[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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