In the video surveillance system, the size of the storage capacity needs and the level of the picture quality, and video lines have a great relationship. The following video storage space size and transmission bandwidth between the calculation method to do to introduce.
Bit rate is the number of bits transmitted per second. Bps (BitPerSecond), the higher the bit rate, the greater the data transfer. The bit rate represents the encoded (compressed) sound, how many bits of video data are represented per second, and the bit is the smallest unit in the binary, either 0 or 1. The relationship between bitrate and audio and video compression simply means that the higher the bitrate, the better the quality of audio and video, but the larger the encoded file; the less the bitrate is, the opposite is true.
DataRate refers to the data flow, also called the code rate, used by video files in unit time. It is the most important part of picture quality control in video coding. The same resolution, the greater the video stream code stream, the compression ratio is smaller, the higher the picture quality.
Uplink bandwidth is the local upload information to the network bandwidth. Uplink rate refers to the data transmission rate when the user computer sends information to the network. For example, if the file is uploaded to the Internet by FTP, the upload speed is the "uplink rate".
Downlink bandwidth is the bandwidth for downloading information from the network. Downlink rate refers to the user's computer to download information from the network when the data transfer rate, such as the file downloaded from the FTP server to the user's computer, the impact of the downlink speed is the "downlink rate."
Transmission bandwidth calculation:
Bit rate size × number of cameras = network bandwidth at least size;
Telecommunications 2Mbps ADSL broadband, in theory, the uplink bandwidth is 512Kbps = 64KB / s, the downlink bandwidth is 2Mbps = 256KB / s
Example: Monitoring the number of cameras in different places and in different places: n = 10 (20 channels) 1 monitoring center to remotely monitor and store video information for 30 days. The bandwidth of different video formats and the size of storage space are calculated as follows:
Local monitoring points:
D1 video format The bit rate of each camera is 1.5Mbps, that is, the data transmission bandwidth required by each camera is 1.5Mbps. The data transmission bandwidth required by 10 cameras is as follows:
1.5Mbps (video format bit rate) × 10 (number of cameras) = 15Mbps (upstream bandwidth)
That is, the network upstream bandwidth required by the local monitoring of the D1 video format is at least 15 Mbps;
720P (1 megapixel) video format The bit rate of each camera is 2Mbps, that is, the data transmission bandwidth required by each camera is 2 Mbps. The data transmission bandwidth required by 10 cameras is as follows:
2Mbps (video format bit rate) × 10 (number of cameras) = 20Mbps (upstream bandwidth)
Namely: 720P video format used by the local monitoring of the network uplink bandwidth of at least 20Mbps;
1080P (2MP) video format The bit rate of each camera is 4Mbps, that is, the required data transmission bandwidth of each camera is 4Mbps. The data transmission bandwidth of 10 cameras is as follows:
4Mbps (video format bit rate) × 10 (number of cameras) = 40Mbps (upstream bandwidth)
Namely: 1080P video format used by the local monitoring of the network uplink bandwidth of at least 40Mbps
Required bandwidth for D1 video format:
1.5Mbps (video format bit rate) × 50 (the total number of cameras at the monitoring point) = 75Mbps (downstream bandwidth)
That is, the network downlink bandwidth required by the D1 video format monitoring center is at least 75 Mbps
720P (one million pixels) video format required bandwidth:
2Mbps (bit rate in video format) × 50 (sum of total number of cameras in monitoring point) = 100Mbps (downstream bandwidth)
Namely: 720P video format monitoring center with the network downlink bandwidth of at least 100Mbps
Required Bandwidth for 1080P (2 Megapixel) Video Format:
4Mbps (bit rate of video format) × 50 (sum of total number of cameras of monitoring point) = 200Mbps (downlink bandwidth)
That is, the network downlink bandwidth required by the 1080P video format monitoring center is at least 200 Mbps
Storage space calculation:
Bit stream size (unit: kb / s; bit rate ÷ 8) × 3600 (unit: second; number of seconds in 1 hour) × 24 (unit: hour; day long) × 30 50 Total number of camera records to be saved at monitoring point) ÷ 0.9 (10% of disk format loss) = Size of required storage space (Note: 1TB = 1024GB; 1GB = 1024MB; 1MB = 1024KB)
50 way to store 30 days of D1 video format Video information storage space required size:
192 × 3600 × 24 × 30 × 50 ÷ 0.9 = 26367.2GB≈26TB
50 Road, storage of 30 days 720P (1 million pixels) Video format Video information storage space required size:
256 × 3600 × 24 × 30 × 50 ÷ 0.9 = 35156.3GB≈35TB
50 Road, storage 30 days of 1080P (2 million pixels) video format Video information storage space required size:
512 × 3600 × 24 × 30 × 50 ÷ 0.9 = 70312.5GB≈69TB
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