How to play MP3 and DVD video on Xubuntu 12.10

By default, we cannot play MP3 or DVD movie on standard installation of Xubuntu 12.10. We need to install additional packages in order to play MP3 and some others audio video formats on Xubuntu 12.10. Xubuntu, as well Ubuntu does not includes the multimedia codecs to play MP3. But we can easily install ubuntu-restricted-extras to enable supports to various audio and audio file formats. This command will also install flash player on Xubuntu 12.10 as well.