[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 #3 from kevin <kevinbing.song at gmail.com> 2014-12-15 04:30:09 UTC ---
Our hardware use physical address and has alignment requirement. The video
buffer is allocator by one hardware and will used by another hardware. We can
get physical address as we implement our allocator. But our hardware also need
know the video padding to interpret the input video buffer. So we need know the
actual video padding.

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