[Bug 734424] videorate produces bogus output when framerate=0/1

[GStreamer (bugzilla.gnome.org)]

https://bugzilla.gnome.org/show_bug.cgi?id=734424
  GStreamer | gst-plugins-base | 1.4.0

--- Comment #10 from Thibault Saunier <tsaunier at gnome.org> 2014-12-09 11:47:39 UTC ---
Created an attachment (id=292379)
 View: https://bugzilla.gnome.org/attachment.cgi?id=292379
 Review: https://bugzilla.gnome.org/review?bug=734424&attachment=292379

videorate: Do not loop forever pushing first buffer when variable framerate

In the case the framerate is variable (represented by framerate=0/1),
we currently end up loop pushing the first buffer and then recompute
diff1 and diff2 without updating the videorate->next_ts at all
leading to infinitely looping pushing that first buffer.

In the case of variable framerate, we should just compute the next_ts
as previous_pts + previous_duration.

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