[pulseaudio-discuss] Equalizer setting is forgotten until PA is restarted and sound stutters

Jason Newton nevion at gmail.com
Tue Jul 8 03:40:19 PDT 2014

On Mon, Jul 7, 2014 at 8:47 AM, Zsolt Szakács <szakacs.zsolt at zoho.com>

>  Hello,
> I'm using the equalizer sink for PulseAudio 4.0 under SolydK so that my
> subwoofer emits sound only about 80 Hz and below in my 5.1 sound system. (I
> wanted to try another solution to do this, as I wrote in my post on
> Stackexchange here
> <http://unix.stackexchange.com/questions/138810/low-pass-filter-on-lfe-using-pulseaudio>,
> but it wasn't successful.) Also, I'm using gstreamer.
> One problem is that every time I reboot, the settings in qpaeq don't seem
> to take effect. Even if I open qpaeq and start moving the scales, the
> change is not reflected in the sound at all. However, if I enter *pulseaudio
> -k* and then *pulseaudio -D* in the terminal, I can hear that
> equalization is applied.


Re the equalizer, this sounds very odd, perhaps somehow one of the modules
is not loaded when your desktop environment starts pulse?  Could you try
using pacmd list-modules and look for module-dbus-protocol and
module-equalizer-sink on such conditions?  Are you sure applications are
being routed through the equalizer? A good way to check is pavucontrol.

> Another problem is that when the equalized sink is the default sink, sound
> stutters when watching a video on YouTube with Firefox and Flash or playing
> an mp3 with VLC. However, there is stuttering only at the beginning or the
> end of playing (when I select stop) or jumping to a particular position
> while playing a video in SMplayer, Mplayer, VLC, or listening to music in
> Clementine.

These are buffering issues manifesting with flash and others with events
causing a rewind (start/stop/seek) when multiple sources are active - my
advice for now is to not use flash and the equalizer together and instead
have flash content go directly to the device sink. The rewind issues on
multiple sources is another long standing issue to fix but if you do not
have multiple sources active, it will not manifest. For what its worth,
they are problems I want to look into to characterize better and fix but I
am months out from having the luxury of time to do it.

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