In daily life, many people have had such an experience when watching online videos, online competitions, and concerts: obviously there are their favorite stars or wonderful game shots, but they are often missed because the guide switch shots are not timely. This is because the current mainstream video playback is still dominated by a fixed perspective experience, and it is impossible to achieve the more immersive and free viewing experience pursued by the public. During the Beijing Winter Olympics, through cutting-edge technologies such as 8K ultra-high definition and free viewing technology, the audience can not only obtain better picture quality, but also find their desired viewing angle and the best follow-up viewing position by rotating and switching, and realize the immersive viewing experience of "thousands of people and thousands of faces".
Ordinary live TV broadcasts often have problems such as blurred scenes, inconspicuous contrast between chiaroscuro and shades, and single channels. 8K Ultra HD technology, which is at the forefront of the current video technology development, can bring unparalleled viewing experience to the audience from the perspective of ultra-clear details, light and shade levels, brilliant colors, sound quality effects and so on. This is mainly due to the fact that the 8K pixel resolution is 4 times that of the 4K format, which has a leap forward compared with 4K in terms of skin, texture, light and texture, so it can bring the audience a more realistic, shocking and more immersive audiovisual enjoyment.
Immersive viewing effect, in addition to clearer picture quality, the free conversion of viewing angle is also an important support. According to the relevant technical personnel of Beijing Radio and Television Station, by adding a synchronization mechanism in the multi-channel signal video stream, so that the signals transmitted by different paths are consistent in time, it can be realized that the audience can act as a guide for themselves, choose different camera angles according to their own preferences, and watch the event in multiple dimensions and angles.
The free-view technology developed by Beijing International Cloud Broadcasting Technology Co., Ltd. is based on the 5G network, using the multi-camera position deployed on the scene of the venue to provide any angle video information around the entire venue, which is convenient for the audience to find their desired perspective and the best follow-up viewing position in a rotating way. With 4K multi-track broadcast-level image synchronous acquisition coding and picture synthesis technology as the core, the free perspective technology presents a three-dimensional effect of 360-degree surround viewing angle of on-site characters or objects, so as to realize the interactive experience of "thousands of faces" of live pictures.
According to Zhang Pengzhou, the "multi-version production" function of cloud broadcasting provides further support for "thousands of people and thousands of faces". That is, the same front-end signal, different teams can produce different versions online in real time to meet the personalized needs of new media. At the 2022 Beijing Winter Olympics, Cloud Broadcasting will provide free-angle shooting services for two Winter Olympic snow sports. Combined with 5G and the overall intelligent cloud network capabilities, the public can receive a certain angle of the field signal through their own choice, or provide the effect of fixed frame surround or slow motion surround at any time through preset templates operated by the cloud system, so as to realize the application of strong interaction in the 5G era. Cloud broadcasting services for the 2022 Beijing Winter Olympics not only realized the free-view shooting service provided by a Chinese company for the Olympic Games for the first time, but also the first time that the free-view signal provided by a Chinese company was broadcast to the world as a public signal for the Olympic Games.
Text/Beijing Youth Daily reporter Zhao Tingting
Photo / Beijing Youth Daily reporter Hao Yi
Editor/Peng Zhang
![The live broadcast of the Winter Olympics will use the world's first 5G+8K ultra-high-definition broadcast vehicle[fig]](data:image/gif;base64,R0lGODlhAQABAIAAAP///wAAACwAAAAAAQABAAACAkQBADs=)