With the continuous development of digital TV, the demand for high definition is imperative.
H.264 is a new generation compression standard. Compared with MPEG-2, its algorithm is more complete, can achieve higher compression efficiency, and can more effectively realize high-definition encoding; AVS is a digital with independent intellectual property rights and formulated by China. Audio and video source standards can achieve a high compression ratio equivalent to H.264. Therefore, based on existing facilities, operators use high-efficiency encoding methods such as H.264 and AVS to transmit more high-quality content, greatly reducing the cost of high-definition programming in cable, satellite and telecommunications networks.
The following program describes the application of high-definition coding in digital cable networks, digital wireless (MMDS, satellite transmission, etc.) networks, terrestrial digital TV networks, and IP networks.
solution
The main products involved in the solution are: Compute E801 encoder and VS400 video server
'S computer communication system. Among them, E801HD is a high-definition encoder that uses H.264MPEG4-AVC compression standard technology, supports high-definition SD, standard-definition video, stereo analog balanced audio, and supports IPout;
The server not only supports MPEG-2 and DVB-ASI standard input and output, but also supports IP input and output and H.264 / AVS compression standard.
The plan is as follows:
E801HD encoder
1. High performance compact encoder, fully comply with H.264 / MPEG4-AVC standard
2. Support HD SDI video and audio, analog YPbPr, standard definition composite video, stereo analog balanced audio, support IPout
3. HD video input format SMPTE-296 / SMPTE-274
4. Support the multiplexing of MPEG4 video and audio compressed data streams, support DVB standard packaging
5. Audio encoding supports MPEG-1Layer2 format
6.H.264 / MPEG4-AVC video data is directly output through IP encapsulation mode; MPEGTSoverIP
7. IP encoding output meets UDP protocol
8. The resolution can reach 1920x1080x59.94i / 50
Integrated broadcast system (VS400 video server)
The computer broadcasting integrated broadcasting system makes the DVB hard disk broadcasting system into the third generation (video server-storage broadcasting system-integrated broadcasting system), which is based on the mature "storage" broadcasting system to provide support for a variety of The comprehensive broadcasting platform of the business and the safe broadcasting are the basic starting points. The integrated playout system using BTS VS400 video server not only supports the input and output of MPEG-2 and DVB-ASI standards, but also supports IP input and output and H.264 / AVS compression standards, in the inherent storage space and transmission bandwidth. Store and transmit more high-quality programs.
The design of the integrated broadcast system is based on the "separation of editing and broadcasting" security mechanism. The following is the structure diagram of the integrated broadcast system using the video server 1 +1 hot standby:
From the point of view of system structure, the system is divided into two parts: program production and broadcast, to avoid interference between each other. The system is based on the separation of editing and broadcasting. It consists of two parts: a content management platform and a broadcasting platform. Among them, the content management platform includes collection workstations, recording servers, editing workstations, management workstations, order editing workstations, order review workstations, log workstations and content servers. The broadcast platform includes video servers, broadcast control workstations, upload workstations and code Devices such as stream switchers. The uploading workstation is responsible for finding the file to be uploaded from the program library, copying the program from the program library to the broadcast library, it is the bridge between the communication content management platform and the broadcast platform.
The comprehensive broadcast platform with separate editing and broadcasting separates the production and broadcast links of the program to ensure the safety of broadcast. In addition, the system provides a complete set of solutions for the collection, editing, storage, management, query, ordering, reviewing, and broadcasting of digital TV program content, and can adjust the workflow according to the settings of different personnel and departments of the TV station to build the closest Broadcast platform for user needs. On this basis, TV stations can successfully develop value-added services such as interactive TV on-demand and digital program insertion DPI.
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