[Security] The calculation method of the hard disk capacity of monitoring video

Security monitoring video storage, a very important question is the hard disk can record how long the monitoring video? How much hard drive capacity is required to keep 30 days of monitoring? How much video can you record in one day? Before we explain these issues, let's take a look at the following information:

IPC Code Rate

The code rate of the camera is to monitor the bandwidth of the video stream, which is divided into the main stream and the code stream, and the primary stream is used for storing, and the code stream is generally used for previewing. At different resolution/frame rate and screen effect, the size of the code rate difference, by default, 1080P camera main code rate of 4m,720p for the main code rate of 2M.

Hard disk capacity

That is, the size of the hard disk storage space, generally have 500g/1t/2t/4t/6t,1t=1024g,1g=1024m, the general monitoring hardware storage capacity of more than 1T. It should be noted that the hard disk can actually be used to store video capacity of 90% of the total capacity, that is, the capacity factor is 0.9.

Monitoring channels

The number of surveillance cameras that need to be recorded, such as 6 cameras needed to save video, is 6.

Calculation method:

Single-day Video size = main stream (M) ÷8x3600 (sec) x24 (hour) x channel number ÷1024

Video days = hard disk Capacity (G) x1024x coefficient x8÷3600 (seconds) ÷24 (time) main stream (M) Number of channels

such as: 1 1080P camera, 4M main stream of the day video size: 4÷8X3600X24X1=43200M≈42GB

Note: The following provides a simple calculation formula, input IPC main stream, channel number (that is, monitor) and hard disk capacity, click Calculation can be.

Below, we follow the above calculation method, we listed the common network situation hard disk usage:

Camera paths	Code rate	1 Days ( - hours) Video capacity	2TB video Time (days)
1 Road	2M	21G	87
1 Road	4M	42G	43
4 Road	2M	84G	22
4 Road	4M	168G	11
8 Road	2M	168G	11
8 Road	4M	336G	5.4
16 Road	2M	336G	5.4
16 Road	4M	672G	2.7
N Road	2M	x N	N
N Road	4M	x N	N

2TB=2048GB, actual storage size ≈2048X0.9=1843GB

Description: in the actual engineering environment, there may be many types of camera combinations used, the calculation method is similar.

According to the above calculation, if there are 4 720P (main stream 2M) of the camera, monitoring video needs to be saved for 7 days, you need the hard disk storage capacity of at least 7X84GB=588GB, at this time recommended to purchase more than 1T capacity of the hard disk. Similarly, if there are 4-way 720P cameras, monitoring video needs to be kept for one months (30 days), you need hard disk capacity for 30X84GB=2520GB, it is recommended to buy more than 3TB hard disk.