This script detects if a video has a 4:3 aspect ratio and automatically adjusts it to 16:9 (wide).

It is designed for libraries with older 4:3 content, stretching them to 16:9 without manual intervention. The script aligns with my preference for a simple mpv configuration to fit this straightforward use case.

Simply place boxtowide.lua in the corresponding mpv scripts location of your operating system:

• Windows: %APPDATA%\mpv\scripts\ or C:\users\USERNAME\AppData\Roaming\mpv\scripts\
• Linux: ~/.config/mpv/scripts/ or /home/USERNAME/.config/mpv/scripts/
• Mac: ~/.config/mpv/scripts/ or /Users/USERNAME/.config/mpv/scripts/

config/mpv
│   input.conf
│   mpv.conf
│
└───scripts
        boxtowide.lua