Re: Animate background for text in After Effects CS3 by Jason Mettler on Sep 18, 2011 at 5:00:46 am
Use a solid with a mask feather out quite far. Use the 'wiggle' expression on the Opacity. To get there, highlight the layer, Alt + click on the stopwatch, and then type the expression: wiggle(1,5)
Experiment with the numbers.
Once you have the look your looking for, duplicate the layer a few times and move them around and off-set their position in the timeline so the flickers are different.