Represents the "MH" entry of the media play parameters dictionary object.

It is an optional entry defined as part of the PDF 1.0 specification.

It contains a MediaPlayParametersMhBeElement.

For definitive details see:.

The ISO PDF Specification, ISO 32000-1:2008 PDF 1.7; Table: 279, page 496.

The ISO PDF Specification, ISO 32000-2:2017 PDF 2.0; Table: 290, page 621.

The MH entry references a must-honour play parameters dictionary carrying settings that must be satisfied for playback, such as volume, repeat count, and duration.