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With the continuous development of network technology, the information transmitted by the network is becoming more and more rich, from simple text information and data, to voice and images. Currently, it is developing in the direction of streaming media information composed of video and audio.
With the construction of the broadband metropolitan area network, users need more broadband-based applications, such as e-commerce and video on demand, distance education, and advertising services. For broadband streaming media, the core is the streaming server. Choosing a streaming server is very important for building a streaming media system.
The core of the streaming media system is still on the server
In the streaming media network system, the program source, streaming media server and user terminal equipment are the main application links of the system, and the multimedia communication network (IP network) is the link that provides the communication connection.
Information flow collection equipment includes TV cameras, stereo recorders, VCDs, etc. The collection object is the program source. The collected video / audio stream is converted into a video / audio code stream after being digitized and compressed, and sent to a streaming media server. The streaming media server stores, manages, and distributes the video / audio stream. The IP network can be in the form of multicast, and the video / audio code stream in the streaming media server is distributed to each user terminal device through path finding. The user terminal device may be a multimedia PC or a TV set-top box. After decoding, the code stream can be transmitted to the display for users to watch.
Streaming media server to withstand the amount of data
In fact, in addition to hardware, the streaming media server also needs to install intelligent streaming media transmission and control software such as ThirdspaceOVS. Among the solutions that use MPEG media streaming, SGI's streaming server is the leader in the industry. It is a scalable, high-bandwidth, high I / O data throughput ccNUMA architecture server. It can be used as a tool for TV stations to manage media files, video on demand, multimedia conferences, distance education, and telemedicine. SGIOrigin3000 server single system image (SSI) can be expanded from 2 64-bit RISC CPUs to 512 CPUs, and the operating system is 64-bit IRIX6.5. The I / O bandwidth of the modular Origin3000 server can increase linearly as the number of CPUs increases. For example, the peak value of the I / O bandwidth of the Origin3200 server with 8 CPUs is 11.2GB / s, and the peak value of the I / O bandwidth of the Origin3400 server with 32 CPUs is 44.GB/s. The Origin3800 with 512 CPUs has a peak I / O bandwidth of 716GB / s.
One of the Origin streaming media server hardware can provide extremely high I / O bandwidth, mainly using the hypercube ccNUMA architecture. Structurally, the ccNUMA server can be viewed as a system consisting of two basic components, a node and a router. Four RISC microprocessors, a cache, main memory, directory memory and Hub can be installed on the node. Hub is an AISC chip, used to connect CPU, memory, I / O interface and router. The router is actually a dedicated chip for the crossbar (Crossbar). Conceptually, each router chip is equivalent to a vertex of the hypercube, and each fiber optic cable between the vertices is equivalent to an edge of the hypercube. The basic structure of the hypercube is router interconnection.
To evaluate the bandwidth of a system in full-duplex operation, it is usually to examine the halved bandwidth of the system. In the hypercube structure, when the number of dimensions increases from n to n + 1 dimensions, the number of vertices will double, while the bisection bandwidth of each CPU remains constant. The bus bandwidth of multi-processing servers is halved with the increase of the system size, so when the number of CPUs increases to a certain number, it will cause serious bottlenecks, while the bandwidth of ccNUMA servers may increase with the number of CPUs. Linear growth. So it is an excellent "bandwidth machine". It is suitable for streaming media network as a streaming media server.
Schematic diagram of streaming media network system
Origin3000 server's XIO can be connected to PDDI, HIPPI, GSN networks, and can also be connected to digital video, video ports, its transmission speed can reach 716GB / s, and its PCI can be connected to ATMOC12, ATMOC2, Fibre Channel ports, Gigabit ports Connected to the UITRaSCSI port, its transmission rate can reach 532GB / s. The server greatly reduces the time to create, store and use streaming media applications, and supports Oracle and Informix databases. The server can transmit applications on the IP network at various bit rates of 28.8Kb / sec to 15Mb / sec, and can also perform flexible Web playback of digital video / audio streams in a multicast manner. The program can be embedded in any Web application through NetscapeNavigator or MicrosoftIE browser, and the broadcast control can be realized by HTML, Java or VB script language.
The SGI streaming server can also operate in clients with mixed network topologies. It supports Apple, Macintosh, Windows NT / 2000 and various UNIX clients. The SGI streaming server is intelligent and can automatically select the appropriate video encoding format and bit rate according to the bandwidth, so as to best transmit it to the selected interface. It can connect with clients such as PC or set-top box and SGI streaming server.
The SGI streaming media server can transmit streaming media programs to a large number of heterogeneous clients on the IP network in real time, or it can be transmitted to the video database for future playback. It is also an important part of the SGIMediaCommerce suite for online content transactions, and can also be delivered to ISPs and ASPs for electronic transactions.
At present, SGI's servers are widely used in world famous media and telecommunications companies, such as AOL, YAHOO, Disney, CNN, etc.
SGI also has a large number of VOD users in China, such as Guangdong Telecom Bureau, Fujian Telecom Bureau, Henan Telecom Bureau, Chongqing Telecom Bureau, Jiangsu Post and Telecommunication Bureau, Shandong Post and Telecommunication Bureau, Shanghai Online, Kunming Telecommunication Bureau and many other telecommunications units.
The Gigabit Metropolitan Area Network infrastructure built by Kunming Telecom Bureau can explain the VOD service provided by the SGI broadband multimedia application platform. In the Kunming broadband multimedia communication network, one SGIOrigin3400 server is used as the central media server, three SGIOrigin2100 servers are used as Web application servers, database servers and billing servers, and one SGIOrigin200 server is used as the edge server. The Origin3400 server is connected to the 2TB SGITP400 RAID disk array through Fibre Channel and switches, while the Origin200 server is connected to the 9x36GbdeTP9100RAID disk array. With the increase in the number of urban areas, the number of Origin200 edge servers and TP9100RAID disk arrays can also be increased so that users in each area Can enjoy VOD service. The aforementioned broadband multimedia network infrastructure can also be used by ISPs and ASPs to provide end users with various broadband multimedia applications such as distance education, telemedicine, multimedia conferences, and media commerce.
SGI also provided 33 SGIOrigin streaming media servers and 84 TP9100 storage systems to a telecommunications company for 20,000 users to receive VOD services. A total of 5,565 data streams could be developed. The SGI streaming server can provide huge streaming throughput and is an important condition for providing users with high-quality broadband streaming services. The close combination of it and ThirdspaceOVS software constitutes an advanced metropolitan area network broadband streaming solution. After the Thirdspace OVS software is installed on the client and client, the streaming system can provide MOD services to a large number of users.
Streaming media focuses on structure
February 25, 2024