The current IPTV is more understood from the perspective of broadband operators trying to develop network audio and video services, and less talk about the application of IPTV as a technology form in other industries. The evaluation of IPTV interactivity is also based on the comparison with digital TV. The two-way transformation of digital TV network is difficult to achieve in China. However, as a new technology, IPTV is one of the two-way features. It also has many other features. The most important aspect is the true value of IPTV, which is capable of constructing a low-cost and highly flexible TV system platform. It is because of low cost that so-called "private television stations", as well as so-called "podcasts" and even "visitors" can emerge.
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In addition, the flexibility of IPTV is significantly better than that of traditional TV stations. It is very easy to expand and add channels. The system can be remotely grouped, and can easily realize live broadcast of graphics and multimedia, and share Internet resources. In industries other than radio and television and networks, many of the goals that need to be built to build closed-circuit television are now fully achievable using IPTV technology. In these occasions, IPTV has different application goals and different scales, and technical requirements have their own characteristics, and the cost advantage of IPTV is a common feature.
There is a huge market for IPTV industry applications. Banks can establish an internal IPTV system for publicity and employee training; schools can establish campus IPTV applications, provide teaching and conference broadcasting, entertainment, advertising, etc.; IPTV for supermarkets and stores can be used for promotion and shopping guide; and rural party members and cadres The remote training system can adopt IPTV technology; the distance education for rural teenagers can also adopt the IPTV platform and so on. A notable example is that due to the impact of the 9/11 incident, the United States continues to strengthen its anti-terrorism system. A so-called killer application of IPTV is to use a network broadcast technology to build a large-scale network TV platform that is spread over buildings and outdoors. Used for the release of emergency anti-terrorism information.
The following describes the application of IPTV in the advertising industry, the digital signage network, and analyzes its application characteristics.
Digital signage network
Traditional public media and outdoor media mainly use static bulletin boards, light boxes, posters, etc., and the attraction of the audience has been deeply explored, and the space for improvement has been very limited. The TV media has always dominated the family. If it is applied outdoors, the effect of advertising will be significantly improved, but obviously the cost is a major problem. In fact, in the 1970s, foreign countries appeared in STORE TV (in-store TV). Nowadays, such media have been used in China, and the use of DVD devices is usually used to realize the transmission of video and audio content. Since the playback devices are all separate and cannot implement centralized control, it is impossible to determine whether the advertisement content is normally played or whether the content being played is replaced, which has no obvious advantage compared with the traditional distributed static media.
By adopting IPTV technology, by constructing a network-based multimedia platform, a completely centralized management system can be realized, and a new generation advertising network integrating playback, control and monitoring can be realized. This form of network playback has been widely applied abroad, and is called "Digital Signage". Chinese is currently translated into "digital signage". Since it is possible to play a specified content in a specified manner at a specified time and at a designated place, it is a narrower broadcast system that is more customer-specific than broadcasting, and propagation is more effective. In foreign countries, digital signage is booming in buildings, airports, subways, shopping malls, campuses, hotels and other places.
Digital signage involves technologies such as digital multimedia compression, processing, storage, transmission, network interconnection, libraries, embedded players, flat panel displays and many more. The development of its application is largely due to the significant cost reduction of flat panel displays. The rapid development of plasma and LCD TVs has greatly reduced the cost of building a video network. On the other hand, broadband networks make multimedia transmission possible. Broadband IP networks, digital satellite networks, mobile TV networks, and cable broadband networks can easily perform high-speed transmission of multimedia, especially video. Moreover, due to advances in compression technology, the bandwidth occupied by images of the same resolution is also decrease greatly. It can be seen that the digital signage system is a typical IPTV application.
System practice
The basic function of IPTV is to transmit and play digital media files. Compared with the traditional film and television production process - mining, editing, reviewing, broadcasting, and storing, there is a lot of them. As an IPTV, the digital signage is the same. The difference is that the playback that was originally controlled (or selected) by the viewer becomes a centralized control by the administrator or the system automatically plays according to the program schedule.
Specifically, the digital signage system is composed of a management center, a media network, a media player, a display, and the like.
The digital signage system is a network system that can manage a large number of players. Due to the complexity and complexity of the system, it is impossible to complete it independently by a certain supplier. It needs to be completed by system integrators, network providers, software developers, player manufacturers and display manufacturers. The project practice introduced by the author is the responsibility of the system integrator, software developer and player provider. The cooperation with network providers and display providers has realized a comprehensive function and performance on the WAN. Complete digital signage system.
In this practical project, the centers are set up in Beijing and Shanghai respectively, forming a remote disaster recovery system that is backed up with each other. The player is deployed at a branch of a bank in Shenzhen and four hotels, as well as the Xiamen Convention and Exhibition Center. The player accesses the Internet through 1Mbit/s to 2Mbit/s ADSL broadband.
On the playback side, the advertisement, news, and live information are fully integrated into a plasma screen for playback. The multi-region feature of the system allows information to be displayed in different positions on the screen through video, pictures, scrolling subtitles, logos, clocks, and the like. A set of well-ordered videos can be played in a loop, and the pictures can be continuously updated according to a certain set frequency and transition effect. The subtitles can be played cyclically in a periodic manner, and different areas do not interfere with each other, and can be stacked transparently. The effect is vivid and attractive. All of this information can be pre-arranged, including the layout and the material to be played, so that it is unattended! It can also be temporarily changed, and release some major news, notices, good news, etc., directly into the system for real-time playback! The original audio and video material and picture material do not need to be converted and can be used directly.
At the central end, a web-based digital signage management system can be accessed through the network. Through this system, you can manage all the players in Shenzhen and Xiamen, which is equivalent to managing different channels. It is very easy to add and delete a channel, which is difficult for traditional TV stations. In the system interface, we can detect the working status of each player, and can see what the player is playing. For the working player, it can be remotely controlled remotely, including instant update of content (subtitles, pictures), changing the play mode, adjusting the system volume and so on.
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