What does the "Scale to Frame Size" option do?

The "Scale to Frame Size" option is designed to adjust the dimensions of a clip so that it fits within the dimensions of the sequence frame without altering the clip’s original resolution. This feature allows for easier editing and arrangement of clips when they have different resolutions, as it will automatically scale the clip to fit the current sequence frame size. This means that after applying this setting, the clip appears larger or smaller on the timeline, but the underlying pixel data and resolution remain unchanged, which ensures that you maintain the original quality of the footage while accommodating the size requirements of your project.

In contrast, the other options do not accurately describe the function of this feature. The enhancement of frame quality from low to high resolution does not occur as "Scale to Frame Size" does not have any upscaling or enhancement capabilities; it merely resizes the clip for visual fitting. Automatic cropping is not part of this option’s functionality; it does not remove any sections of the clip but resizes it. Lastly, recovering lost frames is unrelated to the resizing process and pertains more to video repair or restoration techniques rather than the scaling of clip size.