[gstreamer-bugs] [Bug 605594] New: relatively high cpu usage compared to other players

[GStreamer (bugzilla.gnome.org)]

https://bugzilla.gnome.org/show_bug.cgi?id=605594
  GStreamer | gstreamer (core) | 0.10.x

           Summary: relatively high cpu usage compared to other players
    Classification: Desktop
           Product: GStreamer
           Version: 0.10.x
        OS/Version: Linux
            Status: UNCONFIRMED
          Severity: enhancement
          Priority: Normal
         Component: gstreamer (core)
        AssignedTo: gstreamer-bugs at lists.sourceforge.net
        ReportedBy: leidola at web.de
         QAContact: gstreamer-bugs at lists.sourceforge.net
      GNOME target: ---
     GNOME version: ---


Playing an audio file (vorbis, mpeg) using gstreamer (via gst-launch, rhythmbox
and so on) I have a higher cpu than using other players, e.g. mplayer, mpg123
and so on. The cpu usage is always two to three times higher than any other
player I've tested.

time mplayer  some_file.ogg; time gst-launch-0.10 playbin
uri=file:///"`pwd`/somefile.ogg"

==========================================================================
Öffne Audiodecoder: [ffmpeg] FFmpeg/libavcodec audio decoders
AUDIO: 44100 Hz, 2 ch, s16le, 192.0 kbit/13.61% (ratio: 24000->176400)
Ausgewählter Audiocodec: [ffvorbis] afm: ffmpeg (FFmpeg Vorbis)
==========================================================================
AO: [alsa] 44100Hz 2ch s16le (2 bytes per sample)
Video: kein Video
Starte Wiedergabe...
A: 331.3 (05:31.2) of 331.4 (05:31.4)  1.0% 

real    5m31.586s
user    0m6.428s
sys    0m1.804s

(gst-launch-0.10:21852): GLib-WARNING **: g_set_prgname() called multiple times
Setting pipeline to PAUSED ...
Pipeline is PREROLLING ...
Pipeline is PREROLLED ...
Setting pipeline to PLAYING ...
New clock: GstAudioSinkClock
Got EOS from element "playbin0".
Execution ended after 331431382411 ns.
Setting pipeline to PAUSED ...
Setting pipeline to READY ...
Setting pipeline to NULL ...
Freeing pipeline ...

real    5m32.227s
user    0m21.937s
sys    0m2.136s

In this case gstreamer uses 3.4 times more cpu time to play a simple ogg file
(using 6.6 % of the cpu power).

While 6.6 % is not much, it drains more battery power of a notebook.

This is reproducible (at least) using an ATOM processor and gentoo-x86 as
system. Everything was compiled using -O2.

Processor    : 0
vendor_id    : GenuineIntel
cpu family    : 6
model        : 28
model name    : Intel(R) Atom(TM) CPU N280   @ 1.66GHz
stepping    : 2
cpu MHz        : 1667.000
cache size    : 512 KB
physical id    : 0
siblings    : 2
core id        : 0
cpu cores    : 1
apicid        : 1
initial apicid    : 1
fdiv_bug    : no
hlt_bug        : no
f00f_bug    : no
coma_bug    : no
fpu        : yes
fpu_exception    : yes
cpuid level    : 10
wp        : yes
flags        : fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov
pat clflush dts acpi mmx fxsr sse sse2 ss ht tm pbe nx constant_tsc
arch_perfmon pebs bts pni dtes64 monitor ds_cpl est tm2 ssse3 xtpr pdcm movbe
lahf_lm
bogomips    : 3324.91
clflush size    : 64
power management:

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