METHODS, APPARATUS AND SYSTEMS FOR SIGNALING PRESELECTIONS

Described is a method of processing a media stream. The method comprises receiving the media stream packetized in accordance with a predefined transport format, wherein the packetized media stream comprises a plurality of hierarchical boxes each being associated with a respective box type identifier, and wherein the plurality of boxes comprise one or more track boxes referencing respective tracks indicative of media components of the media stream; determining whether the media stream comprises a preselection-related box of predefined type indicative of a preselection, wherein the preselection corresponds to a media presentation to a user; and if it is determined that the media stream comprises the preselection-related box: analyzing metadata information corresponding to the preselection-related box, the metadata information being indicative of characteristics of the preselection; identifying one or more tracks in the packetized media stream contributing to the preselection based on the metadata information; and providing the one or more tracks for downstream processing in accordance with the given preselection