DVB has initially identified three next-generation candidate commercial video codecs to prepare for advanced 4K and 8K broadcast broadband TV, namely AV1, AVS3 and VVC. Work will now begin to assess the technical compliance of the candidate video codecs and to develop a draft DVB specification.

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Introduction of DVB

Digital Video Broadcasting (DVB) is a series of publicly recognized standards for Digital TELEVISION maintained by “DVB Project”. The DVB Project is an industry group of more than 300 members, It is established by the European Telecommunications Standards Institute, ETSI, The European Committee for Electrotechnical Standardization (CENELEC) and the European Broadcasting Union, The Joint Technical Committee (JTC) of EBU. The DVB organization logo is shown in Figure 1.

Figure 1. LOGO of DVB Project

The DVB standard is now used in most countries and regions of the world. Figure 2 shows the standards used by countries for digital television terrestrial broadcasting. In the figure, light blue represents DVB-T standard, dark blue represents DVB-T2 standard, green represents ATSC standard, pink red represents ISDB-T standard, and yellow represents DTMB standard (China’s standard). As can be seen from the figure, the countries using ATSC are mainly distributed in North America, while the countries using ISDB-T are mainly distributed in South America. China uses the independent DTMB standard, while the rest of the regions all adopt DVB-T standard.

Figure 2. Standard usage range of digital television terrestrial broadcasting

A commercial request to add new video codecs to the DVB toolkit was approved

The DVB project, which fosters advanced 4K and 8K services, has approved commercial requirements for the next generation of video codecs. The investigation of the technical compliance of the candidate codecs with commercial requirements will now begin and a draft specification will be developed. The proposed solution is also being reviewed for compliance with the INTELLECTUAL property policy of the DVB project.

The three next-generation commercial video codecs initially identified by DVB are AV1, AVS3 and VVC.

Pioneering work

“DVB is a pioneer in the development of media distribution systems and is preparing for future advanced 4K and 8K systems,” said Peter MacAvock, DVB Project Chairman. The industry is watching our work closely, and we are confident that DVB will once again break new ground in TELEVISION technology. We encourage all companies with support in this area to join us.”

By dictating how next-generation video codecs are used, DVB hopes to enable new video experiences, such as 8K, as well as improved accessibility and personalization options. For example, the higher efficiency promised by the new codecs will enable terrestrial broadcast networks to offer more UHD services and greater coverage, while reducing the distribution costs of broadband transmission. Another goal is to take advantage of the consistency of broadcast and broadband transmission to make distribution more flexible.

Business needs

Support for 8K video is one of the key requirements defined, with resolution up to 7680×4320 pixels. High dynamic range (HDR) and high frame rate (HFR) are also supported.

In order to improve the transmission mode of 4K video, the new codec is required to save at least 27% data rate in 4K video compared to existing HEVC codecs, and at least 30% in 4K in broadband applications. Codecs are also required to improve compression efficiency at low resolutions, potentially reducing the impact of media services on the environment when transmitted to devices that do not require 4K or 8K resolutions.

To achieve flexibility in distribution, specifications including transport stream transport and DVB-DASH stream are required. To aid in workflow and implementation convergence, codecs selected for broadcast and streaming media need to be as similar as possible. In addition, in order to facilitate interoperability between DVB-I streaming media services and mobile devices, consistency points adopted by other relevant industry organizations should be aligned.

The first specification in 2022

Preparatory technical studies have been underway for several months. Work will now begin on assessing the technical compliance of candidate video codecs and developing draft DVB specifications, initially focusing on VVC.

The specification release is expected to cover all three candidate codecs in 2022, subject to successful verification of technical and intellectual property compliance. The specification, including VVC, is expected to be released for the first time in early 2022.

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