A method for generating a bitstream indicative of an object based audio program, wherein the object based audio program comprises a plurality of substreams (411, 412, 413, 414); wherein the bitstream comprises a sequence of containers for a corresponding sequence of audio program frames of the object based audio program; wherein a first container of the sequence of containers comprises a plurality of substream entities for the plurality of substreams (411, 412, 413, 414), respectively; wherein a substream entity comprises data relating to a frame of a corresponding substream (411, 412, 413, 414); wherein the first container further comprises a presentation section; wherein the method comprises - determining a set of object channels indicative of audio content of at least some of a set of audio signals; wherein the set of object channels comprises a sequence of sets of object channel frames; - providing a set of object related metadata (434, 444) for the set of object channels; wherein the set of object related metadata (434, 444) comprises a sequence of sets of object related metadata frames; wherein a first audio program frame of the object based audio program comprises a first set of object channel frames and a corresponding first set of object related metadata frames; wherein an object channel is to be presented by a combination of speakers of a presentation environment, wherein the object related metadata (434, 444) of an object channel is indicative of a position within the presentation environment from which the object channel is to be rendered; - inserting the first set of object channel frames and the first set of object related metadata frames into a respective set of object channel substream entities of the plurality of substream entities of the first container; and - inserting presentation data into the presentation section; wherein the presentation data is indicative of at least one presentation; wherein a presentation comprises a set of substream entities from the plurality of substream entities which are to be presented simultaneously. - determining a set of object channels indicative of audio content of at least some of a set of audio signals; wherein the set of object channels comprises a sequence of sets of object channel frames; - providing a set of object related metadata (434, 444) for the set of object channels; wherein the set of object related metadata (434, 444) comprises a sequence of sets of object related metadata frames; wherein a first audio program frame of the object based audio program comprises a first set of object channel frames and a corresponding first set of object related metadata frames; wherein an object channel is to be presented by a combination of speakers of a presentation environment, wherein the object related metadata (434, 444) of an object channel is indicative of a position within the presentation environment from which the object channel is to be rendered; - inserting the first set of object channel frames and the first set of object related metadata frames into a respective set of object channel substream entities of the plurality of substream entities of the first container; and - inserting presentation data into the presentation section; wherein the presentation data is indicative of at least one presentation; wherein a presentation comprises a set of substream entities from the plurality of substream entities which are to be presented simultaneously.