[pulseaudio-discuss] Input sound random detection.

[Gustavo Duarte]

Tanu, you have just hit the nail on the head.

Awesome !!!

After sound mic is broken, running "paplay 
/usr/share/sounds/freedesktop/stereo/bell.oga" fix it.

As you told, skype changes the sample rate.

On other hand, if I running "paplay 
/usr/share/sounds/freedesktop/stereo/bell.oga" before skype, it avoid 
the input sound break.


To be more clear I did following two tests.

A) To check your guest.

1) boot

2) open Skype, and clall "Echo sound / service", NO msg was recorder.

3) run "paplay /usr/share/sounds/freedesktop/stereo/bell.oga"

4) open Skype, and clall "Echo sound / service", msg was recorder, mic 
start to WORKING.


B) In order to find a workaround to fix it.

1) boot

2) run "paplay /usr/share/sounds/freedesktop/stereo/bell.oga"

3) open Skype, and clall "Echo sound / service", msg was recorder, mic 
WORKS.


I wonder if there is another way more elegant, to fix it ?

(Avoid Skype or other apps change the sample rate and break the sound).


Thanks in advance.






On 8/12/16 7:43 PM, Tanu Kaskinen wrote:
> On Thu, 2016-08-11 at 12:13 -0300, Gustavo Duarte wrote:
>> On 8/11/16 11:23 AM, Tanu Kaskinen wrote:
>>>>> Comparing the system state before and after Skype could show something.
>>> You did a similar test already in the beginning, and that didn't show
>>> anything else than that there were differences in volume, but nothing
>>> was muted, so I don't really expect anything interesting to show up,
>>> but since this is a bit more controlled test than in the beginning,
>>> it's worth a shot. Here are the steps:
>>>
>>> 1) Boot
>>> 2) Open gnome sound settings, verify that the sound meter shows
>>> activity.
>>> 3) Close gnome sound settings.
>>> 4) Run "amixer -c0 > before_skype.amixer".
>>> 5) Run "pactl list > before_skype.pactl".
>>> 6) Open Skype, call Echo / Sound Test Service.
>>> 7) Try record a msg.
>>> 8) No msg was hear.
>>> 9) Run "amixer -c0 > after_skype.amixer".
>>> 10) Run "pactl list > after_skype.pactl".
>>> 11) Open gnome sound settings, verify that the sound meter doesn't show
>>> activity.
>> Attached you can find the outputs files.
> There's nothing wrong with the mixer. However, there's another change
> that Skype makes that I ignored earlier: it changes the sample rate of
> the sink and source from 44100 Hz to 48000 Hz. If the hardware doesn't
> work in 48000 Hz mode, that could perhaps explain why it starts to work
> when you change the volume in the gnome sound settings, but not when
> you change the volume with pactl (you tried that earlier, if I remember
> correctly). When you change the volume in gnome volume settings, it
> plays a small "blip" noise, and that changes the sink sample rate back
> to 44100 Hz. The source sample rate isn't affected, so it stays at
> 48000 Hz, but it doesn't seem impossible that the playback sample rate
> affects the capture side too in some way in the hardware.
>
> What if you run "paplay /usr/share/sounds/freedesktop/stereo/bell.oga"
> instead of changing the volume in gnome sound settings - does that make
> the mic work? The paplay command should change the sink sample rate to
> 44100 Hz, because the audio file uses that rate.
>
> -- 
> Tanu
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