Track Matte Video Inside Text
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Step 5: Obviously with this much movement, the video layer will not fill the entire screen. To compensate, press the S key to bring up the Scale property and resize the layer until it fills the screen during the entire duration of the clip. In my example a value of 300% works fine.
Now it is time to place the video inside the text. To do this, we’ll use the Track Matte feature. We’ve used Track Mattes before in this article, and really, it is a great feature. Track Mattes can use the luminance or alpha channels of a layer as traveling mattes or masks for other layers. Pixels that have higher values (more white), will be more transparent, while pixels with lower values are less transparent. Most of the time, Track Mattes are high contrast black and white images, and in our example, we are set because we are using white text on a black background.
Step 6: In the Modes column, change the Track Matte setting for the video layer to Luma Matte “Text Pre-Comp”.
What you should see the video appear inside the text. Because of the blinking cursor we created last time, when the cursor blinks and the text goes black, the video appears in the cursor area just like in the opening credits.
Step 7: As an extra touch, you could have the text revert to the original white at the end of the piece by duplicating the Text Pre-comp layer, moving it to the top of the Timeline layer stack, turning visibility on, and setting the In Point to the appropriate spot.
In the next installment, we’ll use expressions to create multiple layers and have them rotate in the background.
Source: Digital Media Online, Inc.
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