En Ubuntu:

sudo apt-get install gstreamer0.10-plugins-ugly gstreamer0.10-plugins-ugly-multiverse gstreamer0.10-plugins-bad gstreamer0.10-plugins-bad-multiverse gstreamer0.10-ffmpeg gstreamer0.10-plugins-base gstreamer0.10-plugins-good gstreamer0.10-plugins-ugly gstreamer0.10-plugins-ugly-multiverse gstreamer0.10-plugins-bad gstreamer0.10-plugins-bad-multiverse gstreamer0.10-ffmpeg gstreamer0.10-gl gstreamer0.10-pitfdll libquicktime0 libxine-main1 libxine-extracodecs libquicktime0 libdvdread3 flashplugin-nonfree totem-gstreamer-firefox-plugin unrar