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The monitoring system based on SDI-DVR as a management device has outstanding advantages. First of all, compatibility with other devices currently on the platform is good. SDI cameras can only directly access SDI-DVRs through coaxial cables. Video data is not like NVRs. After compression and multiple conversions, the picture quality is better compared to the traditional DVR.
H.264 shows off its talent again
As we all know, the digital signal output by the SDI camera is very large. If it is not encoded, the back-end storage is almost impossible. From the A&S "Safety Automation" test SDI DVR found that manufacturers have adopted a more extensive and advanced H.264 compression format, H.264 can maintain a high compression ratio, but also have a high quality and smooth Video images are also the main compression algorithms used in the surveillance field. From the test situation, the video stream has been effectively controlled. Under the 1080P@30fps standard, the stream detected by the SDI-DVR monitor is generally 4-6mbps. This encoding compression process also makes SDI. The high storage requirements of the video stream data of the camera are no longer a problem in its promotion and application. After solving the problem of data storage, how about the loss of SDI video signal after decompression? This is also the key performance of SDI-DVR. From the test results, we can see that different manufacturers have different brands. The SDI-DVR's picture quality loss is also very different. Select the same HD-SDI camera as the video signal input source. Compared with the test, in terms of definition, some SDI-DVRs can still reach 1000 lines after decompression. There are also some obvious sharpness attenuation, in the reduction of color, the same situation, the use of different DVR hardware, as well as the internal design process and other details, all make different SDI-DVR performance difference. However, it is certain that most of the SDI-DVR compression and decoding results are better than the output of an IP camera with 1080P@30fps set by the same parameters. In addition, in terms of delay performance, although HD - After the decompression and conversion of SDI, the data transmission has a certain delay, but after testing, the delay time is generally much smaller than the delay time of the IP camera itself, which is exactly the greatest advantage reflected by the SDI monitoring system.
Streaming media technology to coordinate bandwidth
In the design of the video playback function, this test can also see that many manufacturers attach importance to transmission bandwidth control. After the SDI-DVR compresses the SDI digital signal, when the user performs a monitoring operation through a remote IE login client, it also causes network bandwidth problems. Streaming media technology is designed to alleviate this problem. Streaming media technology can also be referred to as streaming media technology. The principle of this technology is to store the video and audio information in a compressed server and store it on the server. The user can download while watching, instead of waiting for the entire compressed file to be downloaded to his computer. Can watch the network transmission technology. In general, in networked monitoring systems, it is often necessary to adopt streaming media technologies to implement distributed network monitoring applications and to avoid network bottlenecks caused by concurrent traffic. However, you can see in the actual test, click to view the playback video, while detecting the size of its stream, under the influence of streaming media technology, the video file is automatically downloaded to the local while playing, resulting in the playback stream compared to the time of entry The code stream is much larger. If several channels of video are also being monitored in real time, the bandwidth will still have a certain impact. Manufacturers should provide setting options, such as setting different download speeds according to the bandwidth environment of different users, so as to ensure that the bandwidth occupied during playback can be viewed without affecting surveillance video or real-time monitoring of other channels.
Stability is still the main appeal
This time SDI-DVR uses Linux as the operating system. In fact, Linux has always been the mainstream operating system used by DVRs. SDI-DVR is also applied in this system architecture. The stability advantages of embedded SDI-DVRs come from not only The low failure rate of the hardware depends largely on the high stability of the operating system and application software used in the embedded DVR. The software platform chosen plays a crucial role. In this test, SDI-DVRs can generally access 2-8 hard disks or more, and have e-SATA interfaces to expand capacity at any time. In terms of exterior structure design, in addition to being beautiful and sturdy, there is a requirement that heat dissipation must be good. The more SDI-DVR video compression cards, the greater power consumption, heat dissipation, plus the hard heat source, excessive heat accumulated in the chassis, will cause system instability. The products tested this time, the inside of the chassis will usually be designed with 1-3 small fans, to strengthen the heat dissipation inside the chassis and increase the air convection.
In terms of video output resolution, the biggest advantage of SDI-DVR can be said to support HDMI high-definition output. Because the security industry as a whole is moving toward high-definition, SDI-DVR's high-definition output can compete with NVR even higher. In terms of latency, SDI-DVR must also be superior. The SDI-DVRs tested all have at least one HDMI output interface, and most of the manufacturers' products can output TV, VGA format video synchronously, and there are also DVRs with mixed analog-digital design. The video output format selection is more flexible and diverse. .
future development
It can be foreseen that due to the advantages of HD-SDI camera images and real-time video data transmission, the next few years will inevitably become a product sought after by manufacturers and engineering firms, and the equipment they support will also receive attention. The importance of end-to-end management storage SDI-DVR is self-evident, I think the future SDI-DVR can go further in the following aspects.
1, screen clarity
Sharpness has always been a key indicator for customers' choice of products, and image quality is a core issue in evaluating digital video recorder product quality. With the development of high-definition technology and the popularity of high-definition cameras, high-definition DVR will be the target for the development of the next generation of DVR manufacturers.
2, a more efficient compression algorithm
In order to meet the needs of high-definition storage, improve image storage time, and reduce the bandwidth used during transmission, vendors are developing more efficient compression algorithms. Currently, the commonly used compression algorithm is simplified H.264.
3, centralized storage <br> <br> With advances in digital technology, the amount of data to store more and more, to meet the high storage requirement is an important issue DVR manufacturers need to face. The video surveillance system is from data acquisition, transmission, storage to digital data collection, transmission, storage, from the original space to the current remote monitoring, remote storage, remote recovery technology applications, with the improvement of the system, is also experiencing A step-by-step evolution and refinement will integrate technologies such as NAS, SAN and ISCSI in the future, and the data will be stored directly on the network. This is an inevitable trend in the development of storage technology.
4, the operation interface
Improving the software operating interface and increasing the added value of software profits is a direction that every DVR manufacturer expects to change. From the appearance, interface, operating habits and other details start, change China's image of manufacturing, make the interface closer to the user's use. The application of the graphical interface and the clarity of the colors will bring new sensations to people, and they will be the basic indicators for customers to choose their products.
5, smart technology
Intelligent technology enables the video surveillance system to allow the identification and processing that originally required the on-duty personnel to intervene to be completed by the computer, thereby greatly reducing the workload of the on-duty personnel and improving the security quality. With the advancement of projects such as "Safe City", massive video information makes SDI-DVR solve the storage problem on the one hand, and on the other hand it must provide strong support for remote or local search.
How HD-SDI Hard Disk Recorder Helps Media HD Monitoring
With the further development of high-definition, not only has the front-end video capture equipment changed, but the high-definition video data traffic has soared. This has also placed higher demands on the back-end storage management equipment. Some people say that the development of high-definition will inevitably prompt NVR to replace DVR. However, the emergence of HD-SDI cameras has brought new opportunities and challenges in the field of video storage devices. HD-SDI hard disk recorders are stored in such high-definition storage. Demand came into being.