Could you please explain what do you mean by "does the rotator accept the buffer time"?
I believe the HTML and client scripts [of the rotator] will be rendered in the same amount of time, no matter if the rotator contains flash video or not. So, when the rotator is initialized the animation will start immediately. You could choose the type of the rotator and entirely customize it when RotatorType="FromCode" is used: http://demos.telerik.com/aspnet-ajax/rotator/examples/default/defaultcs.aspx
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