Hello, guys!
Good day to you!
Today I want to talk with you about the NVR and DVR, and their differences.
What is NVR
The Network Video Recorder (NVR) receives, stores, and manages digital video streams transmitted by IP cameras over the network. The NVR allows you to watch, browse, play back, manage, and store multiple IP cameras at the same time. Freed from the constraints of computer hardware, no longer faced with the tedious installation of software. If all cameras are networked, a central management core must be required.
What is DVR
Compared with traditional analog video recorders, DVR uses hard disks to record video. Therefore, DVRs are also called hard disk recorders. It is a computer system for image calculation, storage, and processing. It has the functions of recording, recording, remote monitoring, and control of image/voice and dynamic frame for a long time. The DVR integrates five functions, such as the video recorder, image splitter, PTZ lens control, alarm control, and network transmission. A DVR can replace the functions of most devices in the analog surveillance system. In addition, the DVR has an advantage in price.
Differences Between NVR and DVR
The difference between DVR and NVR is one letter, but the difference between them is huge. The DVR digitally encodes, compresses, and stores analog videos on hard disks. The letter D indicates the encoding and storage technology, which is not closely related to network transmission. Therefore, the DVR is usually installed in the equipment room near the analog camera. The NVR obtains encoded and compressed video streams from the network and then stores and forwards them. The letter N indicates network transmission. Therefore, we generally don't see a direct connection to the video signal on the NVR device. The input and output are IP data that has been encoded and added with network protocols.
Independence
The first difference between the NVR and the DVR is that the NVR cannot work independently. The NVR needs to work with the IP camera or DVS to store and manage PU videos. The DVR can be directly connected to analog cameras for video acquisition, storage, and management. The DVR can work independently as a system.
Physical Location
In actual application, NVR deployment is flexible and not restricted by physical locations. That is, NVRs are not restricted by physical locations of cameras, encoders, and control centers, and only network connectivity is required. The NVR mainly considers the proper allocation and deployment of network video stream bandwidth. The DVR is directly connected to analog cameras. Therefore, the physical location of the DVR is restricted by the layout of onsite devices. Generally, the DVR needs to be located near cameras, audio devices, and auxiliary input/output devices. In addition, the transmission distance and signal transmission loss are considered.
HD
The NVR system is a truly digital, networked, and open system. When working with front-end HD cameras, HD storage and video forwarding can be implemented. Due to the limitations of the analog camera technology, channel transmission bandwidth, and chip processing, the DVR system cannot provide true HD video. The DVR system supports a maximum of D1 resolution.
Openness
The NVR adopts the open IP architecture and needs to work with the encoder, management platform, operating system, network transmission, and storage devices to implement complete functions. Therefore, the NVR has good integration capability and is more convenient and flexible. In addition, NVRs can run based on universal servers and operating systems, breaking the proprietary and closed pattern of devices in the security surveillance field. The DVR system has the functions of video capture, encoding and compression, storage and management, so it can work independently. Therefore, the compatibility between systems of different vendors is not considered, and the compatibility is poor. Generally, the video coding scheme, network transmission protocol, and video file system are all private, which is not conducive to integration.
Interface
The DVR provides various interfaces, including video input/output, audio input/output, PTZ control, alarm input/output, storage expansion, and network interfaces. NVRs are mainly used to store and forward videos. They are usually deployed in the second-level equipment room as middleware. This means that NVRs are far away from sites, interfaces, and workstations. Therefore, deploying redundant interfaces for it means an increase in costs.
Which NVR or DVR is better?
The DVR can add a hard drive to store data from an analog camera attached to the DVR. Note: The DVR is connected to an analog camera.
The NVR is more like a disk array and provides network storage space for IPCs or DVSs. That is, the NVR stores code streams that are encoded and transmitted over the network. The NVR is connected to a network camera.
When choosing NVRs and NVRs, you need to consider the following:
What hardware do you have in place currently? Are you prepared to replace it?
Are you familiar with network device programming?
How much maintenance is required? Budget for maintenance expenses
Who needs access? Is remote access required?
For those looking for a relatively simple security system, the DVR system may well suffice. If you need a top-of-the-line, very flexible solution, an NVR-based system may be the best choice.
Thanks for reading!
