Live Streaming & Webcasting

The Ultimate Guide to the Secure Reliable Transport (SRT) Protocol

Video streaming technology has changed and developed rapidly over time. Latency has significantly reduced, which has resulted in higher and better quality. SRT protocol is a reliable and great streaming that has helped facilitate an enhanced streaming experience. Even though the technology has become more advanced, this streaming protocol has provided an array of benefits. It has enhanced the streaming experience for multiple industries and has become more accessible for users of any experience. Secure reliable transport is one of the most advanced and reliable protocols in the video streaming industry.

For many organizers, this protocol offers the best performance that enhances the overall streaming experience. SRT video streaming provides a secure and reliable stream of data with the most advanced features such as error correction. In this blog, we will dive into the SRT streaming protocol and understand how it works. Furthermore, we will take a look at its benefits and more about the protocol.

What Is Secure Reliable Transport (SRT) Protocol?

SRT protocol was developed by Haivision, it is an open-source protocol that is promoted by the SRT alliance. It is designed to deliver secure, high-quality, and low-latency streaming across various networks. The protocol combines the aspects of user datagram protocol(UDP), like low latency and error checking, to match the reliability of TCP/IP. While transmission control protocol/ internet protocol handles all data formats, allowing SRT to deliver high-performance streams. 

Maintaining high quality with low latency is crucial in the video streaming industry and secure reliable transport protocol is designed to adapt and deliver high-quality results. Meaning, that SRT can bring the best quality of video content over the worst network conditions while maintaining the integrity and quality of video.

How Does SRT Protocol Work?

The SRT protocol uses multiple advanced techniques to ensure high quality videos with low latency streaming over different networks. It can easily solve the typical latency challenges associated with live video streaming such as packet loss, bandwidth limitations, and jitter. However, it relies on different characteristics that are mentioned below to function seamlessly.

Transport Layer

SRT video streaming operates over the transport layer of the OSI model. It is typically over the user datagram protocol, which is chosen for lower latency as compared to transmission control protocol (TCP). But SRT adds an extra layer of its own mechanism for reliability and security.

Error Recovery

SRT consist of built-in error recovery mechanisms that can easily handle packet loss and other issues that can be experienced through internet-based transmission. It uses retransmission to ensure that lost packets are retransmitted, maintaining the integrity and seamless video streams.


Maintaining security is a crucial aspect of secure reliable transport protocol. It provides end-to-end encryption through advanced encryption standards (AES) to ensure that the video content is secure during transmission. 

Congestion Control

SRT includes adaptive bitrate control along with a congestion controlling mechanism. It can optimize the streaming experience based on the network conditions. This helps in adjusting the video bitrate to varying network bandwidth and prevents congestion.

Buffer Management

To store incoming packets, the SRT protocol employs a buffer that allows jitter mitigation. This helps in smoothing out the variations in network latency and ensuring a consistent and high-quality streaming experience.


SRT video streaming supports tunnelling that allows it to be used in situations where firewalls and network restrictions might affect the transmission. The protocol makes it possible to pass through network infrastructure without any interference.

API and Libraries

SRT provides application programming interfaces and libraries to integrate into various applications and devices. This facilitates seamless implementation of SRT in a wide range of streaming solutions.

Advantages of SRT video streaming

SRT suggests its primary advantages through the name itself: security and reliability. However, it has many other benefits that have made a spot for SRT among the top choices for streamers. Here are the top advantages of using the SRT protocol.

Quality of Streaming

Secure reliable transport is designed to maintain high-quality video streaming by automatically adjusting to network conditions. It can easily adapt the fluctuating bandwidth and packet loss to ensure a smooth experience.

Security of Video

SRT incorporates encryption and authentication mechanisms that ensure the security of video content during transmission. It is crucial for protecting sensitive and premium content from unauthorized access. 

Reliability of Protocol

Secure reliable transport protocol is built for reliability, it provides error correction and packet retransmission capabilities. This helps in overcoming issues like packet loss and ensures that the video stream reaches the destination without any disruption.

Compatibility With Codecs

The secure reliable transport protocol is compatible with many codecs such as H264, AAC, etc. This compatibility makes it easier to find compatible devices and applications that can work with these protocols.

Low-Latency for Better Quality

SRT protocol optimizes low-latency streaming, making it suitable for real-time applications. It is particularly important during live streaming of events, interactive content, and any scenario where minimizing the delay between source and destination is important.

Easy Travel Through Firewall:

SRT is designed to easily go through firewalls and network address translation (NAT) setups. It simplifies the development of video streaming solutions in various network environments, making it easily accessible to a wider audience. 


SRT protocol is open source, which means its source code is freely available and can be audited and modified. It fosters innovation, transparency, and collaboration within the streaming community. 

Affordability of the Protocol

Being an open-source protocol, SRT is a cost-effective solution that can be compared with other alternatives. It allows many industries to implement robust and secure video streaming without any higher fees.

On what devices, SRT is compatible?

The number of products and services that use SRT video streaming is increasing with multiple organizations across the globe. There is a wide range of industry applications that include video encoders and decoders, OTT platforms, content delivery networks (CDNs), etc. Other than these, here are some more of the compatible devices and services SRT can leverage.

Encoding Applications

Many hardware encoders can easily support SRT protocol, and it’s an advantage when delivering capture, streaming, and recording the content in 4K or UHD.

Capture Cards

SRT-enabled capture cards can provide multiple options for high-definition and high-density video like 4K in a controlled environment.

Decode Cards

Display cards can take SRT-compliant streams from any device and through any location across the globe. These cards are a great benefit for non-entertainment use cases such as crisis management applications or security.

Encoders or Decoders

Professional graded encoders or decoders support many streaming protocols that include secure reliable transport protocols. It can transmit live camera dreams in 4K or HD over different networks. Moreover, the feeds can be optimized for integrations into a studio environment or any other.

Final Thoughts

SRT protocol is an advanced and secure UDP-based system that is designed to transmit high-quality video content over unstable and unpredictable networks. It features encryption of data security and congestion control mechanisms to prevent latency issues. This makes it an ideal system or transport protocol for streaming applications that require enhanced reliability and security. Moreover, the SRT protocol is also an important aspect of live streaming services to provide an enhanced and seamless viewing experience.

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Saransh Maurya

A passionate content writer with a talent for creating captivating and informative pieces. With a strong focus on delivering high-quality tailored content, by brings expertise and a passion for engaging readers through their writing.

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