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What is the reason why RTSP is still in use today? many beginners are not very clear about it. In order to help you solve this problem, the following editor will explain it in detail. People with this need can come and learn. I hope you can get something.

As early as 1996, people began to use Netscape's browser to "surf the Internet" and search for information through Yahoo, and the first flip phone just came out. In the same year, the RTSP agreement was created.

Although many of its technologies have been abandoned by its peers (such as the Gopher protocol), RTSP has survived in the ever-changing technology world. Why is that? Today we will reveal to you the four reasons why RTSP is still in use today.

What is RTSP?

Real-time streaming Protocol (RTSP:Real Time Streaming Protocol) is a network transport protocol designed to send low-delay streams. The agreement was developed by experts from RealNetworks,Netscape and Columbia University in 1996. It defines how the data in the stream should be packed for transmission.

RTSP provides control of streaming media such as pause and fast forward, but it does not transmit streaming media data. The role of RTSP is equivalent to the remote control of streaming media server.

Like WebRTC, RTSP streams combine Real-time Transport Protocol (RTP) with Real-time Control Protocol (RTCP) for media streaming. To put it simply, RTSP initiates / terminates streaming media, RTP transmits streaming data, and RTCP controls and synchronizes RTP. In addition, RTSP can use SRTP to encrypt the stream to ensure the security of the data.

However, some vendors also have proprietary transport protocols. For example, RealNetworks's RTSP server software also uses its proprietary Real Data Transport (RDT).

Characteristics of RTSP

Client-server mode for a more friendly experience

Unlike WebRTC, RTSP operates in a simpler way. Because it does not execute all signaling and NAT of WebRTC. For each WebRTC connection, the user must maintain a separate signaling WebSocket connection.

With RTSP, there is only one connection per video subscriber / publisher client. So, RTSP can lighten the burden on the server, thus allowing more connections.

Strong compatibility and multi-device support

RTSP provides cross-device compatibility.

IP camera

IP cameras have been around since the 1990s, so they are one of the earliest devices in RTSP to adopt streaming media technology. To this day, IP cameras continue to use RTSP. IP cameras have a variety of uses, such as traffic surveillance, security, and even home surveillance.

Other Internet of things Devic

The use of drones is becoming more and more widespread, which has gone far beyond the use of hobbies. Using smartphones or laptops to control drones can guide them to real-time video of the scene, such as firefighters and U.S. Border patrols who have used drones to carry out missions.

In addition, aerial survey uses drones to check power lines, roads, and even for geological surveys, maintenance of infrastructure, and so on. With the increasing role of drones, manufacturers usually build RTSP into UAV software, which is also a common way to access UAV video sources.

Robot

From underwater vehicles to industrial testing and rescue assistance, robots are being used more and more widely. Because RTSP has very low latency, robot-based computer systems usually use RTSP for video transmission.

With the help of video, the operator can control the robot and perform various operations. The most influential ones are such as telesurgery and telemedicine robots, which allow doctors to communicate and work in remote areas.

Low pressure on the server, but lack of mobile support

Unfortunately, RTSP does not support mobile devices, which is its deficiency. But now there are many technical means to solve this problem. For example, EasyPlayer, the player of TSINGSEE blue rhinoceros video, can play RTSP on mobile.

As mentioned above, the RTSP streaming media server is less stressful than WebRTC. RTSP also provides the function of network load balancing to reduce server pressure and network bandwidth requirements.

Low latency, high performance

By using the efficient RTP protocol, RTSP achieves very low latency: for example, as low as 500ms when used with TSINGSEE blue rhinoceros video products. Because RTP is also the basic protocol of WebRTC, most RTSP are essentially simplified versions of WebRTC that achieve the same performance without complex operations.

To achieve this low latency, RTP sends video and audio data in small blocks suitable for fast transmission between the server and the client. Each data block is preceded by a RTP header. The RTP header and data are included in the UDP packet. As each packet is processed, subsequent packets may already be in the stage of decompression or demultiplexing.

In response to occasional packet loss, the RTP header contains timing information and a sequence number that allows the receiver to reconstruct the timing generated by the streaming source. Therefore, if there is any failure, it can be quickly organized in the appropriate order for streaming.

The structure of RTP incorporates essential information, thus simplifying the process of streaming media transmission. Therefore, it can effectively deliver the media stream with very low latency.

Why choose to use RTSP

RTSP is an excellent choice for real-time streaming video. Despite the rapid development of technology, the simple design of RTSP means that it is still indispensable and practical today.

Because the RTSP protocol is built on a client-server model, the server can easily handle a large number of RTSP streams. With its native support for various devices such as drones, the Internet of things and robots, it is also very compatible with various devices. Like WebRTC, RTSP uses RTP to transmit video and data streams. Therefore, the low real-time latency is one of the reasons why RTSP is so popular.

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