Install libreoffice-avmedia-backend-gstreamer by entering the following commands in the terminal:
sudo apt update sudo apt install libreoffice-avmedia-backend-gstreamer
Description:
GStreamer backend for LibreOffice
LibreOffice is a full-featured office productivity suite that provides a near drop-in replacement for Microsoft(R) Office. . This package contains a GStreamer backend for LibreOffices avmedia component to play audio/video.
Homepage: http://www.libreoffice.org
Version: 1:6.0.3-0ubuntu1
Section: misc