[Bug 764120] New: concat cut off 2 seconds of second input

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=764120

            Bug ID: 764120
           Summary: concat  cut off 2 seconds of second input
    Classification: Platform
           Product: GStreamer
           Version: 1.6.3
                OS: Linux
            Status: NEW
          Severity: normal
          Priority: Normal
         Component: gstreamer (core)
          Assignee: gstreamer-bugs at lists.freedesktop.org
          Reporter: otopolsky at gmail.com
        QA Contact: gstreamer-bugs at lists.freedesktop.org
     GNOME version: ---

Created attachment 324653
  --> https://bugzilla.gnome.org/attachment.cgi?id=324653&action=edit
concat cuttoff last part of second source

Concat element somehow cuts off 2 seconds of end of second input.
This can be triggered out by analysing output of this pipeline:

gst-launch-1.0 concat name=c audiotestsrc num-buffers=200 ! queue ! c.
audiotestsrc num-buffers=200 volume=0.5 ! queue ! c. c. ! alsasink
buffer-time=1000000 sync=false

The bug is easily reproducible and it happens every time.
I use branch 1.6 from 15.3 (gstreamer - commit c5ad081b9 about baseparse)

I recorded output of soundcard with audacity and I see that last part of second
source (with volume 0.5) is much shorter than first source. Both audiotestsrc
has num-buffers=200 so they should be equal.

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