[Bug 768473] New: playback is not playing smoothly after selecting .sub or .srt subtitle to the playing file

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=768473

            Bug ID: 768473
           Summary: playback is not playing smoothly after selecting .sub
                    or .srt subtitle to the playing file
    Classification: Platform
           Product: GStreamer
           Version: 1.4.1
                OS: Linux
            Status: NEW
          Severity: normal
          Priority: Normal
         Component: gst-plugins-base
          Assignee: gstreamer-bugs at lists.freedesktop.org
          Reporter: jyoti_opal15 at yahoo.com
        QA Contact: gstreamer-bugs at lists.freedesktop.org
     GNOME version: ---

Frame drops seen when there is subtitle to display, if we select some subtitle
file for some other video. 
For ex, 
For some video songs and selecting some movie subtitle, whenever we have
subtitle to display, then we are observing the frame drops. Following is the
pipeline we are using:

 gst-launch-1.0 textoverlay name=overlay ! imxeglvivsink filesrc location=<i/p
file>  ! aiurdemux name=demux demux. ! queue ! imxvpudec ! overlay.video_sink
demux. ! queue ! aacparse ! beepdec ! audioconvert ! volume volume=1 !
audioresample ! alsasink filesrc location=<i/p file>  !
"application/x-subtitle"  ! queue ! subparse ! overlay.text_sink

It looks like pipeline is taking around 40-50% of CPU at the time of frame
drop.

If we dont have subtitle to display, then playback is smooth and CPU usage is
also not more than 10%.

We are testing on nxp's imxsabrelite dual core board.

Can you please help us debug this issue?

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