Add new port multimedia/mlt.
MLT is an open source multimedia framework, designed and developed for
television broadcasting. It provides a toolkit for broadcasters, video
editors, media players, transcoders, web streamers and many more types of
applications. The functionality of the system is provided via an assortment
of ready to use tools, XML authoring components, and an extensible plug-in
Submitted by: Alberto Villa <villa.alberto at gmail.com>
Approved by: miwi (mentor)