Methods, apparatus and system for rendering an audio program

A system for rendering an audio program from an encoded bitstream, the system comprising:

• a processor for extracting presentation data from the encoded bitstream, wherein the presentation data is indicative of a presentation of the audio program, and wherein the presentation data corresponds to a set of substream entities;
• and
• a renderer for rendering, based on the presentation data, a first set of object channel frames and metadata corresponding to the set of substream entities,
• wherein the audio program comprises a plurality of substreams that includes the set of substream entities, and wherein the audio program comprises a first audio program frame,
• wherein the first audio program frame is part of a set of object channels and a corresponding first set of object related metadata frames;
• wherein an object channel frame is to be presented by a combination of speakers of a presentation environment, wherein an object related metadata frame of an object channel frame is indicative of a position within the presentation environment from which the object channel frame is to be rendered;
• and wherein the set of object channels is indicative of audio content of at least some of a set of audio signals.