From a technical point of view, the DVR has been developed for a long time and has functions such as recording/recording, remote monitoring, and cloud mirror control of the image/voice, and functions such as screen division, alarm control linkage, and network transmission. At present, DVR technology is basically mature and its functions are basically perfect. What will be the future development direction of DVR technology?
1, hardware can be summarized as faster processing, longer storage time
With the development of chip technology, higher-performance CPUs make DVRs faster and more powerful. From the early CIF DVR, to the current D1 DVR, 960H DVR, Hybrid DVR, HD-SDI DVR. In addition, with the trend of high-definition, the demand for storage is also increasing, and DVR hard disk management technology is also improving. Basically, the DVR may support more hard disk interfaces, support RAID technology, and support the compatibility of storage technologies such as DAS, SAN, and NAS.
2, the encoding method is more advanced
The compression technologies used in mainstream DVRs currently on the market include MPEG-4, H.264, M-JPEG, MPEG-4, and H. 264 is the most common compression method in China, and H. 264 has become the mainstream because it is more in line with the requirements of network transmission. In the future, in order to make embedded DVRs more widely applicable, the unification of various algorithms will be the trend of future development. However, such unification is not based on the standards of any domestic company, but requires a wide range of government functional departments and DVR industry chains. On the wide participation of various types of companies. For example, China has an AVS compression algorithm with independent intellectual property rights, and H. 265 compression algorithm, relative to H. 264 has revolutionized many aspects.
AVS (AudioVideocoding Standard, audio and video coding standard) is the abbreviation of the "Information Technology Advanced Audio and Video Coding Standard" series of standards, is China's second-generation source coding standard with independent intellectual property rights, and is a common basic standard for the digital audio and video industry. AVS solves the deadlock of patent licensing issues of AVC through a simple one-stop licensing policy. It is an open-ended national and international standard and easy to promote. In addition, AVC is only a video coding standard, and AVS is a complete standard system including system, video, audio, and media copyright management, providing a more comprehensive solution for the digital audio and video industry. With the support of national policies, it has the potential to become a unified standard in the video surveillance industry.
The H.265 standard was developed based on the H.264 standard and combined with H. The prevalence of 264 in video applications is foreseeable. 265 agreement in the future broad prospects for development. Some of the world’s major television organizations and media operators have already chosen H. 264 As the media format standard, some major codec equipment manufacturers have also been actively involved in the study of the H.265 standard.
3, more convenient interconnection and interoperability
Compared with the IPV's proposed ONVIF protocol, DVRs have been slow to upgrade their software versions, and they have shown insufficient openness for integration and unification. In terms of the interconnection between products, the openness between systems, each company does not have a unified standard for products. The access to the current system is mainly through the SDK. Each vendor is independent and can only solve the interconnection and interconnection at a certain level. It is a long-term process to truly realize interconnection and interconnection.
The line transmission function is getting more and more attention, and become a standard function together with GPS. The 3G network covers a wide area, which is the most important point of on-board monitoring and networking. However, the characteristics of the 3G network determine that this network cannot be as stable and reliable as the wired network. With the introduction of high-definition, this problem becomes even more prominent. Providing a stable and clear back-end browsing image in an unstable network is a problem that needs to be considered in front of various manufacturers.
July 28, 2021
