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no sound from MPV

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  no sound from MPV Sharon Kimble <boudiccas@skimble.plus.com> - 2019-07-10 17:30 +0200
    Re: no sound from MPV Curt <curty@free.fr> - 2019-07-10 17:50 +0200
    Re: no sound from MPV Jonas Smedegaard <jonas@jones.dk> - 2019-07-10 18:00 +0200
      Re: no sound from MPV Sharon Kimble <boudiccas@skimble.plus.com> - 2019-07-11 10:30 +0200

#211165 — no sound from MPV

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Ever since upgrading to buster I've been completely unable to get any sound out of MPV. And I haven't found any way online of how to re-enable sound for it either. SMplayer works okay and gives sound, as does mpd, but MPV views a television programmes but no sound.

How can I get the sound working again please?

Thanks
Sharon.
-- 
A taste of linux = http://www.sharons.org.uk
TGmeds = http://www.tgmeds.org.uk
DrugFacts = https://www.drugfacts.org.uk
Debian 10.0, fluxbox 1.3.7, emacs 26.2, org 9.2.4

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#211167

On 2019-07-10, Sharon Kimble <boudiccas@skimble.plus.com> wrote:

> Ever since upgrading to buster I've been completely unable to get any
> sound out of MPV. And I haven't found any way online of how to
> re-enable sound f or it either. SMplayer works okay and gives sound,
> as does mpd, but MPV vie ws a television programmes but no sound.
>
> How can I get the sound working again please?
>

I don't know. You offer little information to go on. Running 
'mpv -v foo' from the command line might say something edifying.

Do you have more than one audio device?


-- 
"These findings demonstrate that under appropriate conditions the isolated,
intact large mammalian brain possesses an underappreciated capacity for
restoration of microcirculation and molecular and cellular activity after a
prolonged post-mortem interval." From a recent article in *Nature*. Holy shit. 

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#211168

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Quoting Sharon Kimble (2019-07-10 12:13:30)
> 
> Ever since upgrading to buster I've been completely unable to get any 
> sound out of MPV. And I haven't found any way online of how to 
> re-enable sound for it either. SMplayer works okay and gives sound, as 
> does mpd, but MPV views a television programmes but no sound.
> 
> How can I get the sound working again please?

There are many ways audio can get entangled, so no single answer here...

If you try run from the command-line, the output should hint about where 
MPV sends audio.

Example:

VO: [vaapi] 300x298 yuv420p
AO: [alsa] 48000Hz stereo 2ch s32

Above tells that audio out (AO) uses the ALSA driver.

If that is the case for you, then the problem might be that something 
else on your system already occupies ALSA - maybe your web browser, or 
an audio daemon - most commonly PulseAudio.

You can try explicitly tell MPV to use Pulseaudio, like this:

  mpv --ao=pulse ...


If that works, then you can make it the default by adding/extending the 
configfile .config/mpv/ in the root of your £HOME (or /etc/mpv/mpv.conf 
as root to cover all users on your system) with this content:

  [default]
  ao=pulse

If instead your output from running from command-line shows that you are 
already using Pulseaudio, then you can try check your configuration of 
Pulseaudio that it is routing the audio to your speakers and is not 
muted (too big a topic for this email - try search the web!), or you can 
try temporarily bypass Pulseaudio and use ALSA directly, like this:

  pasuspender -- mpv ...

Beware that it is _not_ enough to tell MPV to use ALSA if you want to 
bypass Pulseaudio: It imposes as an ALSA driver so needs to be 
explicitly turned off.

Other kinds of tricks may be needed if you are running KDE (or not, but 
have some KDE applications open)...


 - Jonas

-- 
 * Jonas Smedegaard - idealist & Internet-arkitekt
 * Tlf.: +45 40843136  Website: http://dr.jones.dk/

 [x] quote me freely  [ ] ask before reusing  [ ] keep private

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#211206

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Thanks to Jonas and Curt for your replies, both of which helped me to resolve this issue.

I had never thought of running MPV from the commandline, I'd always just right-clicked the programme that I wanted to watch and never considered the command-line option. and when i did run it from the line it consistently showed as part of its output when running - mpv -v /mnt/backc/progs/Our_Lives_Series_3-Series_3-Mountain_Rescue.mp4 -

--8<---------------cut here---------------start------------->8---
[ad] Selected codec: aac (AAC (Advanced Audio Coding))
[lavfi] filter 'drc' not found or failed to allocate
[user_filter_wrapper] Creating filter 'drc' failed.
[cplayer] Audio filter initialized failed!
--8<---------------cut here---------------end--------------->8---

But when I looked closer at the output in my terminal I found this - [cplayer] Reading config file /home/boudiccas/.mpv/config - which was what I was expecting, but that config file only showed '# Write your default config options here'.

And further down the output it showed - '[cplayer] Reading config file /home/boudiccas/.config/mpv/mpv.conf'.

This was a revelation to me as I was totally unaware of this file, and in its 'audio section' it showed several uncommented items, so I commented them all out and tested MPV again. And it worked, I had sound again! 

Thank you very much, I'm a happy bunny again! :)

Jonas Smedegaard <jonas@jones.dk> writes:

> Quoting Sharon Kimble (2019-07-10 12:13:30)
>> 
>> Ever since upgrading to buster I've been completely unable to get any 
>> sound out of MPV. And I haven't found any way online of how to 
>> re-enable sound for it either. SMplayer works okay and gives sound, as 
>> does mpd, but MPV views a television programmes but no sound.
>> 
>> How can I get the sound working again please?
>
> There are many ways audio can get entangled, so no single answer here...
>
> If you try run from the command-line, the output should hint about where 
> MPV sends audio.
>
> Example:
>
> VO: [vaapi] 300x298 yuv420p
> AO: [alsa] 48000Hz stereo 2ch s32
>
> Above tells that audio out (AO) uses the ALSA driver.
>
> If that is the case for you, then the problem might be that something 
> else on your system already occupies ALSA - maybe your web browser, or 
> an audio daemon - most commonly PulseAudio.
>
> You can try explicitly tell MPV to use Pulseaudio, like this:
>
>   mpv --ao=pulse ...
>
>
> If that works, then you can make it the default by adding/extending the 
> configfile .config/mpv/ in the root of your £HOME (or /etc/mpv/mpv.conf 
> as root to cover all users on your system) with this content:
>
>   [default]
>   ao=pulse
>
> If instead your output from running from command-line shows that you are 
> already using Pulseaudio, then you can try check your configuration of 
> Pulseaudio that it is routing the audio to your speakers and is not 
> muted (too big a topic for this email - try search the web!), or you can 
> try temporarily bypass Pulseaudio and use ALSA directly, like this:
>
>   pasuspender -- mpv ...
>
> Beware that it is _not_ enough to tell MPV to use ALSA if you want to 
> bypass Pulseaudio: It imposes as an ALSA driver so needs to be 
> explicitly turned off.
>
> Other kinds of tricks may be needed if you are running KDE (or not, but 
> have some KDE applications open)...
>
>
>  - Jonas

-- 
A taste of linux = http://www.sharons.org.uk
TGmeds = http://www.tgmeds.org.uk
DrugFacts = https://www.drugfacts.org.uk
Debian 10.0, fluxbox 1.3.7, emacs 26.2, org 9.2.4

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