[Bug 708276] New: pipeline: fix potential overflow getting the new base time

[GStreamer (bugzilla.gnome.org)]

https://bugzilla.gnome.org/show_bug.cgi?id=708276
  GStreamer | gstreamer (core) | unspecified

           Summary: pipeline: fix potential overflow getting the new base
                    time
    Classification: Platform
           Product: GStreamer
           Version: unspecified
        OS/Version: All
            Status: UNCONFIRMED
          Severity: normal
          Priority: Normal
         Component: gstreamer (core)
        AssignedTo: gstreamer-bugs at lists.freedesktop.org
        ReportedBy: ylatuya at gmail.com
         QAContact: gstreamer-bugs at lists.freedesktop.org
     GNOME version: ---


Clock changes where 'now' is smaller than the start_time result
in negative values for the new base time.
>From gst_pipepline_update_base_time:
start_time=0:00:00.251270779, now=24:32:21.246680292, base_time
24:32:20.995409513
start_time=0:00:00.171604615, now=0:00:00.000000000, base_time
5124095:34:33.537947001

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