As of version 9.1, Drupal automatically lazy-loads images by default. This functionality adds a
loading="lazy" attribute when outputting an
<img> tag. When the browser sees this, it will not download the image until it enters the viewport. This can save your user (and your web host) gobs on bandwidth by not downloading images that will never be used.
FFMPEG is a free open source command line tool used to convert any video type into any other video type! It's used by the likes of Youtube (who are major contributors), VLC, and many more.