AspectRatio

An aspect ratio expressed as a fraction with numerator and denominator values, reduced to lowest terms. Used for the sample (pixel) aspect ratio and the display aspect ratio of a video track. For example, a 720x576 anamorphic track has a sample aspect ratio of 64 / 45 and a display aspect ratio of 16 / 9. A video track can declare an aspect ratio in two independent places, and MediaConvert reports each one where it was found rather than choosing between them. The ratio declared by the container appears on the video track itself, and the ratio declared by the video essence appears under codecMetadata. When a file declares an aspect ratio in only one of the two places, the other is null; when it declares both and they disagree, you can compare them and decide which to use.