[Bug 784831] New: Seeking a pipeline containing concat only seeks the latest source

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=784831

            Bug ID: 784831
           Summary: Seeking a pipeline containing concat only seeks the
                    latest source
    Classification: Platform
           Product: GStreamer
           Version: 1.10.5
                OS: Linux
            Status: NEW
          Severity: normal
          Priority: Normal
         Component: gstreamer (core)
          Assignee: gstreamer-bugs at lists.freedesktop.org
          Reporter: jkelleyy at gmail.com
        QA Contact: gstreamer-bugs at lists.freedesktop.org
     GNOME version: ---

Created attachment 355384
  --> https://bugzilla.gnome.org/attachment.cgi?id=355384&action=edit
Code to reproduce the bug

It seems that concat simply forwards the seek event to the current sink pad,
and so if we try to seek to the beginning of the pipeline it only seeks part of
the way.

I've attached a file that demonstrates the issue. It needs a test.ogg file that
runs for 2 minutes. The code runs a pipeline consisting of two copies of
test.ogg concatenated with concat. It runs the pipeline for 3 minutes and then
tries to seek to the start. I would expect then the code to run for a total of
7 minutes, instead it runs for 5 minutes.

I'm on 1.10.5

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