[mythtv-users] Mac mini - no DTS or AC3 sound?

David Linville dlinvill at networksdown.com
Sun Aug 10 15:11:31 UTC 2008


On Sat, Aug 9, 2008 at 10:38 AM, Allen Edwards <
allen.edwards at oldpaloalto.com> wrote:

> Jarle Thorsen wrote:
> > I have just set up a new Mac Mini (with intel cpu) as an additional
> frontend.
> > I am using the optical output to my surround receiver.
> >
> > In Mythtv I have set it to use ALSA:default as output and ALSA:iec958 as
> > passthrough. I have also checked the passthrough for DTS and AC3 boxes.
> >
> > However I only get sound when I try to play videos containing stereo
> sound. If
> > I try to play DTS or AC3 material I get no sound at all.
> >
> > Any ideas which settings I need to have this working?
>
> I don't have a MAC so this may be different but to get sound working on
> my system I did the following:
> 1) remove or rename the two alsa config files (asound.conf and .asoundrc)
> 2) some people have to uninstall pulse audio.  I think this is with Fedora.
> 3) Sound ALSA:default
> 4) Passthrough ALSA:spdif
> 5) check Stereo (not 5.1)
> 6) turn on iec958 in alsamixer
>
>
> In my experience, if you try and follow any wiki and set up asound.conf,
> you are dead.  The defaults are used if there is no config file and they
> work great.


The above settings work for me in mythbuntu.

I've also noticed that occasionally a full power off is needed if my changes
don't seem to be sticking.  I think the hardware can get wedged and I'll
start gettting the clicking passthrough sound.  A reboot would clear  that
out with no config changes.

It's been a while since I had the problems but I have a script with the
following commands that I believe helped me reset also without the reboot:

sudo rm /var/lib/alsa/asound.state
sudo rmmod snd-hda-intel
sudo modprobe snd-hda-intel
amixer set Master 80% mute
amixer set Front 80% mute
amixer set IEC958 100% unmute
sudo alsactl store

David
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