Generate ffmpeg command lines from OO perl

 The Media::Convert package provides an API that generates ffmpeg
 command lines to convert audio and video assets from one format to
 another.
 .
 It is meant as a perl library, but ships with a simple command-line
 binary (mc-encode) which can handle a subset of the API and can
 convert/transcode video or audio assets from one format to another
 using recommended settings for the target codec.