MP4Box Aspect Ratio Fix

About

This calculator computes the correct PAR (Pixel Aspect Ratio) for anamorphic video. For example, a 720×480 DV file stored with a 1:1 pixel ratio needs its MP4 container flags changed to display correctly at 16:9. MP4Box uses reduced fractions internally, so the result is values like 32:27 rather than the familiar 16:9.

MP4Box

MP4Box is a multiplatform command-line tool for multimedia packaging — conversion, splitting, hinting, dumping and more.

Download precompiled binaries

• Mac & Windows — videohelp.com/tools/mp4box
• Linux — tkn.tu-berlin.de
• Documentation — gpac.wp.mines-telecom.fr

Terminology

• DAR — Display Aspect Ratio
• SAR — Storage Aspect Ratio
• PAR — Pixel Aspect Ratio

Credits

By Rodrigo Polo — rodrigopolo.com. Special thanks to Komeil Bahmanpour — blog.komeil.com.