Understanding Timelines Within MPEG Standards


Today, media content will be delivered via various broadband and broadcast technologies. Although these different technologies have somehow become rivals, their coordinated usage and convergence, by leveraging of their strengths and complementary characteristics, can bring several advantages to both operators and customers. As an example, broadcast TV content will be augmented by on-demand broadband media content to produce enriched and personalised services, like multi-read TV, audio language choice, and inclusion of real-time web feeds. A piece of proof is that the recent Hybrid Broadcast Broadband TV (HbbTV) normal, which aims at harmonizing the delivery and consumption of (hybrid) broadcast and broadband TV content. A key challenge in these rising situations is that the synchronization between the concerned media streams, which can be originated by the identical or different sources, and delivered via the same or different technologies. To enable synchronized (hybrid) media delivery services, some mechanisms providing timelines at the source facet are necessary to accurately time align the involved media streams at the receiver-facet. This paper provides a comprehensive review of how clock references (timing) and timestamps (time) are conveyed and interpreted when using the foremost widespread delivery technologies, like DVB, RTP/RTCP and MPEG standards (e.g., MPEG-two, MPEG-4, MPEG-DASH, and MMT). It's particularly focused on the format, resolution, frequency, and the position within the bitstream of the fields conveying timing data, in addition to on the concerned components and packetization aspects. Finally, it provides a survey of proofs of concepts making use of those synchronization related mechanisms. This complete and thorough source of data will be very useful for students and practitioners curious about media services with synchronization demands.

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