Video monitoring storage space size and transmission bandwidth calculation method
2025-05-28 22:02:30
In the video surveillance system, the demand for the size of the storage space is related to the quality of the picture and the video line. The following describes the calculation method between the video storage space size and the transmission bandwidth.
Bit rate refers to the number of bits transmitted per second. The unit is bps (Bit Per Second). The higher the bit rate, the larger the data transmitted. The bit rate indicates how many bits per second need to be used for the encoded (compressed) audio and video data, and the bit is the smallest unit in the binary, either 0 or 1. The relationship between bit rate and audio and video compression is simply that the higher the bit rate, the better the audio and video quality, but the larger the encoded file; if the bit rate is lower, the situation is just the opposite.
DataRate (DataRate) refers to the data traffic used by a video file per unit of time. It is also called the code rate and is the most important part of picture quality control in video coding. At the same resolution, the larger the code stream of the video file, the smaller the compression ratio and the higher the picture quality.
The upstream bandwidth is the bandwidth of the local upload information to the network. The uplink rate refers to the data transmission rate when the user computer sends information to the network. For example, when uploading files to the Internet using FTP, the upload rate is the “upstream rateâ€.
Downstream bandwidth is the bandwidth for downloading information from the network. The downlink rate refers to the data transmission rate when the user computer downloads information from the network. For example, if the file is downloaded from the FTP server to the user's computer, the downlink rate is affected.
First, transmission bandwidth calculation: bit rate size × number of cameras = network bandwidth at least size;
Note: The bandwidth of the monitoring point is the minimum bandwidth required for the uplink (the monitoring point uploads the video information to the monitoring center); the bandwidth of the monitoring center is the minimum bandwidth required for the downlink (the video information of the monitoring point is downloaded to the monitoring center); : Telecom ADSL broadband 2Mbps, in theory, its uplink bandwidth is 512kbps = 64kb / s, its downlink bandwidth is 2Mbps = 256kb / s
Example: Monitor the number of cameras distributed in 5 different places, each place: n = 10 (20) 1 monitoring center, remote monitoring and storage of video information, storage time is 30 days. The bandwidth and storage space of different video formats are calculated as follows:
2. Local monitoring points: The bit rate of each camera in the CIF video format is 512 Kbps, which means that the data transmission bandwidth required by each camera is 512 Kbps. The data transmission bandwidth required by the 10 cameras is:
512 Kbps (bit rate of video format) × 10 (number of cameras) ≈ 5120 Kbps = 5 Mbps (uplink bandwidth): That is, the network upstream bandwidth required for each local monitoring using the CIF video format is at least 5 Mbps;
1. The bit rate of each camera in the D1 video format is 1.5Mbps, that is, the data transmission bandwidth required by each camera is 1.5Mbps, and the data transmission bandwidth required by the 10 cameras is: 1.5Mbps (bit rate of the video format) × 10 (the number of cameras) = ​​15 Mbps (upstream bandwidth): namely, the network upstream bandwidth required for each local monitoring using the D1 video format is at least 15 Mbps;
2,720P (1 million pixel) video format The bit rate of each camera is 2Mbps, that is, the data transmission bandwidth required by each camera is 2Mbps, and the data transmission bandwidth required by the 10 cameras is:
2 Mbps (bit rate of video format) × 10 (number of cameras) = ​​20 Mbps (upstream bandwidth) Namely: 720P video format The network upstream bandwidth required for monitoring at each site is at least 20 Mbps; 1080P (2 million pixels) video The bit rate of each camera in the format is 4Mbps, that is, the data transmission bandwidth required by each camera is 4Mbps, and the data transmission bandwidth required by the 10 cameras is:
4 Mbps (bit rate of video format) × 10 (number of cameras) = ​​40 Mbps (upstream bandwidth) That is, the network uplink bandwidth required for monitoring of each place using 1080P video format is at least 40 Mbps.
3, the required bandwidth of CIF video format:
512 Kbps (bit rate of video format) × 50 (sum of the total number of cameras at the monitoring point) = 25600 Kbps = 25 Mbps (downlink bandwidth), that is, the network downlink bandwidth required for monitoring the center using the CIF video format is at least 25 Mbps;
4. Required bandwidth of D1 video format:
1.5Mbps (bit rate of video format) × 50 (sum of the total number of cameras at the monitoring point) = 75Mbps (downlink bandwidth), that is, the network downlink bandwidth required by the monitoring center using the D1 video format is at least 75 Mbps;
The required bandwidth of the 5,720P (1 million pixel) video format:
2 Mbps (bit rate of video format) × 50 (sum of the total number of cameras at the monitoring point) = 100 Mbps (downlink bandwidth), that is, the network downlink bandwidth required by the 720P video format monitoring center is at least 100 Mbps;
6. Required bandwidth of 1080P (2 million pixels) video format:
4Mbps (bit rate of video format) × 50 (sum of the total number of cameras at the monitoring point) = 200Mbps (downlink bandwidth), that is, the network downlink bandwidth required by the monitoring center using the 1080P video format is at least 200 Mbps;
7. Storage space calculation: stream size (unit: kb/s; ie: bit rate ÷8)×3600 (unit: seconds; number of seconds for one hour)×24 (unit: hours; long time of day)×30 (days saved) x 50 (the total number of camera videos to be stored at the monitoring point) ÷ 0.9 (loss of 10% of disk formatted) = size of required storage space (Note: 1TB = 1024GB for storage unit conversion; 1GB = 1024MB; 1MB=1024KB)
The required storage size for the 50-way storage of 30-day CIF video format video information is: 64×3600×24×30×50÷0.9=8789.1GB≈9TB
The required storage space for 50-channel D1 video format video information stored for 30 days is: 192×3600×24×30×50÷0.9=26367.2GB≈26TB
The required storage space for the 50-channel 720P (1 million pixel) video format recording information stored for 30 days is: 256×3600×24×30×50÷0.9=35156.3GB≈35TB
The required storage space for 50-channel storage of 1080P (2-megapixel) video format video information for 30 days is: 512×3600×24×30×50÷0.9=70312.5GB≈69TB
Bit rate refers to the number of bits transmitted per second. The unit is bps (Bit Per Second). The higher the bit rate, the larger the data transmitted. The bit rate indicates how many bits per second need to be used for the encoded (compressed) audio and video data, and the bit is the smallest unit in the binary, either 0 or 1. The relationship between bit rate and audio and video compression is simply that the higher the bit rate, the better the audio and video quality, but the larger the encoded file; if the bit rate is lower, the situation is just the opposite.
DataRate (DataRate) refers to the data traffic used by a video file per unit of time. It is also called the code rate and is the most important part of picture quality control in video coding. At the same resolution, the larger the code stream of the video file, the smaller the compression ratio and the higher the picture quality.
The upstream bandwidth is the bandwidth of the local upload information to the network. The uplink rate refers to the data transmission rate when the user computer sends information to the network. For example, when uploading files to the Internet using FTP, the upload rate is the “upstream rateâ€.
Downstream bandwidth is the bandwidth for downloading information from the network. The downlink rate refers to the data transmission rate when the user computer downloads information from the network. For example, if the file is downloaded from the FTP server to the user's computer, the downlink rate is affected.
First, transmission bandwidth calculation: bit rate size × number of cameras = network bandwidth at least size;
Note: The bandwidth of the monitoring point is the minimum bandwidth required for the uplink (the monitoring point uploads the video information to the monitoring center); the bandwidth of the monitoring center is the minimum bandwidth required for the downlink (the video information of the monitoring point is downloaded to the monitoring center); : Telecom ADSL broadband 2Mbps, in theory, its uplink bandwidth is 512kbps = 64kb / s, its downlink bandwidth is 2Mbps = 256kb / s
Example: Monitor the number of cameras distributed in 5 different places, each place: n = 10 (20) 1 monitoring center, remote monitoring and storage of video information, storage time is 30 days. The bandwidth and storage space of different video formats are calculated as follows:
2. Local monitoring points: The bit rate of each camera in the CIF video format is 512 Kbps, which means that the data transmission bandwidth required by each camera is 512 Kbps. The data transmission bandwidth required by the 10 cameras is:
512 Kbps (bit rate of video format) × 10 (number of cameras) ≈ 5120 Kbps = 5 Mbps (uplink bandwidth): That is, the network upstream bandwidth required for each local monitoring using the CIF video format is at least 5 Mbps;
1. The bit rate of each camera in the D1 video format is 1.5Mbps, that is, the data transmission bandwidth required by each camera is 1.5Mbps, and the data transmission bandwidth required by the 10 cameras is: 1.5Mbps (bit rate of the video format) × 10 (the number of cameras) = ​​15 Mbps (upstream bandwidth): namely, the network upstream bandwidth required for each local monitoring using the D1 video format is at least 15 Mbps;
2,720P (1 million pixel) video format The bit rate of each camera is 2Mbps, that is, the data transmission bandwidth required by each camera is 2Mbps, and the data transmission bandwidth required by the 10 cameras is:
2 Mbps (bit rate of video format) × 10 (number of cameras) = ​​20 Mbps (upstream bandwidth) Namely: 720P video format The network upstream bandwidth required for monitoring at each site is at least 20 Mbps; 1080P (2 million pixels) video The bit rate of each camera in the format is 4Mbps, that is, the data transmission bandwidth required by each camera is 4Mbps, and the data transmission bandwidth required by the 10 cameras is:
4 Mbps (bit rate of video format) × 10 (number of cameras) = ​​40 Mbps (upstream bandwidth) That is, the network uplink bandwidth required for monitoring of each place using 1080P video format is at least 40 Mbps.
3, the required bandwidth of CIF video format:
512 Kbps (bit rate of video format) × 50 (sum of the total number of cameras at the monitoring point) = 25600 Kbps = 25 Mbps (downlink bandwidth), that is, the network downlink bandwidth required for monitoring the center using the CIF video format is at least 25 Mbps;
4. Required bandwidth of D1 video format:
1.5Mbps (bit rate of video format) × 50 (sum of the total number of cameras at the monitoring point) = 75Mbps (downlink bandwidth), that is, the network downlink bandwidth required by the monitoring center using the D1 video format is at least 75 Mbps;
The required bandwidth of the 5,720P (1 million pixel) video format:
2 Mbps (bit rate of video format) × 50 (sum of the total number of cameras at the monitoring point) = 100 Mbps (downlink bandwidth), that is, the network downlink bandwidth required by the 720P video format monitoring center is at least 100 Mbps;
6. Required bandwidth of 1080P (2 million pixels) video format:
4Mbps (bit rate of video format) × 50 (sum of the total number of cameras at the monitoring point) = 200Mbps (downlink bandwidth), that is, the network downlink bandwidth required by the monitoring center using the 1080P video format is at least 200 Mbps;
7. Storage space calculation: stream size (unit: kb/s; ie: bit rate ÷8)×3600 (unit: seconds; number of seconds for one hour)×24 (unit: hours; long time of day)×30 (days saved) x 50 (the total number of camera videos to be stored at the monitoring point) ÷ 0.9 (loss of 10% of disk formatted) = size of required storage space (Note: 1TB = 1024GB for storage unit conversion; 1GB = 1024MB; 1MB=1024KB)
The required storage size for the 50-way storage of 30-day CIF video format video information is: 64×3600×24×30×50÷0.9=8789.1GB≈9TB
The required storage space for 50-channel D1 video format video information stored for 30 days is: 192×3600×24×30×50÷0.9=26367.2GB≈26TB
The required storage space for the 50-channel 720P (1 million pixel) video format recording information stored for 30 days is: 256×3600×24×30×50÷0.9=35156.3GB≈35TB
The required storage space for 50-channel storage of 1080P (2-megapixel) video format video information for 30 days is: 512×3600×24×30×50÷0.9=70312.5GB≈69TB
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