NowCaster video live broadcast system based on MPEG-4 and H.264

1. Product Overview

The H.264 / MPEG-4 AVC video compression standard is a standard issued jointly by the ITU and MPEG standards. Compared with the traditional MPEG-2 encoding standard under the same picture quality, the H.264 encoding standard is H.264. 264 saves an average of 64% of the transmission code stream compared to the previous generation encoding standard MPEG2, and saves an average of 39% of the transmission code stream than MPEG4 ASP. This is the result of more than six years of work by hundreds of outstanding experts around the world, and another truly revolutionary breakthrough in video encoding technology since MPEG2

In response to the needs of customers, Beijing Ruide Video Technology Co., Ltd. has launched the NowCaster streaming media live broadcast system. Its prominent technical core is to achieve a delay of less than 500ms; support transmission based on MPEG-4 / H.264 format; penetrate firewall Strong ability; unique cascade technology and other advantages. Many customers have used NowCaster to achieve operations during the World Cup, supporting thousands of users, and the operation is very stable and smooth, which has been praised and praised by customers. Nowcater is suitable for distance teaching, video conferencing, IPTV, etc. The overall architecture of the live broadcast system is B / S mode, which consists of three parts, NOWSTREAM (acquisition coding end), NOWCASTER (publishing server end) and NOWPLAYER (client) .

2. Topology diagram of live broadcast system

3. System composition description

NOWSTREAM is the supporting software for the Yingying HVC400 MPEG-4 encoding card. After the video and audio source captures the real-time encoding of the live server through the HVC400, the live stream is pushed to the NowCaster publishing server, and then the NowCaster forwards it to the NowCaster publishing server in a different city. Distribution and management. NOWCASTER has a platform software with powerful management functions. It has functions such as channel management, user management, and permission setting. The transmission mode between collection and release can be both push and pull transmission (as shown above), NowCaster also has a unique cascading function, which is a point-to-point transmission between different cities, but within a city It can realize one-to-many transmission, that is, to achieve multicast, which can save a lot of network resources, and allow different cities to receive real-time, clear and smooth video and audio streams. The client software is NOWPLAYER. In addition to providing a client program (standard OCX that can be embedded in a web page), SVN Digital Technology also provides a standard Windows DLL. The OCX control is suitable for use in any development environment, and the DLL also provides VC and The DELPHI example program is very convenient for users to develop their own receiver software.

4. Let me introduce the technical applications of NOWSTREAM, NowCaster and NOWPLAYER

1) NOWSTREAM (as shown in the figure below) can support up to more than twenty kinds of coding rate from 28K to 6M, suitable for any network environment application.

2) NOWSTREAM pushes live streaming to NowCaster's parameter setting interface. As shown in the following figure, NOWSTREAM has: channel setting information such as channel name, port number, user name, password, etc. After setting this information, it is pushed to the NowCaster server. Now NowCaster will perform login verification to let NOWCASTER determine whether to allow the live stream Be released (this needs to be set in the background).

3) NowCaster is composed of two parts: one is the NOWCASTER publishing platform software, which must be enabled to receive the live video stream pushed by NOWSTREAM and publish it. The second is the background management center, which manages the live streaming terminal (Nowstream) and the client (Nowplayer) separately, and implements functions such as release verification and login verification.

â‘ NowCaster release platform software, used to set the port number to be monitored, the port number of NowCaster must be consistent with the port number to push the live stream to the NowCaster and release.

â‘¡This is the NowCaster management background interface, which provides management operations on channels and users. For specific applications, please refer to the instruction manual.

4) With the collection terminal and the publishing server, a powerful live broadcast system can be formed. Users only need to install the NOWPLAYER client receiving software to receive real-time clear and smooth live streaming from the publishing server, as shown below.

V. System advantages

1) Adopt standard B / S framework, completely based on Web mode, and can run on Intranet, LAN and private line network.

2) Unique cascade technology.

3) Adopt the most advanced MPEG-4 / H.264 hardware coding technology, fully support multicast (Multicast), the use of multicast technology can greatly reduce the burden on the server, no matter how many connected users can receive the ideal live broadcast effect Multicast technology is currently the most ideal streaming media transmission method!

4) Support one server multi-channel encoder, with strong system expansibility, you can add channels at any time, and the implementation is simple.

5) Support separate collection and release system structure.

6) Support the function of recording programs regularly, and record live content into MPEG-4 / H.264 format files.

7) Receiving with Yingying Nowplayer can realize hardware decoding and output to TV for viewing.

8) Realize live broadcast with almost no delay (less than 500ms).

9) The core transmission technology has a strong function of penetrating the firewall.

10) Support the management of viewing rights, and allow or restrict the designated clients to watch programs.

11) Both the publishing server and the collection workstation use the service mode, and there is no need to worry about power-off and restart. The watchdog program guarantees that the service will always run normally and realize the real unattended operation.

12) Support network connection adaptive function. When the network is abnormal, the publishing server can automatically disconnect the collection workstation; when the network is normal, it can automatically restore the connection to maximize the stability of the system.

13) A single publishing server supports 1000 concurrent streaming live tasks, fully satisfying carrier-class applications.

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