[Bug 739281] video-blend: correct improper logic calculations

[GStreamer (bugzilla.gnome.org)]

https://bugzilla.gnome.org/show_bug.cgi?id=739281
  GStreamer | gst-plugins-base | unspecified

--- Comment #23 from Vineeth <vineeth.tm at samsung.com> 2014-11-02 15:56:45 UTC ---
:)
Okey first let me write test cases for all the scenarios mentioned above..

Then probably everything will clear u guess

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