Network Video Server (DVS) is a network monitoring and storage device that converts analog systems to digital systems. At present, some changes and application development trends of these product lines have been different from what we saw during the last year. For example, many new video formats (HD, SD, and storage) have been widely used in online video. In the server, you can find some information for product selection reference and judgment through the report of this test result.
Multi-channel compression technology is widely used. To some extent, if a DVR can provide 16-channel or even 32-channel video compression encoding, then it can be evenly distributed to multiplexed analog video for digitization; but for a single For the DVS, it can only provide 1 video. Therefore, from the perspective of cost and efficiency, it is easy to make the impression that the network video server is always higher in the impression of the user. However, because most of the current network video servers have adopted an open architecture, unified standards have been adopted in OS operating platforms, transmission communications, and video compression technologies. For example, Linux bases are used as the products of the participating vendors. Embedded operating system, and the use of a standard TCP / IP communication protocol, the video compression format are also commonly used MJPEG, MPEG-4 and H. The 264 format, in this way, can achieve 100% standardization of compatibility. On the other hand, due to the embedded open architecture and common protocol standards, these products have become “very standardized.†Under this premise, users can easily integrate after selecting different network video servers. Different back-end servers and storage devices also prove that network video servers have strong compatibility features. It is in this common condition that the demand for multi-channel applications also arises. With the increase of technical strength of multi-channel codec components development, Shanghai Sisi and other chip manufacturers have made video servers from the past single-channel or 4 Road, developed to 8, 12 or even 16 products. However, it is worth noting that although multi-channel video servers have been commercialized, under the constraints of network bandwidth matching, users still need to carefully plan their bandwidth to use freely under the conditions of a common network environment.
High-definition and HD video formats are carefully designed. In this test, we also found that the video resolution and resolution of the participating products can basically reach the standard definition D1 format, and some of them can support high-definition SXGA or 720P (HD) format output. In terms of practicality, SD D1 (720×480) is the most effective and reliable compression output format for video server DVS, because at the source, most analog cameras currently only provide 400 to 540 lines. Resolution range, so it is still controversial whether compressed or decompressed digital image formats need to be rendered in 720P or other high-definition formats. In this test, we used the video provided by a group of high-definition 650TVL gun cameras, the analog output video attached to a group of 1.3 million HD network cameras, and the video provided by a group of 500TVL analog cameras, and entered the same video server respectively. After reviewing the results, it was found that after the 650-line HD signal was connected to the video server, the IE browser naturally had its HD effect and the 16:9 HD output image format was available, but the 500-line analog camera input video signal could not be in HD. The image quality that is satisfactory on the presentation is inverse to the image distortion on the HDMI output format. It can be seen that we still have reservations about the demand for and benefits of the application of high-definition video presentation on network monitoring for network video servers.
Video Compression and Stream Control In this actual measurement, we also connected the camera signal, and tested the changes of the compressed stream under the same dynamic video and static video as the network camera. Through this test, we can see the difference. In the face of dynamic or static images, web server manufacturers have control over the traffic of video packets. From this, we can also analyze whether the video file size and the bandwidth requirement are due to insufficient bandwidth or the file size is too large, resulting in some video frames being dropped or delayed during transmission. At the same time, we can also observe whether different video resolutions will cause delays due to the difference in the number of frames and resolution under different network environment conditions, and cannot achieve real-time requirements. In this test, most of the manufacturers in this section not only adopted the frame rate and picture quality priority modulation options, but also demonstrated a good code flow control capability and delay reduction efficiency.
The expansion of local storage applications has faced the limitations of network bandwidth and the need for multiple channels. Most video server products have added local storage and playback capabilities. These features also allow network video servers to have local storage. Simultaneous recording and playback The Duplex system function, and even some products also have the same triple-play function of the same screen recording and playback. In addition, at present, local storage of network video servers mostly uses built-in hard disk HDDs, external RAID, and network nodes to store IP SANs or NAS to increase storage capacity and reduce network bandwidth load. These are all confirmed in this test. , And some products in the storage of the common interface format and hard disk planning part also has a guide mechanism to facilitate the user and the project owner to install the local storage function of the network video server, and through the network for remote operation and monitoring, in addition Can also perform recording and remote remote backup settings and so on.
Standardization of Alarms and Smart Configurations In this product test, this publication will inevitably bypass the connection of the network video server, alarm recording, motion detection and privacy masking before and after, and the functional performance of the integrated IVS intelligent analysis function. Although these are all functions already provided by the NVR, the addition of these functions on the network video server can also help reduce the load on the network data and accelerate the transmission speed, thus forming a standardized function of the network video server. It is worth mentioning that in the actual measurement, we also found that in addition to intelligent analysis functions such as counting and motion detection, face detection and multi-target and multi-area detection have also been applied to some products.
In addition, there are I/O counts, recording time schedules, search functions, and so on. For DVS, it should also be an item that has a low detection rate. In addition, we have not overlooked the DVS system's self-detection error correction, network configuration management, transmission environment, and compatibility and integration capabilities. It is also possible to detect whether the platform system is more effective in managing network video servers.
The structure and heat dissipation determine the device's suitability. Finally, we also do test and review on the appearance and structure of the network video server equipment. Some of the server products involved in the test are as large as a DVR, and some are as small as a gun camera. From the structural design point of view, we can see that the manufacturers' designs and protective measures for different environments are in place. , but in general this part of the machine's heat dissipation is still treated with fan or body metal heat dissipation. In terms of interface arrangements, these products are generally well-arranged for network interfaces and analog video interfaces. However, the arrangement and format of alarms and sounds are not the same. In terms of integration and integration, some interface formats will be created for the engineering contractors. The inconvenience.
Conclusion In summary, the network video server is actually a "black box"-based video digitization basic solution. It has various proprietary technologies from hardware to software, but we have seen from this test. The result is a consistent and standardized solution. This result will enable system integration vendors and software development vendors to implement more digital monitoring and integration capabilities, allowing users to freely select from a wide range of network video server devices. This is obviously also A benign model of multi-win-win situation.
Multi-channel compression technology is widely used. To some extent, if a DVR can provide 16-channel or even 32-channel video compression encoding, then it can be evenly distributed to multiplexed analog video for digitization; but for a single For the DVS, it can only provide 1 video. Therefore, from the perspective of cost and efficiency, it is easy to make the impression that the network video server is always higher in the impression of the user. However, because most of the current network video servers have adopted an open architecture, unified standards have been adopted in OS operating platforms, transmission communications, and video compression technologies. For example, Linux bases are used as the products of the participating vendors. Embedded operating system, and the use of a standard TCP / IP communication protocol, the video compression format are also commonly used MJPEG, MPEG-4 and H. The 264 format, in this way, can achieve 100% standardization of compatibility. On the other hand, due to the embedded open architecture and common protocol standards, these products have become “very standardized.†Under this premise, users can easily integrate after selecting different network video servers. Different back-end servers and storage devices also prove that network video servers have strong compatibility features. It is in this common condition that the demand for multi-channel applications also arises. With the increase of technical strength of multi-channel codec components development, Shanghai Sisi and other chip manufacturers have made video servers from the past single-channel or 4 Road, developed to 8, 12 or even 16 products. However, it is worth noting that although multi-channel video servers have been commercialized, under the constraints of network bandwidth matching, users still need to carefully plan their bandwidth to use freely under the conditions of a common network environment.
High-definition and HD video formats are carefully designed. In this test, we also found that the video resolution and resolution of the participating products can basically reach the standard definition D1 format, and some of them can support high-definition SXGA or 720P (HD) format output. In terms of practicality, SD D1 (720×480) is the most effective and reliable compression output format for video server DVS, because at the source, most analog cameras currently only provide 400 to 540 lines. Resolution range, so it is still controversial whether compressed or decompressed digital image formats need to be rendered in 720P or other high-definition formats. In this test, we used the video provided by a group of high-definition 650TVL gun cameras, the analog output video attached to a group of 1.3 million HD network cameras, and the video provided by a group of 500TVL analog cameras, and entered the same video server respectively. After reviewing the results, it was found that after the 650-line HD signal was connected to the video server, the IE browser naturally had its HD effect and the 16:9 HD output image format was available, but the 500-line analog camera input video signal could not be in HD. The image quality that is satisfactory on the presentation is inverse to the image distortion on the HDMI output format. It can be seen that we still have reservations about the demand for and benefits of the application of high-definition video presentation on network monitoring for network video servers.
Video Compression and Stream Control In this actual measurement, we also connected the camera signal, and tested the changes of the compressed stream under the same dynamic video and static video as the network camera. Through this test, we can see the difference. In the face of dynamic or static images, web server manufacturers have control over the traffic of video packets. From this, we can also analyze whether the video file size and the bandwidth requirement are due to insufficient bandwidth or the file size is too large, resulting in some video frames being dropped or delayed during transmission. At the same time, we can also observe whether different video resolutions will cause delays due to the difference in the number of frames and resolution under different network environment conditions, and cannot achieve real-time requirements. In this test, most of the manufacturers in this section not only adopted the frame rate and picture quality priority modulation options, but also demonstrated a good code flow control capability and delay reduction efficiency.
The expansion of local storage applications has faced the limitations of network bandwidth and the need for multiple channels. Most video server products have added local storage and playback capabilities. These features also allow network video servers to have local storage. Simultaneous recording and playback The Duplex system function, and even some products also have the same triple-play function of the same screen recording and playback. In addition, at present, local storage of network video servers mostly uses built-in hard disk HDDs, external RAID, and network nodes to store IP SANs or NAS to increase storage capacity and reduce network bandwidth load. These are all confirmed in this test. , And some products in the storage of the common interface format and hard disk planning part also has a guide mechanism to facilitate the user and the project owner to install the local storage function of the network video server, and through the network for remote operation and monitoring, in addition Can also perform recording and remote remote backup settings and so on.
Standardization of Alarms and Smart Configurations In this product test, this publication will inevitably bypass the connection of the network video server, alarm recording, motion detection and privacy masking before and after, and the functional performance of the integrated IVS intelligent analysis function. Although these are all functions already provided by the NVR, the addition of these functions on the network video server can also help reduce the load on the network data and accelerate the transmission speed, thus forming a standardized function of the network video server. It is worth mentioning that in the actual measurement, we also found that in addition to intelligent analysis functions such as counting and motion detection, face detection and multi-target and multi-area detection have also been applied to some products.
In addition, there are I/O counts, recording time schedules, search functions, and so on. For DVS, it should also be an item that has a low detection rate. In addition, we have not overlooked the DVS system's self-detection error correction, network configuration management, transmission environment, and compatibility and integration capabilities. It is also possible to detect whether the platform system is more effective in managing network video servers.
The structure and heat dissipation determine the device's suitability. Finally, we also do test and review on the appearance and structure of the network video server equipment. Some of the server products involved in the test are as large as a DVR, and some are as small as a gun camera. From the structural design point of view, we can see that the manufacturers' designs and protective measures for different environments are in place. , but in general this part of the machine's heat dissipation is still treated with fan or body metal heat dissipation. In terms of interface arrangements, these products are generally well-arranged for network interfaces and analog video interfaces. However, the arrangement and format of alarms and sounds are not the same. In terms of integration and integration, some interface formats will be created for the engineering contractors. The inconvenience.
Conclusion In summary, the network video server is actually a "black box"-based video digitization basic solution. It has various proprietary technologies from hardware to software, but we have seen from this test. The result is a consistent and standardized solution. This result will enable system integration vendors and software development vendors to implement more digital monitoring and integration capabilities, allowing users to freely select from a wide range of network video server devices. This is obviously also A benign model of multi-win-win situation.
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