Input information
Output Command
Press "generate command"...


This calculator it's made in order to calculate a correct display aspect ratio for an anamorphic video, for example, you have a 720×480 DV video with an 1:1 storage aspect ratio and you want the video to be displayed as 16:9 display aspect ratio, in order to look correctly you need to use MP4Box to change the data/flag inside the video that handles the aspect ratio information to “32:27”, as you can see this is not “16:9” and that’s because MP4Box utilizes a very peculiar way to handle the aspect ratio information and it’s not the standard known aspect ratios that you’ll find on most DVDs boxes, it uses fractions to avoid non integer numbers (decimals or floating point values) so that’s the reason you have to manually calculate this values.


MP4Box is a multiplatform command line tool that serves as a multimedia packager, with a vast number of functionalities: conversion, splitting, hinting, dumping and others. You can download and read the documentation in the following links.

Download Precompiled Binaries

Some extra information


This handy calculator is brought to you by Rodrigo Polo – Special thanks to Komeil Bahmanpour – – Nice looking HTML thanks to Bootstrap.