Due to the Ubuntu’s policy about non free formats on default, this operating system comes with no support to media like MP3 (which can be required to deal with FFmpeg) and DVD, Flash Player or Java. Despite of that, You can still get support of this features by installing third party package.
Open terminal and depending on system, you are using type
sudo apt-get install ubuntu-restricted-extras
sudo apt-get install kubuntu-restricted-extras
sudo apt-get install xubuntu-restricted-extras
sudo apt-get install lubuntu-restricted-extras
To be able to play DVD, install libdvdread4 package