Abstract: Methods and apparatuses for processing media data for transmission in a data communication medium and for use with data processing systems. One exemplary method processes readable content stored in a stream or set of data which contains samples for presenting a presentation (e.g. video only or audio only or video and audio together) at a plurality of scales of scalable content. A second stream is derived from a first stream, where the second stream contains references to the first stream for use in selecting data, for an operating point within the scalable content, from the first stream. In one aspect of this method, references contained in the second stream are accessed to transmit or store the data from the first stream.

Abstract: A sequence of video images represented using multiple related timelines can be searched by identifying a first point on a first timeline associated with the sequence of video images, wherein the sequence of video images is comprised of one or more samples, determining a search range on a second timeline associated with the sequence of video images based on a positive offset and a negative offset associated with the one or more samples, and searching the second timeline based on the determined search range for a second point that corresponds to the identified first point. A display offset can be associated with each of the samples comprising the sequence of video images, wherein one or more of the display offsets can comprise a negative value. Additionally, the search range can be based on a maximum positive display offset and maximum negative display offset associated with the one or more samples.

Abstract: A sequence of video images can be represented using multiple related timelines by generating a first timeline identifying a decode order associated with a sequence of video images and a second timeline identifying a display order associated with the sequence of video images, wherein the sequence of video images is comprised of one or more samples. The first and second timelines can be correlated based on an offset, which represents a time period by which decoding precedes display. The sequence of video images can then be played in accordance with the correlated first and second timelines. Additionally, the decode order in the first timeline can differ from the display order in the second timeline. A revised offset between the first and second timelines can be determined after the sequence of video images has been edited and the first and second timelines can be correlated based on the revised offset.