[Bug 785027] New: videorate: Outputs too much data on segment updates

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=785027

            Bug ID: 785027
           Summary: videorate: Outputs too much data on segment updates
    Classification: Platform
           Product: GStreamer
           Version: git master
                OS: Linux
            Status: NEW
          Severity: normal
          Priority: Normal
         Component: gst-plugins-base
          Assignee: gstreamer-bugs at lists.freedesktop.org
          Reporter: bilboed at bilboed.com
        QA Contact: gstreamer-bugs at lists.freedesktop.org
     GNOME version: ---

When an "update" segment arrives in videorate, the next timestamps is resetted,
causing a huge amount of duplicate (and late) frames to be outputted.

To reproduce, using the gst-validate media suite:
gst-launch-1.0 -v uridecodebin
uri=file://$HOME/gst-validate/gst-integration-testsuites/medias/defaults/mp4/fragmented_nonseekable_sink.mp4
! identity name=before silent=False ! videorate ! fakesink name=after
silent=False

What comes in to videorate:
* segment start:0, stop:2s
* buffers from 0 to 2s
* segment start:0, stop:4s
* buffers from 2s to 4s
* etc...

What comes out of videorate
* segment start:0 stop:2s
* buffers from 0 to 2s
* segment start:0, stop:4s
* buffers from 0 to 2s /!\
** The problem is right here. Those buffers are all duplicates of the incoming
2s buffer and are all late.
* buffers from 2s to 4s

Any element after videorate that assumes that timestamps are increasing is
going to have a looot of problems.

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