High CPU usage in multiple audio track in playbin3

[HoonHee Lee]

Dear All.
 
In playbin3(decodebin3) with GST v1.9.1, CPU usage is more high compared
with playbin2(decodebin2) when multiple audio track contents.
I tested 1-video and 8-audio stream by launching gst-launch.
 
Multiqueue is set as below in playbin3.
=> g_object_set (dbin->multiqueue, "sync-by-running-time", TRUE,
"use-interleave", TRUE, "max-size-buffers", 0, NULL);
In that case, CPU usage is around *210*%. And most of them are related with
*srcpads of multiqueue*.
 
In playbin2(decodebin2), CPU usage is around *15*%.
 
And I turned off the *'sync-by-running-time'* in MQ and CPU usage is similar
with playbin2.
 
I am guessing 'sync-by-running-time' mode consumes much more CPU usage than
playbin2.

Look at the captured image with top command.

Test Result in Playbin3
: 
<http://gstreamer-devel.966125.n4.nabble.com/file/n4679179/desktop_playbin3_1.png> 
: 
<http://gstreamer-devel.966125.n4.nabble.com/file/n4679179/desktop_playbin3_2.png> 
  
Test Result in Playbin2
: 
<http://gstreamer-devel.966125.n4.nabble.com/file/n4679179/desktop_playbin2_1.png> 
: 
<http://gstreamer-devel.966125.n4.nabble.com/file/n4679179/desktop_playbin2_2.png> 
 
Test Result in Playbin3 with turning off 'sync-by-running-time'
: 
<http://gstreamer-devel.966125.n4.nabble.com/file/n4679179/desktop_playbin3_off_sync_by_running_time_1.png> 
: 
<http://gstreamer-devel.966125.n4.nabble.com/file/n4679179/desktop_playbin3_off_sync_by_running_time_2.png> 
 
 
*Dear Edward Hervey, Tim-Philipp Müller and Jan Schmidt*
1) Do you have similar phenomenon?
2) Do you have a plan to reduce CPU usage when using "sync-by-running-time"?
3) May I get any opinions or guide to reduce CPU usage?
 
Please refer https://harmony.lge.com:8443/issue/browse/CTRGST-288.
 
I am always welcome any questions and opinions.
 
Thanks.
And 



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