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Shenzhen Changehome Microelectronics Co.,Ltd

NVR & DVR

NVR is a video camera connected to IP camera. IP camera is divided into CIF/D1 ordinary IPC and digital million HD IPC. The video recording effect of DVR depends on the compression algorithm and chip processing capability of the camera and DVR itself, while the NVR video recording effect is It mainly depends on IPcamera, because IPcamera outputs digital compressed video. When the video arrives at NVR, it does not need analog-to-digital conversion and no compression. It only stores, and it needs to be decompressed when it is to be displayed and played back.


First, the DVR description

The DVR is the Digital Video Recorder (also called the Personal Video Recorder or PVR) - a digital video recorder or a digital hard disk recorder. We are used to calling it a hard disk recorder. Compared to traditional analog video recorders, which use hard disk recording, they are often referred to as hard disk recorders, also known as DVRs. It is a computer system for image storage processing, with long-term recording, recording, remote monitoring and control of images/voices.

The DVR combines five functions of video recorder, picture splitter, pan/tilt lens control, alarm control, and network transmission. It can replace the functions of a large number of devices in the analog monitoring system with one device, and gradually occupy the price. Advantage.

DVR uses digital recording technology, which is far superior to analog monitoring equipment in image processing, image storage, retrieval, backup, network transmission, remote control, etc. DVR represents the development direction of TV monitoring system, which is currently on the market. The preferred product for TV surveillance systems. Generally divided into: DVR, PC DVR, embedded DVR and so on.

DVR can not support IP cameras. From the general definition, products called DVRs generally do not support IP network cameras. Digital DVRs generally refer to the conversion of video data captured by analog cameras into digital recordings, and do not include IP network transmission. . By definition, DVR intelligence supports the input of analog signals. Therefore, if the DVR supports IP cameras, it is necessary to decode the IP camera into an analog signal number in the previous stage before inputting the DVR.


Second, the NVR description

The NVR is an abbreviation for (Network Video Recorder). The most important function of the NVR is to receive the digital video code stream transmitted by the IPC (Network Camera) device through the network, and store and manage it, thereby realizing the distributed architecture advantage brought by the network. Simply put, with Nvr, you can simultaneously view, browse, play back, manage, and store multiple webcams. Get rid of the computer hardware, no longer need to face the tedious installation software. If all cameras are networked, then the only way to do this is to have a centralized management core.

In recent years, with the rapid development of IP networks, the video surveillance industry has also entered a fully networked era. The video surveillance industry in the era of network-wide is gradually showing the characteristics of the IT industry. As the core product of networked monitoring, NVR (Network VideoRecorder) has essentially become an IT product. The main function of the NVR is to receive digital video streams transmitted by IPC (network camera), DVS (video encoder) and other devices through the network, and store and manage them.

To put it simply: NVR (NETWORK VIDEO RECORDER), also known as network video recorder, is a type of video recording device that is used in conjunction with a network camera or video encoder to record digital video transmitted over a network.

Its core value lies in video middleware, which is widely compatible with the encoding formats of different digital devices of various manufacturers through video middleware, thereby realizing the advantages of distributed architecture and component access brought by network.

The NVR can support analog cameras through an encoder. The function of the encoding device is to convert the analog signal of the analog camera into an IP video stream for computer network transmission. Almost all NVRs support encoding. The benefits of encoding are:

1 Make existing analog cameras work with NVRs

2 Avoid the use of dedicated coaxial cable, twisted pair or fiber network

3 Some systems are both DVR and NVR. In some system applications, IP cameras can be directly connected to analog cameras without the need for encoding. This type of device is called a hybrid DVR/NVR device. The benefit of a hybrid system is that it is less expensive than a pure software NVR and simplifies the transition of analog cameras like IP cameras.

All NVRs support the following basic features:

1 Record video

2 live video viewing

3 video search

4 Appeal operations from a remote location Different NVRs have different advanced features. Although all NVRs are application software, the software functions provided by these NVRs can vary greatly, from one vendor to another. There will be some differences between different products.

Third, the specific difference between NVR and DVR

In terms of surface structure, the difference between NVR and DVR is that there is a separate universal port for video input and output and network connection. Essentially, one of the most fundamental factors in distinguishing between DVR and NVR is whether the “digital” DVR compresses and converts the analog video signal and stores it in its hard disk.


"Digitalization" of a DVR means that the compression and storage techniques are for digital signals, rather than directly transmitting digitally encoded video images. Therefore the DVR must be deployed near the analog camera. Instead, the NVR can store digital images directly from the IP network. Therefore, the biggest difference between the NVR and the DVR is that the DVR encodes and decodes the analog video captured by the analog camera and stores it in the hard disk, while the NVR directly records the digital video that the camera has encoded. Therefore, the NVR has no video interface, and its input and output data are both IP data and compression-encoded video.


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