Analysis on the development of hybrid DVR in the era of digital surveillance

The main product forms in the digital surveillance era are analog cameras, DVRs and DVSs, while the main product forms in the era of network video surveillance correspond to network cameras and NVRs. In the era of network video surveillance, more attention is paid to "high definition" and "intelligence", which also represents the development of video surveillance. However, it is inevitable to see that DVR is still the most popular product form. The analog camera is still the mainstream image acquisition device. The network camera is mainly used to meet the requirements of high definition. In the current form, how to be compatible with the old analog acquisition system and access to the new network acquisition system, DVR and NVR alone have been difficult to solve, mixed DVR has emerged.

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By mixing the definition of H-DVR, it is easy to see that the hybrid DVR is a cross-border product, which has played a good role in the transition from the era of digital video surveillance to the era of network video surveillance; It can access analog signals and access new high-definition network video. It can transform high-definition at a small cost, and protect users' investment. It also promotes the process of “HD-based” video surveillance system. Its emergence fills the gap between digital video surveillance technology and the transition from analog-to-digital to full-IP monitoring.

Since the concept of H-DVR was proposed and promoted in 2009, hybrid DVR has played an irreplaceable role in the development of video surveillance and the promotion of high definition. Especially in the financial, public security and other industries, due to its cross-border and flexible features, it has been greatly promoted, users have been familiar with hybrid DVR, hybrid DVR has become an important part of the current video surveillance system. However, since the application of network cameras has not yet been "civilized", DVR is still the main product of the civilian security market. H-DVR seems to be mainly used in higher-end industrial applications to realize the upgrade and upgrade of high-definition surveillance. Analog system compatibility.

Hybrid DVR selection considerations

Hybrid DVR takes into account the functions of traditional DVRs and NVRs. The core technologies and functional requirements are often taken into consideration. The actual selection should also be considered.

Network camera access and forwarding capabilities

The first thing to pay attention to is the access capability of the network camera, that is, how many 1080p HD accesses can be satisfied at the same time and how many 1080p HD remote previews can be satisfied. This point is easier to understand. But also need to pay attention to the network throughput of the hybrid DVR.

High-definition network video occupies more network bandwidth. One-way 1080p video often requires 6-8Mbps network bandwidth, and one-way 720p video often requires 3-4Mbps network bandwidth. Taking a 16-channel hybrid DVR as an example, 16-channel 720p, 8-channel 1080p network video access, accessing the network camera requires 64M access bandwidth, and forwarding 1 channel respectively requires at least 64M access bandwidth. With 16 analog channels added, the network output also needs 32M, which requires 160M bandwidth throughput. In practical applications, the output of the hybrid DVR network often has more than one channel per channel, and higher requirements are imposed on bandwidth throughput. That is, in the choice of hybrid DVR, not only the access capability of the network camera but also the network throughput capability of the hybrid DVR needs to be confirmed.

HD application capability

In consumer video applications, the need for video clarity has always been an eternal topic. In the security video surveillance, the demand for "HD" has also been mentioned more and more. Full compatibility with HD also puts higher demands on video surveillance products. That is to say, not only the network video capture is required to be high-definition, but also the storage, preview display and playback need to be high-definition.

At present, the mainstream hybrid DVR often has an HDMI high-definition output interface to have high-definition display capability. At this time, it is also necessary to consider the video processing capability of the hybrid DVR, that is, how many high-definition video decoding images of the high-definition video are supported at the same time, and how many HD video images are supported. Synchronous playback is also a key parameter for measuring the performance of a hybrid DVR.

Network front end compatibility

At the same time, in practical applications, especially for staging projects or retrofit projects, it is often necessary to access network cameras of multiple brands. Therefore, the compatibility problem of hybrid DVRs for multi-brand network cameras is also an essential factor for equipment selection.

At the same time, since the access of the network camera is relatively complicated compared to the analog camera, the ease of access of the network camera can support the automatic search addition and simple configuration of the network camera, and is also considered in practical applications.

Network front-end management capabilities

On the one hand, with the development of security products such as high-definition network cameras, network cameras, hybrid DVRs, and NVRs have been greatly developed. On the other hand, we also recognize that the access and management of network cameras lacks uniform standards in the industry. This phenomenon is more obvious in NVR products. Due to different market positioning and technology accumulation of manufacturers, NVR products have various forms and application differentiation. Most of the customers have relatively limited knowledge of the network video surveillance system and lack of experience. Such product differences not only do not provide users with diverse choices, but also bring confusion to product functions and forms and user choices. Mixed DVRs are also affected more or less, bringing confusion and incomprehensibility of user choices. From the perspective of monitoring actual applications, network access not only requires network video access, but also better video management.

The management of the general network camera should include the following functions: support encoding parameters (resolution, bit rate, frame rate, etc.) of the encoding device such as the network camera through the network, and video input signal parameters (brightness, contrast, chroma, saturation, etc.) Supports configuration of front-end network device motion detection (motion detection area, sensitivity), alarm signal (arming time, signal type), video occlusion (occlusion area, sensitivity); support for front-end network equipment various types of alarm information receiving and linkage Operation; support PTZ control for network cameras and network domes.

That is, we must also realize that the hybrid DVR should not only be satisfied with the access and storage of the network camera, but also the management of the network video. This point is also easy to ignore when the product is selected. Otherwise, compared with the mature analog system, the network video application will be “big discounted” and it is difficult to really impress the user.

Of course, the choice of hybrid DVR is multi-faceted, including the security and reliability of the overall application. As for the analog coding part, because the system is very mature, there is not much elaboration here, only the relevant notes for the network application. .

Hybrid DVR development

Compared with the traditional DVR, the hybrid DVR is more of a core device for network video monitoring and management. Its main attributes are “HD” and “networking”. In the process of “networking” of video surveillance, in the video The application of the monitoring market has gradually increased, and it has been widely radiated to the government public security, finance, education, transportation and other fields. It has developed rapidly in the past two years.

However, we still need to realize that since domestic network video surveillance is still in a development stage and there is still a lack of uniform standard specifications, the real application needs of customers have yet to be further explored. Hybrid DVR, as the main force connecting digital video surveillance and network video surveillance, will continue to coexist with DVR and NVR equipment for a long period of time, contributing to the development and application of video surveillance.

From the current development point of view, if the hybrid DVR is further developed, it must also face and solve the following problems.

Network device access compatibility

At present, it is also a problem that must be solved in the promotion of network video surveillance.

First of all, due to the different network communication protocols of various manufacturers, most manufacturers' hybrid DVR systems can only be compatible with their own branded network cameras, or compatible brands are limited, which will undoubtedly hinder the development of the market, especially in phased construction, or system transformation projects. The embodiment will be more obvious. In addition, in terms of video and audio coding and decoding, there are also obstacles to different coding methods. Although the mainstream coding algorithms at home and abroad are H.264 and MPEG-4, but the same coding method, the code stream encapsulation may be different, the coding level may be different, and it is still necessary for the manufacturer to spend a lot of work to realize unified access and compatibility of network devices. Although the standard protocol organization ONVIF and PSIA are committed to solving the standard problem of communication protocols, the definition of the protocol is relatively incomplete and can only satisfy the access of basic functions, and the stamina is still insufficient. At the same time, because each manufacturer's understanding of the standard protocol is also different, how to better achieve the compatibility of network coding equipment, but also put forward higher requirements for hybrid DVR manufacturers.

Network security

Second, in the consideration of network security. Network video surveillance systems, often using network cameras, network domes, then inevitably will encounter the problem of leakage of private network addresses, while the security of video stream is also questioned by people. How to circumvent, how to ensure the security of the network code stream, also need to consider the improvement of hybrid DVR manufacturers.

Compliance with actual application requirements

With the application and development of hybrid DVR, it is difficult to meet the needs of users by simply solving the problem of "high definition", and it is often necessary to be appropriate with the actual application of the customer.

For example, in the financial industry, some unmodified outlets, the upstream bandwidth is still 2M, how to transfer HD video to the center? Or high-definition video stream is large, long-term storage is often difficult to meet. Is there a better solution without adding storage media?

Reflected in the public security industry, social network network video, access to the public security network often need to increase the gatekeeper, hybrid DVR can provide a safe and reliable access plan?

In this way, manufacturers who need to mix DVRs often dig deep into customer needs and give solutions that truly fit the needs of users, in order to better promote the promotion of hybrid DVRs and promote the development of video surveillance.

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