What is the term for the ratio of vertical to horizontal pixels within a video?

The term that describes the ratio of vertical to horizontal pixels within a video is known as aspect ratio. This ratio indicates how the width of the video relates to its height, typically expressed in a format such as 16:9 or 4:3. Understanding aspect ratio is crucial for video production, as it affects the composition of the frame, how the video is displayed on different devices, and aesthetic preferences.

In contrast, pixel density refers to the number of pixels within a given area, which is more relevant to screen resolution than to the aspect ratio itself. Frame rate denotes the number of frames displayed per second in a video, impacting motion smoothness but not the relationship between width and height. Resolution defines the total number of pixels in a video (e.g., 1920x1080), representing the overall clarity and detail of the image but not specifically the ratio of height to width. Therefore, aspect ratio is the precise term that encapsulates the concept of vertical to horizontal pixel measurement.