[Bug 741501] videopool: should update video alignment after change it

[GStreamer (bugzilla.gnome.org)]

https://bugzilla.gnome.org/show_bug.cgi?id=741501
  GStreamer | gst-plugins-base | 1.4.1

--- Comment #1 from kevin <kevinbing.song at gmail.com> 2014-12-15 01:42:47 UTC ---
Created an attachment (id=292726)
 View: https://bugzilla.gnome.org/attachment.cgi?id=292726
 Review: https://bugzilla.gnome.org/review?bug=741501&attachment=292726

patch to fix the issue.

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