Described are methods, apparatuses and computer program products for signaling and storing compressed point clouds. Sub-sample entries associated with sequences of sub-samples within sequences of samples may indicate whether sequences of sub-samples were encapsulated alone in a track, without other sub-samples or additional header data. Sub-sample entry types can be indexed at track-level sub-sample description boxes. Point cloud compression coded bitstream component types may be signaled by including respective point cloud unit header information in a codec-specific parameters-related field of track level sub-sample description boxes. Sub-sample information boxes may indicate sub-sample entry indices for respective sub-samples. A flag in such information boxes may indicate the presence of sub-sample description entry indexes. Description index boxes can contain sub-sample description entry indexes in the same container as sub-sample information boxes. Track fragment header boxes can include sub-sample description entry indices that apply to samples of a track fragment.