Public bug reported:
When playing music using gstreamer & alsa, the cpu usage is higher then
expected compare to other configuration.
Step to reproduce :
gst-launch filesrc location='any.mp3' ! mad ! audioconvert ! alsasink
With great help of gstreamer and alsa developers we manage to identify
the problem come from the dmix'ed default device in alsa. To completely
fix the problem, I add the following line in /etc/asound.conf
defaults.pcm.dmix.rate 44100
The result is starting from a 17% cpu usage to 3%.
The conclusion is Alsa are not using the right sample rate in dmix.
ProblemType: Bug
Architecture: i386
DistroRelease: Ubuntu 9.04
Package: gstreamer0.10-alsa 0.10.22-5
ProcEnviron:
SHELL=/bin/bash
LANG=en_CA.UTF-8
SourcePackage: gst-plugins-base0.10
Uname: Linux 2.6.29-02062903-generic i686
** Affects: gst-plugins-base0.10 (Ubuntu)
Importance: Undecided
Status: New
** Tags: apport-bug i386
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gstreamer/alsa high cpu usage (wrong sample rate)
https://bugs.launchpad.net/bugs/391861
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