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Flash's vector graphics aren't always the fastest way to deliver animations. If you're using a 2D graphics framework like Starling to build a fast 2D game, or if you're planning to export an animation to HTML5 and Canvas, you'll need to make a sprite sheet of key frames in your animations. Load the sheet and its index into your application and you've got a fast way of delivering graphics that are tailored to a target screen. Select the movies you want to convert to sprites, and export a sequence of frames as sprites for use by Starling or by your own code.