> Expected: monitor device is not linked to output volume therefore
sound should be recorded without interference from regular system use.
if sink. monitor signal just the mixed output of serveral streams
before send to the sink , the software volume of each stream should
affect the signal
** Changed in: pulseaudio (Ubuntu)
Status: Confirmed => Incomplete
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https://bugs.launchpad.net/bugs/1024955
Title:
Changing volume while parec records monitor causes sound to studder
Status in “pulseaudio” package in Ubuntu:
Incomplete
Bug description:
Changing volume while parec records monitor causes recorded sound to
stutter (synonyms: lag, jump, skips). The output sound does not
studder or lag, only the file of the recording suffers from the volume
modification. 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.
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