Foreword:
SRT is a very popular open source low-latency video transmission protocol nowadays. Using SRT reliable transmission technology, it can successfully realize the safe and reliable high-definition video transmission and distribution under the ordinary Internet environment and between multiple places.
1. SRT development history
SRT is an SRT alliance jointly created by Haivision and Wowza. Since SRT became an open source technology in 2017, more than 130 companies have supported the open source project by supporting the SRT alliance. His suppliers and end users work together to increase the industry’s awareness of SRT and use it as a common standard for low-latency video transmission on the Internet.
There are currently 50 SRT-enabled products on the market, including IP cameras, encoders, decoders, video gateways, OTT platforms and CDNs. The SRT protocol is used by thousands of organizations in many applications and markets around the world.
2. What is SRT
SRT is the abbreviation of (Secure Reliable Transport). SRT was established by Haivision and Wowza to manage and support the open source application of the SRT protocol. This organization is committed to promoting the interoperability of video streaming solutions and promoting the collaboration of pioneers in the video industry. Realize low-latency network video transmission.
3. SRT protocol features
Three major features: safety, reliability, and low latency.
In terms of security, SRT supports AES encryption to ensure end-to-end video transmission security.
In terms of reliability, SRT uses forward correction technology (FEC) to ensure the stability of transmission.
In terms of low latency, because SRT is built on top of UDT protocol, it solves the problem of high transmission delay of UDT protocol. The UDT protocol is based on the UDP network communication protocol.
SRT solves the problem of complex transmission timing and can support real-time transmission of high-throughput files and ultra-definition video.
4. SRT protocol advantages
1) SRT allows direct connection between signal source and target, which is in sharp contrast to many existing video transmission systems, which require a centralized server to collect signals from remote locations and redirect them to one Or multiple destinations.
2) The architecture based on the central server has a single point of failure, which may also become a bottleneck during periods of high traffic. The transmission of signals through the hub also increases the end-to-end signal transmission time and may double the bandwidth cost, because two links need to be implemented: one from the source to the central hub, and the other from the center to the destination.
3) By using direct connections from source to destination, SRT can reduce latency, eliminate central bottlenecks, and reduce network costs.
5. Compare SRT with common transmission formats
SRT and most other video streaming formats currently on the market (such as RTMP, HLS and MPEG-DASH). Compared with several features:
1) SRT is an open source solution that has been integrated into multiple platforms and architectures, including hardware-based portable solutions and software-based cloud solutions.
2) SRT can work well on connections with delays ranging from a few milliseconds to a few seconds. Can handle long network delays.
3) SRT has nothing to do with the load. Any type of video or audio media, or indeed any other data element that can be sent using UDP, is compatible with SRT. Support multiple stream types.
4) SRT sending supports multiple concurrent streams. Multiple different media streams such as multiple camera angles or optional audio tracks can be sent via parallel SRT streams sharing the same UDP port and address on a point-to-point link.
5) The handshake process used by SRT supports outbound connections without the need to open dangerous permanent external ports in the firewall, thereby maintaining the company's security policy. Enhanced firewall traversal.
6) The SRT endpoint establishes a stable end-to-end delay profile, eliminating the need for downstream devices to have their own buffer to deal with changing signal delays. The signal time is accurate.
7) Kiloview provides technical output for NewTek and other companies in the United States. It is the official NDI product supplier of NewTek. It has powerful streaming media service functions. In addition to supporting general protocols such as RTSP/RTMP, it also supports security Onvif protocol, SIP protocol, and NDI protocol ( (Customizable), SRT protocol (customizable), GB/T28181 (customizable) and other streaming media service agreements;
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