Pitivi is a video editor built upon the GStreamer Editing Services. It aims to be an intuitive and flexible application that can appeal to newbies and professionals alike. For the list of dependencies, look at pitivi/check.py - "Hard" dependencies are required for Pitivi to function properly - "Soft" dependencies are recommended for an optimal user experience (packagers should add them as recommended or required packages). Your involvement is what keeps this project moving forward. See the "contributing" section of http://www.pitivi.org to get started.