Gavin, this is an effect that can be accomplished in a lot of different ways; masks, effects, & mattes can all be used to create this effect. Here’s one approach.
Create a new comp and create your text. Position your text where you would like it to start. Next, press “Y” to use the anchor point tool and move your anchor point to the center of the letter “O”. Your text will scale from that center now. Press “cntl+y” to create a solid. Select the circle mask tool and make mask the solid so it is constrained by the letter “O”. Place this solid below the text layer. Parent the solid to the text layer. Now place your video as the bottom layer in your layer stack and change it’s track matte to “alpha matte”. Finally, press “s” to access the scale property of the text layer and set up a couple of scale keyframes so it scales up over the entire video screen, revealing your video layer.
One advantage of using this method, is if you change your scale, timing or position of your text layer, because the solid is parented to it, everything adjusts with it.
Here’s a sample project file: 6956_textwipeeffect5.5.aep.zip
Johnny Cuevas, Editor
Thinkck.com
“I have not failed 700 times. I have succeeded in proving that those 700 ways will not work. When I have eliminated the ways that will not work, I will find the way that will work.”
—THOMAS EDISON on inventing the light bulb.