC3_and_SPDIF
> -Rich
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