Topic summary
Video formats
Extracted from the Wikipedia article Video.
Aspect ratio
In video, an aspect ratio is the proportional relationship between the width and height of a video screen and video picture elements. All popular video formats are landscape, with a traditional television screen having an aspect ratio of 4:3, or about 1.33:1. High-definition televisions have an aspect ratio of 16:9, or about 1.78:1. The ratio of a full 35mm film frame with its sound track (the "Academy ratio") is 1.375:1.