jekyll-aspect-ratio

https://github.com/abethcrane/jekyll-aspect-ratio

This plugin enables the use of a custom Liquid tag {% aspectratio filepath %}, to find the aspect ratio of an image or video file. This can be used for e.g. specifying the flex-grow value of an item to display items of different aspect ratios on one line at the same height, or to separate out horizontal or vertical videos (aspect ratio > or < than 1).