Install gem-plugin-mpeg3 by entering the following commands in the terminal:
sudo apt update sudo apt install gem-plugin-mpeg3
Description:
Graphics Environment for Multimedia - MPEG support
Gem is a loadable library for Pure Data (Pd), which adds OpenGL graphics rendering and animation to Pd. Pd is a graphical programming language and computer music system. . This package provides film/movie decoding using the libmpeg3 library (allowing you to read MPEG-1 and MPEG-2 video files)
Homepage: https://gem.iem.at/
Version: 1:0.93.3-13
Section: universe/graphics