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Detailed Introduction of H.265, SVAC, GB / T28181, ONVIF, PSIA

Sep 10, 2017

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Detailed Introduction of H.265, SVAC, GB / T28181, ONVIF, PSIA


Coding technology

What is H.265


     H.264 is ITU-T to H.26x series named after the video codec technology standards. There are two international organizations to develop video codec technology, one is "ITU (ITU-T)", which developed the standard H.261, H.263, H.263 +, and the other is "international Standardization Organization (ISO) "It has developed standards such as MPEG-1, MPEG-2, MPEG-4 and so on. H.264 is a new digital video coding standard developed by a joint video group (JVT), which is jointly organized by two organizations. Therefore, it is both ITU-T H.264 and ISO / IEC MPEG-4 advanced video Encoding (Advanced Video Coding, AVC), and it will become part 10 of the MPEG-4 standard. Therefore, whether it is MPEG-4 AVC, MPEG-4 Part 10, or ISO / IEC 14496-10, all refer to H.264.


H.265 is a new video coding standard developed by ITU-T VCEG following H.264. H.265 standard around the existing video coding standard H.264, retain some of the original technology, while some of the relevant technology to be improved. The new technology uses advanced technology to improve the relationship between codestream, coding quality, latency and algorithm complexity to achieve optimal setup. The research contents include improving the compression efficiency, improving the robustness and error recovery ability, reducing the real-time delay, reducing the channel acquisition time and random access delay, reducing the complexity and so on. H264 can be achieved by using 1 ~ 2Mbps transmission speed 720P (resolution 1280 * 720) ordinary high-definition audio and video transmission.


    H.265 is designed to deliver higher quality network video over limited bandwidth, allowing only half the bandwidth to play the same quality video. It also means that our smartphones, tablet and other mobile devices will be able to play 1080p full HD video online. H.265 standard also supports 4K (4096 × 2160) and 8K (8192 × 4320) ultra-high-definition video. It can be said, H.265 standard to keep up with the network video display "high resolution" of the footsteps.




    SVAC, (Surveillance Video and Audio Coding); SVAC is the first technical standard designed to solve the unique requirements of the security and monitoring industry, and to establish the Chinese public security and crime prevention system. It is particularly important. The SVAC standard will be implemented on May 1, 2011 and will be the preferred agreement for government contracts for all providers participating in the security and surveillance industry.

Protocol standards


     GB / T28181


     GB / T28181-2011 "security control video monitoring network system information transmission, exchange, control technical requirements" by the Ministry of Public Security Science and Technology Information Bureau, by the National Security and Alarm System Standardization Technical Committee (SAC / TC100) centralized, Ministry of Public Security And other units jointly drafted a national standard.


     This standard specifies the basic requirements and security requirements of the information transmission, exchange and control interconnection structure, communication protocol structure, transmission, exchange and control, and the technical requirements of control, transmission flow and protocol interface in the city monitoring and alarming network system. The standard applies to the security design of the alarm monitoring and control system. The system design, system inspection, acceptance and related equipment R & D, production and other information systems can be used.




     ONVIF is committed to the adoption of global open interface standards to promote the application of network video in the security market, this interface standard will ensure that different manufacturers of network video products with interoperability. November 2008, the forum officially released ONVIF first edition specification - ONVIF core specification 1.0. With the video monitoring of the network application, the industrial chain division will be more and more fine. Some manufacturers do a special camera, some manufacturers do DVS, some manufacturers may be dedicated to the platform, and then through the integrator to integrate, to the final customer. This industry cooperation model, has been pressing the industry to provide more and more standardized interface platform.

To this end, in May 2008, by the Bosch Bosch and Sony Corporation announced that they will work together to set up an international open network video product standard network interface development forum, named ONVIF (Open Network Video Interface Forum, open network Video interface forum), and open and open the principle of common development of open industry standards.


    The ONVIF standard defines common protocols for information exchange between network video devices, including device search, real-time video, audio, metadata, and control information. The variety of possibilities that network video products can offer, enabling end users, integrators, consultants, and manufacturers to easily benefit from cost-effective, more flexible solutions, opportunities for market expansion, and lower risks of.


    It is understood that some enterprises and telecom operators have been developed with the relevant industry norms, there are some enterprise alliance put forward some interoperability of enterprise standards. ONVIF is global, the starting point is to develop a fully open standard. The main goal of this standard is to promote the integration of different brands of network video equipment to help manufacturers, software developers and independent software vendors to ensure that the product interoperability, is suitable for enterprise-class market.


    Normative role


    The ONVIF specification describes the network video model, interface, data type, and data interaction mode. And reuse some of the existing standards, such as WS series standards. The goal of the ONVIF specification is to implement a network video framework protocol that enables fully interoperable network video products (including video front-end, video equipment, etc.) produced by different vendors.


    The interfaces defined in the Device Management and Control section of the ONVIF specification are provided in the form of Web Services. The ONVIF specification covers complete XML and WSDL definitions. Each terminal device that supports the ONVIF specification shall provide a Web Service corresponding to the functionality. The server interacts with the client using the SOAP protocol. Other parts of the ONVIF, such as audio and video streams, are performed via RTP / RTSP.


    Regulate the advantages


    Synergy: products provided by different manufacturers, can be through a unified "language" to communicate. To facilitate the integration of the system. Flexibility: End users and integrated users do not need to be bound by the inherent solutions of certain devices. Greatly reducing the development costs. Quality assurance: the ever-expanding specification will be guided by the market, follow the standard but also meet the needs of mainstream users.




    PSIA: (Physical Security Interoperability Alliance) Physical Security Interoperability Alliance. A global alliance of more than 65 security vendors and system integrators is dedicated to driving the security and security of the entire security ecosystem and subsequent IP functions, and was established in August 2008. The goal of the alliance is to create a standardized interface for the hardware and software platforms of the physical security system. The alliance is committed to making IP-based security systems compatible with each other. The goal of the PSIA Alliance is to create a standardized interface for the hardware and software platforms of the physical security system, and is committed to making the different security systems based on IP networks compatible.



    PSIA promotes the development of open standards that involve the physical security technology of the network in all industries, including video, storage, analysis, intrusion and access control. PSIA supports license-free standards and specifications, which are reviewed in an open and collaborative way, as a whole industry. 5 effective working groups, IP video, video analysis, recording and content management, control areas and systems. PSIA specifications are backward compatible, so even if they are enhanced, devices compatible with older versions will continue to work with those that conform to the new version of the specification. Custom interface and scripted connection security systems often need to be adjusted when the operating system or application software is upgraded, even if only in one system. The PSIA specification is the impact of these activities, so eliminating the traditional cost and maintaining custom interfaces and coding.


   Sum up:


    H.264 is the same as H.26x / MPEG-x AVC is a coding compression technology, its specific and efficient coding; SVAC "security watch digital audio and video codec technology standards" is the national standardized coding, Security prevention and control industry unique requirements of the technical standard protocol, but also a coding technology. GB / T28181 is a national standard for "information transmission, exchange and control of security monitoring video monitoring network system" ;; ONVIF and PSIA are international common interface protocols and standards. As for the H.265 and SVAC contention, can the two neutral, so that coding more secure, standardized and efficient? To achieve win-win?



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