#23 mlt uses filename extension instead of MIME or magic

[Dan Dennedy]

Usage of filename extension is old school and unreliable especially as file name extensions change (.e.g. ts -> m2t, ogg -> ogv)

FreeDesktop.org defines a universal MIME system called shared-mime-info:

http://www.freedesktop.org/wiki/Specifications/shared-mime-info-spec

The xdgmime software is a reference for how to query the database:

http://webcvs.freedesktop.org/mime/xdgmime/

We should create an alternative to fezzik in the core module that uses MIME to select a producer when unspecified before choosing a default (e.g. avformat).