This class represents the media duration dictionary. This is definitively detailed in:.

The ISO PDF Specification, ISO 32000-1:2008 PDF 1.7; Table: 281, page 498.

The ISO PDF Specification, ISO 32000-2:2017 PDF 2.0; Table: 292, page 623.

A media duration dictionary specifies the duration of media playback. The S entry names the duration subtype: I for intrinsic duration (use the clip natural length) or T for a specific time duration given by the T entry.

The T entry holds a timespan dictionary that specifies the duration value when S is T. Together, S and T allow authors to set a fixed playback duration that may be shorter or longer than the clip intrinsic length.

System.Object
    WebSupergoo.ABCpdf14.Elements.Element
       WebSupergoo.ABCpdf14.Elements.MediaDurationElement