37. The apparatus of claim 34 , wherein the at least one group is indicated in a sample group description box.
37. The apparatus of claim 34 , wherein the at least one group is indicated in a sample group description box. 38. The apparatus of claim 37 , wherein the at least one group of one or more samples of the streamed data is indicated in a sample group description box for the timed metadata track through associating the at least one group of one or more samples of the streamed data with respective timed metadata samples in the timed metadata track.