[Bug 734617] 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

--- Comment #1 from Jan Schmidt <thaytan at noraisin.net> 2014-08-11 14:16:01 UTC ---
Created an attachment (id=283102)
 View: https://bugzilla.gnome.org/attachment.cgi?id=283102
 Review: https://bugzilla.gnome.org/review?bug=734617&attachment=283102

videodecoder: Call the child class finish() function on stream changes

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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