SMPTE ST 428-7:2014

This document specifies the format of a DCDM Subtitle file. A DCDM Subtitle file contains a set of instructions for placing rendered text or graphical overlays at precise locations on distinct groups of motion picture frames. A DCDM Subtitle File is an integral component of a D-Cinema composition and may be present in Digital Cinema Package (DCP) file sets. Consequently, its design reflects features of other DCP file formats. The DCDM Subtitle file format is not intended for use in streaming applications.