[Bug 693981] New: [subparse] Fix invalid discontinuity detection

[GStreamer (bugzilla.gnome.org)]

https://bugzilla.gnome.org/show_bug.cgi?id=693981
  GStreamer | gst-plugins-base | 1.x

           Summary: [subparse] Fix invalid discontinuity detection
    Classification: Platform
           Product: GStreamer
           Version: 1.x
        OS/Version: Linux
            Status: UNCONFIRMED
          Severity: normal
          Priority: Normal
         Component: gst-plugins-base
        AssignedTo: gstreamer-bugs at lists.freedesktop.org
        ReportedBy: rawoul at gmail.com
         QAContact: gstreamer-bugs at lists.freedesktop.org
     GNOME version: ---


Created an attachment (id=236400)
 View: https://bugzilla.gnome.org/attachment.cgi?id=236400
 Review: https://bugzilla.gnome.org/review?bug=693981&attachment=236400

fix off by one offset calculation

Discontinuities are detected in the subparse buffer chain function, because the
buffer offset is used even when invalid. This results in the subtitle parser
being reset, and some subtitle lines are not shown.

The attached patch is a trivial fix.

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