[mythtv-users] Sound issue that I can't seem to figure out

[Nick Morrott]

On 30/10/2008, Harry Devine <lifter89 at comcast.net> wrote:
> José Tomás @ Chico wrote:
>  > You may have the same issue that I have. A profile recording issue...
>  >
>  > google: "site:www.mythtv.org tomas chico" or read
>  > "http://www.mythtv.org/pipermail/mythtv-users/2008-October/235352.html"
>  >
>  > Talking with a couple of friends that tried mythtv I found that this
>  > issue is more common then I espect, I believe that the mythtv team
>  > should try to make visible the solution. Those friends decided that
>  > mythtv was not good :-O, one of them has one of those very good card,
>  > and so he was a success.
>  >
>  > Tomás
>  > Harry Devine wrote:
>  >> OK, now that my video issue is resolved (via another post/thread), I'm
>  >> moving onto my sound issue.  On my combined FE/BE Mythbuntu setup, if I
>  >> go into Utilities/Setup->Setup->General->Audio (3rd screen), I have the
>  >> following settings:
>  >>
>  >> Audio output device: ALSA:default
>  >> Passthrough output device:   Default
>  >> Max audio channels:   Stereo
>  >> Upmix:   Passive
>  >> Enable AC3 to SPDIF passthrough (checked)
>  >> Enable DTS to SPDIF passthrough (checked)
>  >> Aggressive sound ca (unchecked - not sure what the full wording is; it's
>  >> off the right of the screen)
>  >> Use internal volume (checked)
>  >> Mixer Device:   /dev/mixer
>  >> Mixer Controls:   PCM
>  >> Master Mixer Volume:   100
>  >> PCM Mixer Volume:   100
>  >> Independent Muting of Left and Right Audio Channels (unchecked).
>  >>
>  >> When I tune to LiveTV, I get no sound, and the following in my frontend log:
>  >>
>  >> 2008-10-28 19:35:54.678 Opening audio device 'default'. ch 2(2) sr 48000
>  >> 2008-10-28 19:35:54.678 Opening ALSA audio device 'default'.
>  >> ALSA lib control.c:909:(snd_ctl_open_noupdate) Invalid CTL /dev/mixer
>  >> 2008-10-28 19:35:54.699 AudioOutput Warning: Mixer attach error -2: No
>  >> such file or directory
>  >>                         Check Mixer Name in Setup: '/dev/mixer'
>  >>
>  >> I can play music from within Myth fine, as well as get sounds from a
>  >> terminal from outside of Myth.  I just can't get any audio for the TV.
>  >> I have a pcHD5500 card and have it set to use /dev/dsp as it's audio
>  >> device in the Capture Card setup for it.
>  >>
>  >> Any ideas?
>  >> Harry
>  >>
>  >> _______________________________________________
>  >> mythtv-users mailing list
>  >> mythtv-users at mythtv.org
>  >> http://mythtv.org/cgi-bin/mailman/listinfo/mythtv-users
>  >>
>  >>
>  >
>  >
>  > --
>  > *José Tomás*
>  > ------------------------------------------------------------------------
>  > Chico.mine.nu
>  > http://chico.mine.nu/
>  >  MSN: jfht at netc.pt
>  >  Skype: jfhtomas
>
> > ------------------------------------------------------------------------
>  >
>  > ------------------------------------------------------------------------
>
> >
>  > _______________________________________________
>  > mythtv-users mailing list
>  > mythtv-users at mythtv.org
>  > http://mythtv.org/cgi-bin/mailman/listinfo/mythtv-users
>  >
>
> I tried that, but it didn't work.  I still have no sound.  I also tried
>  setting the Audio Mixer to ALSA:Default as Nick suggested and that
>  didn't work either.  Here's my latest snippet from my frontend log:
>
>  2008-10-29 21:07:59.459 Opening audio device 'default'. ch 2(2) sr 48000
>  2008-10-29 21:07:59.460 Opening ALSA audio device 'default'.
>  2008-10-29 21:07:59.481 mixer unable to find control Master 1

OK - it now looks like you have a working mixer, but MythTV is trying
to control the wrong mixer control. The audio dialogue usually
provides a choice between "Master" and "PCM", so please try both of
these in turn. Your current mixer config seems to be set to "Master 1"
which could be a typo (or it could also exist, but I guessing this is
why you still get no sound). MythTV prepopulates the list with the
options "Master" and "PCM" so try these before configuring the setting
manually.

In case it helps, please post the output of

# aplay -l

and

# amixer scontrols

The aplay command will list your audio card(s) details, whilst the
amixer command will list the current mixer controls (important for the
paragraph above). If you have multiple sound cards, use

$ amixer -c 0 scontrols

for the first card,

$ amixer -c 1 scontrols

for the second etc.

Because this issue (and your log messages) relates to audio _output_
from MythTV, I don't think it has anything to do with your recording
profiles.

-- 
Nick Morrott

MythTV Official wiki:
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