[mythtv-users] Assistance with digital audio configuration requested

Karl Newman newmank1 at asme.org
Tue Aug 20 00:15:24 UTC 2013


On Mon, Aug 19, 2013 at 12:52 PM, John Nissley <jnissley at nissley.org> wrote:

> On Fri, 2013-08-16 at 14:28 -0700, Karl Newman wrote:
> > On Fri, Aug 16, 2013 at 1:10 PM, Joseph Fry <joe at thefrys.com> wrote:
> >         On Fri, Aug 16, 2013 at 4:02 PM, John Nissley
> >         <jnissley at nissley.org> wrote:
> >         > I am running close to the latest trunk of mythtv and for the
> >         last few
> >         > months I have been having some interesting challenges with
> >         digital
> >         > audio.
> >         > I am running Fedora 18 and an intel CPU with intel graphics
> >         and sound
> >         > drivers.  A few months ago the digital sound stopped going
> >         out through
> >         > my spdif connector and started going through my DVI
> >         connector that is
> >         > connected with a DVI to HDMI connector to my TV.  My TV has
> >         a spdif out
> >         > but it only works for TV stations the TV tunes and not sound
> >         coming in
> >         > from an HDMI port.  I am trying to get the digital sound to
> >         go through
> >         > my SPDIF connection so I can get it to my tuner.
> >         > Can anyone point me in the direction to get this resolved?
> >         > Many thanks..
> >
> >
> >         If the sound is being carried VIA the graphics cable, then
> >         most likely
> >         you have two sound devices in your system.  One is probably a
> >         standard
> >         Intel or Realtek HDA hosting your spdif.  The other is likely
> >         associated with your video card.  In mythtv's playback menus,
> >         make
> >         sure that your explicitly telling it to use the standard sound
> >         card,
> >         not the video card.
> >
> > There was also a change to ALSA in kernel 3.8 which broke S/PDIF. It
> > was about device numbering or something. It was broken in favor of
> > fixing HDMI sound, but I think a newer version of alsa-lib can fix it,
> > but you'd need to re-scan in myth. It may not solve your problem, but
> > it might be something worth exploring.
> >
> >
> > Karl
> >
> Thanks for your response. I am on kernel version 3.10.7-100 fc18 and my
> alsa lib is alsa-lib-1.0.26-2.fc18.x86_64.  Do you have any idea if this
> is the offending lib version and if so what is the best way to replace
> it with a new one.  I have even tried installing a stand alone PCI sound
> card just to make sure it was not in internal motherboard issue and
> still no success.  I have basically tested with all available sound
> outputs that mythtv give me and found that only the HDMI and analog
> outputs work.
>
> From what I can tell, you would need to upgrade to alsa-lib 1.0.27 to get
S/PDIF to work again, or downgrade your kernel to 3.7 (maybe--your distro
might pull in patches early). Look at this changelog section:
http://www.alsa-project.org/main/index.php/Detailed_changes_v1.0.26_v1.0.27#Control_API

Karl
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