[Bug 734617] New: videodecoder: Call the child class finish() function on stream changes

[GStreamer (bugzilla.gnome.org)]

https://bugzilla.gnome.org/show_bug.cgi?id=734617
  GStreamer | gst-plugins-base | git

           Summary: videodecoder: Call the child class finish() function
                    on stream changes
    Classification: Platform
           Product: GStreamer
           Version: git
        OS/Version: Linux
            Status: NEW
          Severity: normal
          Priority: Normal
         Component: gst-plugins-base
        AssignedTo: gstreamer-bugs at lists.freedesktop.org
        ReportedBy: thaytan at noraisin.net
         QAContact: gstreamer-bugs at lists.freedesktop.org
     GNOME version: ---


Call the subclass finish() function when a new STREAM_START
event is received, otherwise derived decoders (libav) that queue
data internally can output stale data when the new segment is
activated. Calling finish gives them the chance to drain.

Also reset last_timestamp_out on a segment change, as is done
for the other sequence tracking variables, to avoid confusion
over new timestamp timelines when a seamless segment change
happens

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