Premiere Pro doesn't have a direct "clipping mask" tool like some other software. However, you can achieve the same effect using several methods. The best approach depends on your specific needs.
Method 1: Using Track Matte Key
This is generally the preferred method for creating a clipping mask effect in Premiere Pro. This method uses the Track Matte Key effect to make one video clip conform to the shape of another.
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Place your video clips on separate tracks. The clip you want to appear through the mask (the masked clip) should be on a higher track than the clip that will define the mask (the mask clip).
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Select the masked clip.
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Apply the Track Matte Key effect. Find this effect under Effects > Video Effects > Keying.
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Choose the mask clip. In the Effect Controls panel for the Track Matte Key effect, choose the mask clip from the Matte dropdown menu.
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Adjust settings (optional). You may need to fine-tune the settings of the Track Matte Key effect, depending on the properties of your clips.
This process effectively masks the upper video clip to the shape of the lower clip, creating a clipping mask effect. This is directly supported by multiple sources (Adobe Community Forum).
Method 2: Using an Opacity Mask with the Pen Tool
This method uses an opacity mask to control the visibility of a clip. This offers more control over complex shapes than simply using the shape tools.
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Select your clip in the Timeline.
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Open the Effect Controls panel.
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Add an Opacity effect. This can typically be found under the Effects Controls panel for your chosen clip.
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Select Free Draw Bezier (the Pen tool) under Opacity. This applies a mask to the Opacity effect.
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Use the Pen tool in the Program Monitor. Add points to create your desired mask shape. (Adobe reference implies this method, although not explicitly explained in detail).
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Adjust feathering and other settings (optional). Fine-tune your mask for a smoother look.
This creates a mask that controls the opacity of your clip. You can effectively use this to limit the visible area of your clip to a custom shape.
Method 3: Using Shape Masks
For simple shapes, using the built-in shape masks is a quick and straightforward approach.
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Add a shape layer (Ellipse, Rectangle, etc.) above your clip.
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Apply the Track Matte Key effect to your clip.
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Set the shape layer as the matte source.
This creates a mask based on the pre-defined shape.
Remember to adjust settings like feathering to refine the mask's edges for a smooth transition. Various tutorials on YouTube and other sites provide visual demonstrations of these techniques (YouTube Example).
