How to reproduce a video with mp4 codecs in Ubuntu 20.04

Problem:

When you play a video (.mp4 format or extension) appears this error: “MPEG-4 ACC decoder, H.264 (Constrained Baseline Profile decoder are required to play the file, but are not installed”

Solution:

To solve it, you can install packages using the Terminal.

Step by step:

1. Open a Terminal by pressing Ctrl + Alt + T.
2. Install the packages needed:

   sudo apt-get install ubuntu-restricted-extras
   sudo apt-get install libavcodec58  ffmpeg
   

3. Log out and log in again.

Source:

https://askubuntu.com/questions/214421/how-to-install-the-mpeg-4-aac-decoder-and-the-h-264-decoder