What is the function of the Pen tool in video editing?

The function of the Pen tool in video editing primarily involves creating and manipulating keyframes, which serve as critical points in the timeline for controlling various parameters of an effect or animation over time. When using the Pen tool, editors can draw paths or create shapes directly on the video layer. This is particularly useful for animating properties such as opacity, position, or effects parameters, allowing for precise control over how these elements change throughout the duration of the video.

By placing keyframes at different points in the timeline with the Pen tool, editors can establish a dynamic motion or effect, such as a gradual fade-in or animated movement along a defined path. This capability to finely tune motion and effects is essential for creating polished and professional-looking video edits.

In contrast, options like cutting clips or merging video clips pertain to more fundamental editing tasks not suited specifically to the Pen tool, as those tasks typically utilize other specific tools designed for such functions. Adjusting audio levels likewise requires distinct tools and methods, separate from the functionalities of the Pen tool. Thus, the Pen tool's unique ability to define and manipulate keyframes underlines its significance in the editing process.