Creates a new media file for the given filename.
This is a utility function that converts the given @filename to a GFile and calls [ctor@Gtk.MediaFile.new_for_file].
filename to open
a new GtkMediaFile playing @filename
ConstructionException GTK+ fails to create the object.
See Implementation
Creates a new media file for the given filename.
This is a utility function that converts the given @filename to a GFile and calls [ctor@Gtk.MediaFile.new_for_file].