Have you ever experienced live streaming where you can zoom in or out of local details on your screen at any time? The upcoming 5G+8K HD video mobile app "8K APP", which will be launched at the end of this month, can realize these technologies. Not only that, "8K APP" is also the world's first video player that supports 8K interactive experience, which can not only watch 8K ultra-high-definition channel content synchronously, but also realize "black technology" that increases the sense of presence such as naked-eye 3D.
During the Winter Olympic Games, the country's first TV channel to provide 8K services to a wide audience, the Beijing Radio and Television Station Winter Olympic Documentary 8K Ultra-HIGH-definition Experimental Channel, will provide technical support for the all-round documentary coverage of the Beijing Winter Olympic and Paralympic Games.
"8K" technology, do not miss every detail of the wonderful moment
There have been industry insiders analyzed that the human eye can capture the image field of view range of about 120 degrees, through scientific calculations, when the height of the screen is about 0.75 times, in order to achieve the maximum image field of view range, at this distance to see the high-definition picture needs 8K resolution to meet. "8K" HD video means that it can provide the audience with clearer picture quality, wider viewing angles, richer picture information and more powerful color expression. So how is this achieved? The answer is that the screen contains more pixels.
"8K" HD video brings the "7680X4320" Ultra HD resolution of 4 times the picture resolution of 4K and 16 times the 1080P, that is, more pixels will be included in the same size of the picture. The range that used to have 4 pixels has now become 16 pixels. If you say, under 4K technology, a steel frame snowmobile needs 3 million pixels to render. In 8K video, then, the same steel-framed snowmobile is presented at 12 million pixels. More pixels can store more color and detail information, improving the perception from multiple aspects of color gamut and color depth. At the same time, the frame rate of 8K TV programs has reached 50 frames, so that the screen playback is infinitely close to the ultra-high-definition picture presentation of the real vision of the human eye.
The establishment of the 8K ultra-high-definition test channel system is interlocking and very complex, including pre-shooting, post-editing, special effects production, audio production, transmission link, integrated broadcast control, terminal display and other links. Among them, the color grading link in post-production is particularly necessary and important for controlling the quality of 8K images. Through the 8K review color grading system, the technicians will perform color science matching, exposure and color temperature adjustment, black level adjustment, face fill and softening, picture enhancement, subject light enhancement, hand skin tone adjustment, picture edge processing, stylized color grading including detail enhancement, etc., and adjust some detail defects to highlight the theme of the original picture.
Mobile phone TV outdoor large screen, are to let the audience personally visit the Winter Olympics scene of the "portal"
Ou Xiaoxiao, a staff member of the Information Network Management Center of Beijing Radio and Television Station, once demonstrated the operation of "8K APP" with a low-end model commonly seen on the market. The live broadcast content is a picture of a small pavilion in Qianlong Garden, and Ou Xiaoxiao has achieved picture size adjustment through the operation of two fingers, and the zoom range includes 20% to 200%. Ou Xiaoxiao confidently said: "If there is a plaque on the pavilion, this mobile phone can also be seen clearly." "A low-end model has already met the basic conditions for running 8K APP, so the audience does not have to worry about whether the old mobile phone in their hands can ride the "8K" ultra-high-definition video clipper.
The stage of "8K" ultra-high-definition video is not only limited to mobile phones in every hand, but also exists in the TV set and a variety of outdoor large screens in the home. It is understood that the program signal of the 8K ultra-high-definition test channel is accessing ordinary families through channels such as Gehua Cable and IPTV, and home users with 8K ultra-high-definition TV are expected to watch the ultra-high-definition live broadcast of the Beijing Winter Olympics. And during the Winter Olympic Games, Beijing Radio and Television Station will also promote the construction of 8K ultra-high-definition centralized control platform, urban outdoor 8K large screen, 8K demonstration community, with more than ten 8K ultra-high-definition outdoor large screens in Beijing's important scenic spots, institutions and universities landing, during the Winter Olympics, citizens can "personally visit" the Winter Olympics anytime and anywhere to cheer for the Chinese team.
5G plus 8K video transmission, so that the audience and the moment of winning the championship is only 18 milliseconds away
The strong support of 5G networks has made 8K ultra-high-definition video dissemination more powerful.
8K Ultra HD video has a higher screen resolution and faster refresh frame rate, which means that 8K Ultra HD video requires more storage space and faster transfer speeds. According to statistics, a minute of 8K Ultra HD video requires 194G of memory, how to achieve 8K Ultra HD video low latency fast propagation in this clear situation?
The 5G network gives a perfect answer sheet, starting from the two aspects of transmission speed and transmission direction, helping 8K ultra-high-definition video transmission. It is known that the transmission of 8K ultra-high-definition video requires more signal circulation, 5G opens the way for it, "widening" the signal transmission channel, as if two lanes become four lanes: more signals can pass through the same "road section" in the same time, and the transmission speed is naturally shortened.
5G technology, on the other hand, enables beamforming: the signal is propagated in a directional manner according to demand. If the signal propagation in the 4G era is like throwing a stone in the calm lake, the signal spreads evenly from the center of the circle to the surrounding areas. Then, the signal propagation in the 5G era is "the shortest straight-line distance between two points", avoiding bends and twists, and avoiding the signal dispersing in unnecessary directions. Reduce the useless work, concentrate the "firepower" at a certain point, and the transmission speed is bound to increase.
The emergence of the "5G+8K" group of king bombing partners has made the live viewing that cannot be achieved due to the impact of the epidemic less regrettable. As long as there is a 5G mobile phone, every spectator can celebrate the moment of winning the championship with "zero delay"; everyone can experience multi-camera, dead-end live broadcast, the effect is better than the live viewing; with a 200% magnification to review every detail of the game, appreciate the athletes' flowing figure movements and powerful muscle lines.
In response to the strategic concept of the state and Beijing Municipality on the development of the ultra-high-definition video industry, in April 2021, Beijing Radio and Television Station set up an 8K project special class to fully promote the preparation of the 8K ultra-high-definition test channel for the Winter Olympics. After nearly a year of efforts, Beijing Radio and Television Station has completed the three main tasks of core system construction, content production reserves and 8KApp research and development of the 8K project, formed more than 20 domestic independent knowledge achievements, produced more than 50 hours of 8K boutique programs, accumulated more than 100 hours of 8K materials, and successfully completed the preparation and broadcasting of the pilot channel. Especially in the case of the epidemic affecting the live viewing of the game, the high standard of the channel's opening meeting meets the requirements of the audience to watch the game online, better drives people to pay attention to and integrate into the Winter Olympics, and fully highlights the style of the "City of The Two Olympics".
In the future, the "Beijing Radio and Television Station Winter Olympic Documentary 8K Ultra HD Experimental Channel" will take the broadcast of the Winter Olympics Ultra HD Event as an opportunity to continue to carry out research and application of ultra-high-definition and high-tech video new technologies, link urban outdoor large screens, demonstration community medium screens and personal terminal small screens, and realize cross-screen integrated communication in different scenarios. Promote the construction of 8K ultra-high-definition centralized control platform, urban outdoor 8K large screen, 8K demonstration community, promote 5G cloud broadcast backpack, AVS3 video reception technology, multi-local real-time connection system and other 13 service ice and snow events, to achieve multi-terminal user experience and cross-screen integrated communication, so that citizens can learn about the Winter Olympics, participate in the Winter Olympics, and realize their dreams at their doorstep.