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Almost nobody hits the camcorder’s Record button at the precise instant when the action begins, or stops recording the instant the action stops. Life (not to mention animals, geysers, and children) is just too unpredictable.
Most of the time, of course, you’ll trim out the boring stuff in the Event browser before you add it to the storyboard. Sometimes, though, you’ll discover—only after you put the clips into the storyboard, of course—that you didn’t get the clip-editing process quite right. Maybe the shots are still too languorous, and should be shorter. Or the shots are too quick, and it’s going to be hard for your audience to figure out what’s going on.