Tag: IPTV DVR This article refers to the address: http:// The development of IPTV system technology is inseparable from the development of network technology. The main technologies involved in IPTV include: video codec, streaming media, digital rights management, CDN, multicast, electronic program guides and middleware technologies, which are still in the process of continuous development. IPTV technology can be widely used in services such as video on demand, switched broadcast video services, and cable digital TV services. The first is the application of IPTV technology in traditional VOD services. Cable TV operators in the United States, Canada and Europe have fully launched the cable TV VOD service, and this service has been well received and welcomed by cable TV users. However, although this VOD service is ultimately transmitted to end users in MPEG2 TS streams, it uses IPTV technology, and the use of IPTV technology has promoted the development and popularity of such VOD services. Prior to the maturity of IPQoS and Gigabit Ethernet technology, VOD video streams for cable TV VOD services, from video servers to edge video servers or edge QAM modems, must use SDH or SONET networks. This method is costly and difficult to meet the bandwidth growth requirements of VOD services. Therefore, at that time, the cable TV VOD service could only be a good concept and a good-looking demonstration, which was difficult to be commercialized on a large scale. Due to the development and maturity of IPTV technology, the cable TV VOD service has been able to use Gigabit Ethernet to transmit VOD video streams from the video server to the edge QAM modem in IP mode (MPEGoverIP), and many vendors have received IP packets and The conversion function of completing the IP packet to the MPEG2 stream is placed in the edge QAM modem. This network architecture greatly reduces the transmission cost of the VOD stream, improves the scalability of the system, and enables large-scale commercial use of the cable TV VOD service. Second is the application of IPTV technology in switched broadcast video services. More and more professional cable TV channels, according to the 80/20 rule, 80% of users will basically watch 20% of these hundreds of programs, and the remaining 80% of the programs are generally only watched by 20% of users. If all the hundreds of programs are transmitted "broadcast" to all cable TV users, it will undoubtedly occupy a large amount of spectrum resources and network resources. The switched broadcast video service is to designate some of the 80% of the programs as switched broadcast video service programs. These programs will not be transmitted to all cable TV users, but will be transmitted to all cable TV front ends and points. At the front end, once a cable subscriber selects a channel program that is designated as a switched broadcast video service, the channel program will be broadcast to all users of the service group in which the cable subscriber is located. A service group consists of all optical cable users connected by an optical node or an optical node and several adjacent optical nodes. The maturity of IPTV technology makes the implementation of switched broadcast video services easy and cost-effective. The program of the switched broadcast video service can be transmitted to the Gigabit switch of the cable TV front end through the Gigabit optical Ethernet through IP multicast. Once the channel program of a switched broadcast video service is selected by the user, the Gigabit switch will send the program to the edge QAM modem associated with the user and thereby broadcast to all cable subscribers of the associated service group. Furthermore, the application of IPTV technology in digital TV services. The IPTV system technology enables cable digital TV services to provide new forms of services, and cable digital TV DVR services are one of them. This service allows cable operators to push some video programs to STBs with cable DVR capabilities for cable TV users to view at convenient time. It also allows users to record programs that are or will be played. For this kind of DVR business to be commercialized on a large scale, the security of the program is the most critical factor. Since the conditional access technology based on connection and transport layer encryption is used for DVR services, it is inconvenient, flexible, and not secure enough. Therefore, DVR services must use DRM technology based on encryption of the content itself. The DVR video program pushed by the cable TV operator is generally encrypted and packaged and stored by the DRM technology of the IPTV before being pushed, and the DVR program recorded by the user is generally used in the user STB after the conditional reception and decryption, and then used. IPTV DRM technology encryption packaging and storage. IPTV terminal technology is also a key part of the IPTV service. Its functions include three aspects: First, support current LAN or DSL network transmission, receive and process IP data and video streams; Second, support MPEG-1, MPEG-2, MPEG-4, WMV and Real video decoding, support video On-demand, TV screen display and digital rights management; finally, support HTML web browsing, support for online games, etc. All functions of the IPTV network terminal are based on high-performance microprocessors, and the embedded operating system constitutes a basic support platform for real-time decoding of chips and pure software real-time decoding (Codec) applications. At present, IPTV network terminals are basically divided into two categories due to the use of different embedded OSs, and they have their own characteristics in terms of technology and market application prospects. - Embedded WinCE terminal. The biggest feature of WinCE is that its API is compatible with Win32, which is beneficial to the development of WinCE applications using Windows environment. In addition, this player can also run directly on the WinCE operating system. Many off-the-shelf Windows components can be applied to network management and video stream control functions on the terminal. These are fully shared with DSL and low bandwidth environments like MMS. In terms of the excellent results of Windows Media, it cannot be said that it is a shortcut for terminal development. -- Embedded Linux terminal. Such terminals are often centered on a dedicated multimedia microprocessor, complemented by an Ethernet interface and a video interface. The multimedia microprocessor itself not only has embedded RISC (Reduced Instruction Set CPU) running system software and application software, but also has MPEG-2 or MPEG-4 real-time decoding function chip, which introduces linuxOS and necessary video and auxiliary interface drivers. After the program, it becomes a complete IPTV network terminal application environment. SHAOXING COLORBEE PLASTIC CO.,LTD , https://www.fantaicolorbee.com