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

[Zsolt Szakács]

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.

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.

You can see at the end of this message the content of my default.pa 
(placed in ~/.pulse).

Any help would be appreciated.

Yours,
Zsolt

    #!/usr/bin/pulseaudio -nF
    #
    # This file is part of PulseAudio.
    #
    # PulseAudio is free software; you can redistribute it and/or modify it
    # under the terms of the GNU Lesser General Public License as
    published by
    # the Free Software Foundation; either version 2 of the License, or
    # (at your option) any later version.
    #
    # PulseAudio is distributed in the hope that it will be useful, but
    # WITHOUT ANY WARRANTY; without even the implied warranty of
    # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
    # General Public License for more details.
    #
    # You should have received a copy of the GNU Lesser General Public
    License
    # along with PulseAudio; if not, write to the Free Software Foundation,
    # Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.

    # This startup script is used only if PulseAudio is started per-user
    # (i.e. not in system mode)

    .nofail

    ### Load something into the sample cache
    #load-sample-lazy x11-bell /usr/share/sounds/gtk-events/activate.wav
    #load-sample-lazy pulse-hotplug /usr/share/sounds/startup3.wav
    #load-sample-lazy pulse-coldplug /usr/share/sounds/startup3.wav
    #load-sample-lazy pulse-access /usr/share/sounds/generic.wav

    .fail

    ### Automatically restore the volume of streams and devices
    load-module module-device-restore
    load-module module-stream-restore restore_device=false
    load-module module-card-restore

    ### Automatically augment property information from .desktop files
    ### stored in /usr/share/application
    load-module module-augment-properties

    ### Should be after module-*-restore but before module-*-detect
    load-module module-switch-on-port-available

    ### Load audio drivers statically
    ### (it's probably better to not load these drivers manually, but
    instead
    ### use module-udev-detect -- see below -- for doing this automatically)
    #load-module module-alsa-sink
    #load-module module-alsa-source device=hw:1,0
    #load-module module-oss device="/dev/dsp" sink_name=output
    source_name=input
    #load-module module-oss-mmap device="/dev/dsp" sink_name=output
    source_name=input
    #load-module module-null-sink
    #load-module module-pipe-sink

    ### Automatically load driver modules depending on the hardware
    available
    .ifexists module-udev-detect.so
    load-module module-udev-detect tsched=0
    .else
    ### Use the static hardware detection module (for systems that lack
    udev support)
    load-module module-detect tsched=0
    .endif

    ### Automatically connect sink and source if JACK server is present
    .ifexists module-jackdbus-detect.so
    .nofail
    load-module module-jackdbus-detect channels=2
    .fail
    .endif

    ### Automatically load driver modules for Bluetooth hardware
    .ifexists module-bluetooth-policy.so
    load-module module-bluetooth-policy
    .endif

    .ifexists module-bluetooth-discover.so
    load-module module-bluetooth-discover
    .endif

    ### Load several protocols
    .ifexists module-esound-protocol-unix.so
    load-module module-esound-protocol-unix
    .endif
    load-module module-native-protocol-unix

    ### Network access (may be configured with paprefs, so leave this
    commented
    ### here if you plan to use paprefs)
    #load-module module-esound-protocol-tcp
    #load-module module-native-protocol-tcp
    #load-module module-zeroconf-publish

    ### Load the RTP receiver module (also configured via paprefs, see
    above)
    #load-module module-rtp-recv

    ### Load the RTP sender module (also configured via paprefs, see above)
    #load-module module-null-sink sink_name=rtp format=s16be channels=2
    rate=44100 sink_properties="device.description='RTP Multicast Sink'"
    #load-module module-rtp-send source=rtp.monitor

    ### Load additional modules from GConf settings. This can be
    configured with the paprefs tool.
    ### Please keep in mind that the modules configured by paprefs might
    conflict with manually
    ### loaded modules.
    .ifexists module-gconf.so
    .nofail
    load-module module-gconf
    .fail
    .endif

    ### Automatically restore the default sink/source when changed by
    the user
    ### during runtime
    ### NOTE: This should be loaded as early as possible so that
    subsequent modules
    ### that look up the default sink/source get the right value
    load-module module-default-device-restore

    ### Automatically move streams to the default sink if the sink they are
    ### connected to dies, similar for sources
    load-module module-rescue-streams

    ### Make sure we always have a sink around, even if it is a null sink.
    load-module module-always-sink

    ### Honour intended role device property
    load-module module-intended-roles

    ### Automatically suspend sinks/sources that become idle for too long
    load-module module-suspend-on-idle

    ### If autoexit on idle is enabled we want to make sure we only quit
    ### when no local session needs us anymore.
    .ifexists module-console-kit.so
    load-module module-console-kit
    .endif
    .ifexists module-systemd-login.so
    load-module module-systemd-login
    .endif

    ### Enable positioned event sounds
    load-module module-position-event-sounds

    ### Cork music/video streams when a phone stream is active
    load-module module-role-cork

    ### Modules to allow autoloading of filters (such as echo cancellation)
    ### on demand. module-filter-heuristics tries to determine what filters
    ### make sense, and module-filter-apply does the heavy-lifting of
    ### loading modules and rerouting streams.
    load-module module-filter-heuristics
    load-module module-filter-apply

    ### Load DBus protocol
    .ifexists module-dbus-protocol.so
    load-module module-dbus-protocol
    .endif

    # X11 modules should not be started from default.pa so that one daemon
    # can be shared by multiple sessions.

    ### Load X11 bell module
    #load-module module-x11-bell sample=bell-windowing-system

    ### Register ourselves in the X11 session manager
    #load-module module-x11-xsmp

    ### Publish connection data in the X11 root window
    #.ifexists module-x11-publish.so
    #.nofail
    #load-module module-x11-publish
    #.fail
    #.endif

    ### Make some devices default
    set-default-sink output alsa_output.pci-0000_05_02.0.analog-surround-51
    #set-default-source input

    ### Load the integrated pulseaudio equalizer
    load-module module-equalizer-sink sink_name=equalized

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