The State Administration of Press, Publication, Radio, Film and Television recently issued the "Notice on Standardizing and Promoting the Development of 4K Ultra HD TV", providing policy guidance for regulating and promoting the healthy and orderly development of 4K Ultra HD TV. Sun Suchuan, deputy director of the Science and Technology Department of the State Administration of Press, Publication, Radio, Film and Television, said in an interview with the reporter of China News, Publishing and Radio and Television that in China, with the development of 4K ultra-high-definition television display terminal market and the development of high-quality program broadcasting technology 4K Ultra HD TV has also entered a new round of development opportunities. The development of ultra-high-definition television involves many aspects, including technical standards, program production, program transmission, terminal reception, and the support and support of relevant technologies, programs, industries and funds. It is impossible to achieve policy guidance and science. Formulate plans, improve technical standards, and do a good job in pilot applications.
4K Ultra HD TV program production and broadcasting test has been carried out
Chang Jian, Director of the Science and Technology and Standards Management Department of the Science and Technology Department of the State Council, told reporters that in recent years, the international 4K ultra-high-definition TV technology and industrial chain are gradually maturing, and TV operators in some developed countries have launched 4K ultra-high-definition TV services. In 2014, South Korea opened the first 4K Ultra HD channel. After that, broadcast and TV broadcasters and network operators in Europe, North America, South Korea and Japan launched more than 70 4K Ultra HD channels based on cable, satellite and IPTV platforms.
Currently, the 4K Ultra HD channel program types that have been launched mainly include sports, movies, TV dramas, news, literature, entertainment, documentaries, etc. Among them, sports programs account for the largest proportion, accounting for 23% of the total; movies, literature, and documentary programs account for Second, they are between 16% and 19%; news programs account for the smallest proportion, only 1%.
Satellite transmission has many unique advantages such as large bandwidth, high speed and wide coverage. At present, most operators of 4K ultra-high-definition channels in Europe, North America, Japan and South Korea tend to use satellite transmission. According to relevant statistics, satellite-based transmission 4K Ultra HD channels accounted for 49% of transmission; 4K Ultra HD channels based on cable, IPTV and OTT transmission accounted for 15%, 24% and 12% respectively; based on terrestrial wireless mode only stayed in transmission test, currently not yet Launch ground wireless 4K ultra HD channel.
Although the number of 4K Ultra HD channels is increasing, it is limited by the 4K Ultra HD program source. Some 4K Ultra HD channels that have been opened are still difficult to support 24 hours a day. For example, the Japanese SkyperfecTv4Kmovie channel is broadcasted 3-4 times a day. The US FashionOne4K channel has 12 programs interspersed every day, each program lasting about 15 minutes.
In China, CCTV and TV stations in Beijing, Shanghai, Guangdong, and Hunan have already conducted 4K ultra-high-definition TV program production and broadcasting tests. Cable TV networks in Beijing, Sichuan, Shenzhen, Guangdong, Hunan, Chongqing and other places have launched 4K experience zone services; China Telecom, China Mobile and China Unicom have successively released 4K ultra-high-definition on-demand and push services; Youku, LeTV, Xiaomi and other manufacturers have also launched 4K ultra-high-definition OTT receiving box. In terms of broadcast form and reception, 4K ultra-high-definition services are mainly based on on-demand and push-based methods, and there is no full-channel 4K ultra-high-definition channel broadcast. Chang Jian said that due to lack of program sources, receiving terminal decoding chips and display device performance limitations, the "4K Ultra HD Program" frame rate is mostly 25P, and the color gamut range is mostly HD color gamut. Most programs are not. It is produced in HDR (High Dynamic Range), so it does not meet the technical standards that 4K Ultra HD TV should have.
Program format and related technical standards need to be improved
Sun Suchuan introduced that China is a big country in broadcasting and television. Considering the wide application of ultra-high definition video coding, high industrial value, and intellectual property issues, China has independently developed video coding technology for 4K ultra-high definition TV applications in recent years, and it has been promulgated in 2016. The "High-Efficiency Audio Video Coding Part 1: Video" standard, referred to as AVS2.0, is the 4K ultra-high definition TV video coding standard in China. In 2017, the State Administration of Press, Publication, Radio, Film and Television released the industry standard for the production and exchange of 4K ultra-high-definition television programs, and standardized the technical format of 4K ultra-high-definition television programs in China. In addition, China is led by CCTV, and relevant research institutions are also working on the research and development of high dynamic range broadcast television industry standards and 3Dudio broadcast television industry standards.
Sun Suchuan said that compared with Japan, Europe and the United States, China's 4K ultra-high-definition TV is still in its infancy, and the development environment, industrial support conditions, program formats and related technical standards have yet to be further improved, and a complete end-to-end industry has not yet been formed. Chain and ecological chain. She believes that there are five problems that need to be resolved. One is the issue of programming. The production of 4K ultra-high-definition programs is large, and the system construction is complicated, and it is difficult to recover costs in the short term. Although some TV stations and production agencies in China have produced some 4K ultra-high-definition programs, the overall production cycle is long, the number of programs is small, and the scale has not yet been formed. At this stage, it is impossible to support the 4K channel for 24 hours without repeating content broadcast.
The second is the transmission problem. The transmission data of 4K ultra-high-definition TV is more than 10 times that of ordinary HDTV. Whether it is transmitted in cable, wireless or satellite, it needs to transform the existing transmission system and configure 4K receiving terminal. On the one hand, it is very nervous. The transmission bandwidth of broadcast television is a huge challenge, and on the other hand it will increase the receiving cost.
The third is the industrial problem. According to the technical development plan, China's 4K ultra-high definition video coding is intended to adopt the AVS2.0 standard, but at present, the domestic industry has not formed a large-scale mature commercial product series.
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