**1. Market Background**
With the rapid advancement of computer and network technologies, especially the continuous improvement of video codec techniques, increased computing power, and the widespread adoption of broadband, real-time video applications over the internet have become increasingly common across various industries and government sectors. In fields such as banking, broadcasting, oil, and power, numerous successful implementations have already been made.
When we think about real-time video applications on the internet, we often consider video conferencing, live TV streaming, distance learning, and similar services. These applications demand high performance from both hardware and software, requiring high frame rates and low bit rates, which in turn necessitate strong processing capabilities—both in terms of algorithms and chip performance. To achieve this level of performance, specialized and expensive equipment is typically required.
In the case of network-based digital video surveillance systems, the security industry has unique requirements due to its nature. These systems often involve a large number of data collection points, leading to the need for many encoding devices. Compared to other real-time video applications, cost becomes a more sensitive factor in this sector.
Traditionally, digital video surveillance systems were based on local or private networks. However, real-world conditions often make it difficult to maintain such stable network environments, limiting the ability of system integrators to provide comprehensive solutions. For example, a bank's ATM centralized monitoring system may require an internet-based solution that combines broadband with narrowband support.
ATMs typically rely on private network connections for data transmission, but they also need 24/7 video surveillance. Balancing business data stability and smooth video transmission within the same network can be challenging. Therefore, using broadband lines for video transmission is often necessary. Considering operational costs, many ATMs don’t need constant video transmission; instead, they only activate monitoring when an anomaly occurs or during periodic checks. In such cases, renting a line all year round isn't efficient, so alternatives like ADSL, ISDN, or even dial-up connections are used.
In recent years, domestic manufacturers have introduced cost-effective, high-performance video and audio compression cards and network monitoring equipment, making it possible to implement internet-based digital video surveillance systems, such as those for ATM monitoring.
**2. Overview of Requirements**
As part of a complete solution, one key challenge is managing dynamic IP addresses. Whether using a standard phone line, ISDN, or ADSL, if the connection uses a dynamic IP address, this issue must be addressed. Dynamic IP access means users receive a public IP address each time they connect via dial-up, which changes after each session. This makes it difficult for remote systems to consistently locate the device.
If only one side (like the ATM) or the other (the monitoring center) uses dynamic IP, it’s easier to manage. In point-to-point communication, if one party knows the IP address beforehand, they can establish a connection and retrieve the other’s IP. However, when both sides use dynamic IPs, it becomes problematic. After connecting, neither party knows the other’s current IP address, making communication impossible.
This challenge requires a reliable way to track and update IP addresses dynamically, ensuring seamless connectivity between the monitoring center and remote devices.
**3. Solution Implementation and Comparison**
Two main approaches can be used to solve the dynamic IP issue.
**1> Apply for a Dynamic Domain Name**
Several companies offer dynamic domain name services, allowing a fixed domain name to be associated with a changing IP address in real time. This enables consistent access to a device regardless of its current IP. Users register for a domain, install provided software, and the system automatically updates the IP whenever the device connects.
This method is simple to implement, requiring minimal code changes. It offers good stability, as professional providers ensure 24/7 uptime. For smaller systems, the cost is relatively low, as each device only needs a service fee. However, for large-scale deployments, the cumulative cost can become significant. Additionally, customization options are limited, as the service is standardized.
**2> Custom IP Address Resolution Server**
Another approach involves setting up a custom IP address resolution server. This can be done either by developing the software internally or purchasing a module. The server stores aliases and corresponding IP addresses, enabling devices to find each other using names rather than IP addresses.
This solution is more scalable and cost-effective for large systems, as it eliminates recurring service fees. It also allows for additional features like authentication, billing, and group management. However, it requires more development effort compared to the dynamic domain name method.
Both methods are mature and practical, offering different trade-offs depending on the scale and needs of the system.
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