Public bug reported:
Changing volume while parec records monitor causes recorded sound to
stutter (synonyms: lag, jump, skips). This was tested on audio coming
from Firefox/Flash as well as VLC. Both applications produce the same
result.
How to reproduce:
1) Use the following script which finds the monitor pseudo-device and records
its output to a file using sox.
#!/bin/bash
#This script requires sox, if not installed, run " sudo apt-get install sox"
command first.
# Get PA sink monitor name:
MONITOR=$(pactl list | grep -A2 '^Source #' | grep 'Name: .*\.monitor$' | awk
'{print $NF}' | tail -n1)
# Record monitor output
echo "Recording from $MONITOR"
echo "Press Ctrl-C or close window to stop recording"
parec -d "$MONITOR" | sox -t raw -r 44100 -sLb 16 -c 2 - ~/output.wav
2) While it is recording, play with the volume controls (top panel
volume/speaker icon) to bring the volume all the way down, and then all
the way up using your mouses scroll wheel or touchpads scroll
functionality.
Result: recorded sound stutter or lags
Expected: monitor device is not linked to output volume therefore sound
should be recorded without interference from regular system use.
Question: Trying to find the cause of the interference is beyond me.
Could this issue be related to sox? If so, could someone recommend or
test this script with a different program?
ProblemType: Bug
DistroRelease: Ubuntu 12.04
Package: pulseaudio-utils 1:1.1-0ubuntu15.1
ProcVersionSignature: Ubuntu 3.2.0-26.41-generic-pae 3.2.19
Uname: Linux 3.2.0-26-generic-pae i686
NonfreeKernelModules: wl
AlsaVersion: Advanced Linux Sound Architecture Driver Version 1.0.24.
AplayDevices:
**** List of PLAYBACK Hardware Devices ****
card 0: Intel [HDA Intel], device 0: ALC268 Analog [ALC268 Analog]
Subdevices: 0/1
Subdevice #0: subdevice #0
ApportVersion: 2.0.1-0ubuntu8
Architecture: i386
ArecordDevices:
**** List of CAPTURE Hardware Devices ****
card 0: Intel [HDA Intel], device 0: ALC268 Analog [ALC268 Analog]
Subdevices: 1/1
Subdevice #0: subdevice #0
AudioDevicesInUse:
USER PID ACCESS COMMAND
/dev/snd/controlC0: komputes 1936 F.... pulseaudio
komputes 3871 F.... pulseaudio
/dev/snd/pcmC0D0p: komputes 3871 F...m pulseaudio
Card0.Amixer.info:
Card hw:0 'Intel'/'HDA Intel at 0xf0540000 irq 44'
Mixer name : 'Realtek ALC268'
Components : 'HDA:10ec0268,102802b0,00100101'
Controls : 17
Simple ctrls : 10
Date: Sun Jul 15 08:30:10 2012
InstallationMedia: Ubuntu 12.04 LTS "Precise Pangolin" - Release i386
(20120423.2)
ProcEnviron:
TERM=xterm
PATH=(custom, user)
LANG=en_US.UTF-8
SHELL=/bin/bash
SourcePackage: pulseaudio
UpgradeStatus: No upgrade log present (probably fresh install)
dmi.bios.date: 04/09/2010
dmi.bios.vendor: Dell Inc.
dmi.bios.version: A07
dmi.board.name: CN0J14
dmi.board.vendor: Dell Inc.
dmi.board.version: A07
dmi.chassis.type: 8
dmi.chassis.vendor: Dell Inc.
dmi.chassis.version: A07
dmi.modalias:
dmi:bvnDellInc.:bvrA07:bd04/09/2010:svnDellInc.:pnInspiron910:pvrA07:rvnDellInc.:rnCN0J14:rvrA07:cvnDellInc.:ct8:cvrA07:
dmi.product.name: Inspiron 910
dmi.product.version: A07
dmi.sys.vendor: Dell Inc.
** Affects: pulseaudio (Ubuntu)
Importance: Undecided
Status: New
** Tags: apport-bug i386 precise
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https://bugs.launchpad.net/bugs/1024955
Title:
Changing volume while parec records monitor causes sound to studder
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