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The video industry shows several major trends. One is to go from SD to HD, the next step is 4K, the next 4K will be the standard configuration of TV; the second is from single-screen to multi-screen, from a single TV screen to mobile phone, tablet, multi-screen interaction; To the on-demand interactive, socialization; Fourth, fragmentation, with the rise of the mobile Internet, smart phones become the user's essential terminal, online video viewing through mobile phones has been very common, and will soon become the mainstream. 
Once upon a time, the biggest challenge for mobile video was bandwidth. After China issued a TD-LTE license in December 2013 and an FDD license to Telecom Unicom in February 2015, the 4G construction is bound to accelerate. As fast as 100 Mbps, the bottleneck of mobile bandwidth will no longer exist, and traffic costs will rapidly decline. As you can see, the demand for real-time transmission of corporate video and personal video is erupting.
Relevant data show that mobile video users have exceeded 300 million and will be a major gold mine for mobile Internet. For operators, as a builder and owner of 4G networks, they will have the opportunity to grasp this opportunity and tap new services to take the initiative in the era of mobile video. At the same time, the emergence of new cross-screen live services has also brought operators a series of problems.
Carrier's Video Road
The three major operators started their video services as early as the 2G era. The typical case was the 2008 Beijing Olympic Games, a national celebration event. China Mobile used the video live technology of Sunac to realize the Olympic Games video at a lower bandwidth. Mobile phone transmission. In March 2011, China Telecom established Tianyi Video, taking the lead in opening up the company’s corporate operations. In 2014, China Telecom launched a heavyweight product called “Yueme†and completed the first commercial deployment of 4K Ultra HD iTV in China.
In August 2012, China Mobile set up an internet video research group and announced on the same day that it had provided TD-LTE licenses with high-definition video services for mass users, and released 4G video brands "and i horizons." It is reported that as China Mobile's 4G video brand, its characteristics are high-definition, multi-screen, starting, and open. In 2014, China Mobile and its affiliate HKUST launched a smart voice product, Consonance and Rhythm, to revitalize video and other data services through voice. 
China Unicom is more in cooperation with OTT, such as iQiyi, Sohu, etc., to jointly deploy traffic operations. At the same time, China Unicom is even more active in its new video services. In the current live video live concerts, popular live entertainment programs such as the “China Good Voice†concert and Tao Yu’s Shanghai “Rhapsody Rhapsody†concert are all live in China. Unicom provides network technical support. With high-speed and stable 3G/4G networks, China Unicom has gained rich operating experience in mobile live broadcast, multi-screen interactive and other aspects.
Multi-screen live broadcast of new industries
In China, the most popular entertainment star is undoubtedly, and every concert that is a “popular star†attracts tens of thousands of enthusiastic fans. At the same time, on-demand video sites have reached tens of millions of times. In the mobile Internet era, a large number of fans who did not go to the scene, but also want to be able to use fragmentation time, watch live concerts in real time. For celebrities, an event that may cost up to 10 million yuan is also expected to further expand the audience through the Internet, enhance their influence and enhance business value.
It is conceivable that traditional concerts rely on ticket revenue and a single business model sponsored by the sponsors, which will change under the impact of the mobile internet. Mobile multi-screen live broadcast technology will be able to maximize the potential of star and concert, through the Internet to realize the diversification of O2O cash. For example, fans send virtual flowers to stars, and the market value is immeasurable. According to reports, at the end of last year, three popular stars, Wang Feng, Brilliance Yu, and Xiao Jingteng's concerts used cross-screen live broadcast technology.
For multi-screen live streaming, high-definition, no-delay, and non-stopping video is the basic viewing experience. Operators have already seen this huge opportunity to solve these problems and will enable operators to get a rich cake in the interactive entertainment industry chain. Moreover, not only the entertainment industry, but also in the fields of large-scale live events, live events, mobile video surveillance and new media applications, multi-screen live broadcast technology has a lot of use, thus providing mobile video services for operators in the 4G era. Open up a new world.
Bandwidth is still a bottleneck
Watch high-definition, no-delay, no-latency mobile video, in theory, 4G network bandwidth is sufficient. In particular, the three major operators have invested heavily in building wireless networks. In 2014, China Mobile completed the construction of 700,000 4G base stations in a year. This year, it still invested more than 700 billion yuan to improve the construction of 4G networks. China Telecom’s 4G construction investment this year Also reached 61 billion yuan, of which the main investment spent on base station equipment procurement. 
Investment is required to pay off, especially for the three major operators that are controlled by the SASAC and are already listed. Although huge amounts of network investment can bring about the increase of bandwidth, the investment return rate must also be given a big question mark. The introduction of new technologies is an important direction. For example, Mr. Liao Xiaobin, former chief engineer of Guangdong Unicom, tried to reduce the number of base stations through superconducting technology, and saved costs such as lease, construction, operation, and maintenance of base station sites. However, no specific actions have yet been seen.
Moreover, the actual transmission rate of 3G/4G is closely related to the strength of signal coverage and personnel density, and the requirements for network transmission are also very high. This not only depends on the problems that the investment can solve, but also depends more on flexible transmission coding techniques to ensure the user's basic viewing experience.
The current mainstream method is to compress the video during transmission in order to reduce the transmission bandwidth. "In video compression, transmission, storage, playback and other aspects, video compression technology determines the user experience." Zhu Rongguo, chairman of Sunac World, once said. In August last year, the company released the video compression technology TIVC 7 of independent intellectual property rights, which caused a sensation in the industry. Zhu Zaiguo said at the time that according to the TIVC 7 savings of 60% of broadband resources and cost calculations compared to H.264, only 4G services, the three major operators could save over 30 billion yuan in network construction investment each year. 
According to reports, unlike the H.264/H.265 core technology concept, TIVC7 is a high-compression video codec technology, which has higher performance and economic value in the Internet field, and is more capable of complex video and interactive sports information. Video can reduce the number of play buffers and traffic costs. "The demand for bandwidth is endless, and the outbreak of mobile video services brings huge bandwidth cost to operators, which brings high pressure on users' traffic costs. The industry's demand for high-strength compression is even stronger."
With mature and leading streaming media technology, based on a video live platform for independent research and development of video encoding and decoding technology, Sunac World has helped China Unicom to achieve "China Good Voice" Taipei concert and Shenzhen concert to achieve high-quality mobile multi-screen live broadcast.
It can be believed that in the cross-screen live broadcasting area, video transmission technology will be an important helper for 4G network capabilities and help create a more perfect user viewing experience.