Recently, a new hotspot - IPTV - is attracting more and more attention. IPTV is also known as network TV, using IP broadband networks, integrating Internet, multimedia, communication, etc., providing users with live TV, video on-demand, online browsing, etc., etc., using multiple interactive services such as live TV, video on-demand, online browsing. Users can use IPTV services through "IP set-top box TV" or personal computers. Since IPTV is a business based on broadband network users, it is in 2003, narrowband users account for mainstream Chinese markets, and IPTV has no survival soil. Since 2003, after several years of large-scale broadband upgrade, transformation and efforts to broadband users, the company has been eager to grow, and the current broadband users in China have exceeded 10 million, preliminary High-speed Internet provides users and technical foundations for IPTV services. In the second half of 2004, the IPTV business of the computer was gradually surfaced. The first is that Beijing Communication is in September for network TV, the online TV is worth 30 yuan / month, and after the Hangzhou Netcom announces the opening of the IPTV service, and the program service of 9 TV channels is available in the early days. At the 2004 China International Communications Equipment Technology Exhibition, China Telecom, China Telecom, held in Beijing, October 26 to 30, 2004, China Telecom, IPTV will be the development focus of China Telecom is paying attention to, and China Netcom also performs IPTV performance. I have a big enthusiasm, and I am currently carrying out the test of technical programs, and I will not be introduced soon. However, although the current IPTV has been widely favored by operators, the investment boom of related industry chain vendors has been driven, and consistently believes that has a beautiful future, but in 2004, it is still in the "painting big cake concept" stage, network restrictions , The uncertainty of technical specifications, the contrastic factors such as the unbelive product system have made IPTV a truly development thereof. However, it is precisely because of the uncertainty, further stimulation and driving the entire IPTV market continues to heat up. The ancients: Workers must be good, and must be a prostitute. The IPTV market should develop and must choose solutions for national conditions and network technical conditions. It is understood that the current Chinese network condition is more complicated, such as telecom has the broadest user, known as broadband access ADSL's highest home network bandwidth can only reach 2M, and the currently opened downlink bandwidth is only 512K, and a few places have opened 1M bandwidth The XDSL speed of the telecommunications network can be used to reach more than 3M; some domestic hotels, new communities, high-end homes, and large-scale local area networks have implemented 100 metricians, wired, Great Wall broadband, etc. IP broadband network bandwidth. It can reach 8M or more. How to make the program adapt to the needs of all of these networks, is the most important indicator of whether the program is mature. A good solution can achieve different media formats for different bandwidth. At present, the mainstream media format on the market mainly includes three series: MPEG1 / 2/4 series, Real series, Microsoft series. The MPEG 4 and MPEG 2 has great development potential, and H.264 is most likely to be the future IPTV mainstream format standard. The reason is: From the user's perspective, easy to use, safe and reliable, big screen, high-definition is its requirements for IPTV, so "top box TV" way will be the mainstream of IPTV development, its largest competitor is cable TV . With the gradual development of digital TV in the future, the proportion of high-definition programs grows larger and larger, and the demand for users will be high. High-definition media format (MPEG 2/4) is an inevitable result of user needs. The REAL series and Microsoft series are manufacturers format, not fully open coding format standard, so it is difficult to get extensive support from IPTV set-top box manufacturers, currently a large number of mainstream set-top box vendors use standard MPEG series formats. For the MPEG1 format, it has passed a heyday. At present, very popular DVD formats use MPEG 2 coding standards.
