[mythtv-users] Dual digital audio outputs
Allen Edwards
allen.p.edwards at gmail.com
Mon Nov 5 21:11:00 UTC 2018
On Mon, Nov 5, 2018, 12:53 PM John Pilkington <johnpilk222 at gmail.com wrote:
> On 05/11/18 20:02, Allen Edwards wrote:
> > Does anyone know what is wrong with my asound.conf file? Did I put it
> > in the wrong place? I think it should work, or would have worked at
> > some point in the past at least.
>
> I gave an indirect reference to paprefs earlier and you said you had
> tried it but couldn't recommend it. This was the website that I had
> seen. The screenshots look a lot like what I see on my Fedora box
> although I don't think it's actually using paprefs.
>
> "Add virtual output device for simultaneous output on all local sound
> cards"
>
> You have to do that and then make it your default device.
>
> https://www.maketecheasier.com/play-sound-through-multiple-devices-linux/
>
> I have no way of trying it myself, but it looks as if it could be true.
>
> John
>
> >
> > I did a test with an asound.conf file
> >
> > pcm.!default {
> > type plug
> > slave {
> > pcm "hw:0,1"
> > format S32_LE
> > }
> > }
> >
> > This file worked under mythbuntu8 so I know it is valid. But with this
> > file in asound.conf and ASLA default selected, I still got HDMI audio
> > and no spdif. Pretty much seems like my asound.conf file was ignored
> > and Pulse just did its thing. Without the ability to have an alsa config
> > file live, I don't see how I can get this to work on two digital outputs.
> >
> > Things change and stuff that used to work quits working. I find it
> > frustrating and without this support group, MythTV would be unusable
> IMHO.
> >
> > Allen
> >
> > On Fri, Nov 2, 2018 at 1:28 PM John Pilkington <johnpilk222 at gmail.com
> > <mailto:johnpilk222 at gmail.com>> wrote:
> >
> > On 02/11/18 19:28, Allen Edwards wrote:
> > >
> > >
> > > On Fri, Nov 2, 2018 at 11:15 AM John Pilkington
> > <johnpilk222 at gmail.com <mailto:johnpilk222 at gmail.com>
> > > <mailto:johnpilk222 at gmail.com <mailto:johnpilk222 at gmail.com>>>
> wrote:
> > >
> > > On 02/11/18 16:38, Allen Edwards wrote:
> > > > I have tried and failed to get both HDMI and SPDIF outputs
> > > working at
> > > > the same time. I can get either one working by using
> > > default:pulse and
> > > > switching them with the pulse control panel but it would
> > be nice
> > > to have
> > > > them both working without having to get up and go to a
> > terminal
> > > when I
> > > > want to listen to a show with the big sound on.
> > > >
> > > > In my old system from 10 years ago I had two SPDIF
> > outputs, one
> > > for the
> > > > TV through a converter and one into the surround system.
> > At that
> > > time
> > > > my asound.conf file looked like this:
> > > >
> > > > pcm.!default {
> > > > type plug
> > > > slave {
> > > > pcm "hw:0,1"
> > > > format S32_LE
> > > > }
> > > > }
> > > >
> > > >
> > > > I tried to follow "Simultaneous Audio Output to Independent
> > > Devices" and
> > > > eliminate the extraneous stuff and came up with this.
> > Note that
> > > the TV
> > > > gets sound from HDMI and that works but I do not get sound
> > on the
> > > > surround system.
> > > >
> > > > dad at NewMyth:~$ more /etc/asound.conf
> > > > pcm.!default {
> > > > type plug
> > > > slave {
> > > > pcm "multi_dig"
> > > > }
> > > > }
> > > >
> > > > pcm.multi_dig {
> > > > type multi
> > > > # Define SPDIF slave
> > > > slaves.a {
> > > > pcm "hw:0,1"
> > > > #tried both with and without this next line
> > > > format S32_LE
> > > > }
> > > > # Define HDMI slave
> > > > slaves.b {
> > > > pcm "hw:1,7"
> > > > }
> > > > }
> > > >
> > > > I set Myth setup to asla:default but I only get HDMI
> > audio. If I
> > > set
> > > > myth to play device hw:0,1 I get audio out of the
> > surround and
> > > if I set
> > > > it up to Nvidia HDMI 7 I get output to the TV.
> > > >
> > > > I tried to look in the Alsa website and read an article on
> > multiple
> > > > cards and all I understood was that things are probably
> > different
> > > now
> > > > and nothing that used to work will work any more. Maybe
> > that is the
> > > > problem...
> > > >
> > > > I am using Muthbuntu 16. Anybody have this working on a
> > similar
> > > system
> > > > and care to share?
> > > >
> > > > Allen
> > >
> > > Well, no, I don't have a similar system, but my fedora
> > kde/plasma setup
> > > has simultaneous audio to HDMI and builtin audio set up as
> > default. My
> > > /etc/asound.conf is effectively empty.
> > >
> > > But searching for 'ubuntu simultaneous audio ...' gave a 2018
> > reference
> > > to paprefs, Pulse Audio Preferences, a graphical utility
> > available via
> > > apt-get. It might do what you want.
> > >
> > > John
> > >
> > >
> > > John, How do you have it set up to do HDMI and builtin audio at
> > the same
> > > time? Is the built in audio digital? I suspect mine gives HDMI
> and
> > > analog although I have not tried it as that is not what I want.
> > >
> > > I tried paprefs I will spare you the details but let's just say I
> > would
> > > not recommend it.
> > >
> > > Allen
> >
> > Pity about that. My audio devices are the GK208 nvidia HDMI2 device
> in
> > a GT 710 card and the Built-in audio stereo in the 10-year old HP
> > core2duo. lspci shows 01:00.1 and 00:1b.0 The configuration is
> > through
> > a kde/plasma widget 'Audio Volume' with a virtual output device in
> its
> > 'Advanced ' tab. The details seem to have changed since my f27/28
> > upgrade and may not translate to *buntu anyway :-(
> >
> >
>
I tried it and selected the simulatenious outputs. The spdif output was
choppy and myth itself became unstable ie crashed. That is why I would not
recommend it.
Maybe I should try again.
Allen
>
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