Which of the following is NOT a function of a keyframe?

A keyframe is used to define specific values at certain points in time within a timeline in Adobe Premiere Pro, facilitating the animation of properties over time. This includes functions such as changing audio properties, animating movement, and modifying opacity.

When changing audio properties, keyframes allow for adjustments such as volume levels or pan settings at specific times, creating a dynamic audio experience. Animating movement involves using keyframes to alter the position, scale, or rotation of clips, enabling smooth transitions and visual storytelling. Similarly, modifying opacity through keyframes can create fade-in or fade-out effects, contributing to the overall visual presentation.

Stabilizing footage, however, is an entirely different process that is not dependent on keyframes. Instead of being an animation feature, stabilization is a function that involves analyzing footage to reduce shakes and jitters, which is handled by specific stabilization tools within Premiere Pro. Thus, it does not utilize keyframes in the same way as the other options, making it the correct answer for what does not belong in the context of keyframe functions.