This class represents the movie annotation. This is definitively detailed in:.

The ISO PDF Specification, ISO 32000-1:2008 PDF 1.7; Table: 186, page 407.

The ISO PDF Specification, ISO 32000-2:2017 PDF 2.0; Table: 189, page 493.

This class is always an indirect object because MovieActionElement.EntryAnnotation requires it to be so.

System.Object
    WebSupergoo.ABCpdf14.Elements.Element
       WebSupergoo.ABCpdf14.Elements.AnnotationElement
          WebSupergoo.ABCpdf14.Elements.MovieAnnotationElement

A movie annotation embeds a reference to a movie file at a page location. Note that movie annotations are deprecated in PDF 2.0 in favour of screen annotations with rendition actions.

The Movie entry holds the file specification and playback parameters. The T entry provides a title used by movie actions to locate the annotation by name.