Why does "ken burns" increase speed going in/out?

If you've used Flash, you know that you can control the motion by 'easing in/out', that is, the constant and consistent motion of a picture or object can be emphasized at the start or end of a tween (move slow and increases in motion speed towards the end, or vise versa).
the ken burns effect shows a normal smooth motion, maintaining consistent speed throughout the whole motion, ONLY in the preview pane. When it is actually rendered, for some reason some photos start their motion really slow. Others start their motion really fast. Why is this and can it be controlled?

Welcome to the forum, Chris.
Yes, the accelerating zoom of Ken Burns is a known problem. Here's another thread discussing it, with some suggestions. Unfortunately, there is no perfect workaround.
Karl Petersen, "jumpy ken burns effect" #1, 11:59pm Sep 17, 2005 CDT
Please complain to Apple so it is fixed.
http://www.apple.com/feedback/imovie.html
Karl

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