SRT (Secure Reliable Transport) Protocol

High-quality professional media transport over the Internet is maturing rapidly, creating the need for open ecosystems in which multiple vendors can interoperate. Secure Reliable Transport (SRT) is a free open source video transport protocol and technology stack that is available for anyone to use. It is endorsed and implemented by many vendors in the industry.

Experience the transformation in the media broadcast industry as internet protocol (IP) joins satellite and cable as a media transport option. Over-the-top (OTT) or internet distribution is set to dominate global broadcasting. IP is replacing SDI for facility connectivity and media contribution, enabling seamless workflows.

Embrace the need for agility, ultra-high resolution video, and improved infrastructure to meet the growing demands of OTT. This rapid evolution relies on secure reliable transport (SRT) technology. SRT transport ensures high-quality and low-latency video streaming, empowering broadcasters to deliver exceptional content experiences. Join the future of broadcasting with Net Insight’s comprehensive SRT video streaming solutions.”

SRT transport

It is essential to highlight the considerations surrounding RTMP as a video contribution protocol and its inherent limitations. Developed without interactivity in mind, RTMP may present challenges in terms of latency and video quality. Discover the advancements of SRT transport, a superior alternative that outperforms RTMP in latency and maximum bandwidth, as evidenced in Haivision’s comprehensive comparison of the two protocols.

Embrace the future of live and on-demand streaming with SRT, the groundbreaking solution designed to reduce latency and meet the demands of modern video delivery. According to Deloitte consultants, legacy protocols like RTMP will be surpassed by SRT’s secure reliable transport capabilities. Unlock the full potential of SRT video streaming with Net Insight’s cutting-edge solutions.

Specifically, SRT transport is designed to manage and solve:

  • Packet loss (packets that the router discards)
  • Jitter (packets that arrive at the wrong time)
  • Latency (delay between when the video is captured and when it plays on viewers’ devices)
  • Changes in bandwidth (fluctuations in the capacity between two points)

In this way, SRT enables a layer of error correction that reduces the need for expensive network infrastructure.

UDP and TCP are both core components of the internet protocol suite, residing in the transport layer. SRT takes some of the best aspects of User Datagram Protocol (UDP), such as low latency, but adds error-checking to match the reliability of Transmission Control Protocol/Internet Protocol (TCP/IP). While TCP/IP handles all data profiles and is optimal for its job, SRT can address high-performance video specifically. By combining the speed of UDP and the reliability of TCP, SRT provides the following benefits.

SRT networking benefits

The benefits of SRT as claimed by the SRT Alliance, include:

  • High quality: Provides professional, high-grade video across any network — withstanding up to 10% packet loss without detectable degradation.
  • Resilient: Maintains stream integrity by accounting for packet loss, jitter, and fluctuating bandwidth.
  • Cost-effective: Replaces expensive satellite networks or rigid MPLS networks with affordable and flexible public internet.
  • Interactive: This allows you to deliver two-way, interactive video from anywhere.
  • Low latency: Enables near real-time IP communications as fast as UDP with the reliability of TCP.
  • Media-agnostic: Acts as a wrapper around your content — whether MPEG-2, H.264 or HEVC.
  • Firewall friendly: Reliably streams from unknown locations and event centers without requiring additional IT resources.
  • Secure: End-to-end 128/256 bit AES encryption makes sure your content is protected from contribution to distribution

One notable limitation of SRT is that it’s not as widely supported for playback as technologies like HTTP Live Streaming (HLS). For that reason, most SRT-based workflows leverage a streaming server or service to repackage content.

The SRT Alliance

The SRT Alliance of supporting vendors was created in 2017 to promote the industry-wide recognition and adoption of SRT as a common standard for all low-latency internet streaming.

Haivision subsequently released SRT on GitHub to encourage interoperability, as well as a comprehensive technical review that serves as the specification. This makes it simple to verify connectivity without costly hardware or software solutions.

Microsoft announced support for the protocol in 2019, making SRT an ingest option alongside RTMP.

Since then, Haivision has launched SRTHub a cloud-based service for routing media across the Microsoft Azure backbone.

Net Insight is a member of the SRT Alliance. Joining the SRT Alliance is in line with Net Insight’s strategy to embrace open technology for transporting professional high-quality media content over the Internet.

SRT Open Source

Discover the power of the SRT Open Source project, an initiative driven by the collaborative SRT Alliance community. Comprised of industry leaders and developers, this community strives to enhance internet video transport by continuously refining the open-source SRT.

SRT transport, known for its secure and reliable nature, enables lower latency and superior performance in video streaming. Embracing Mozilla Public License 2.0 (MPL-2.0), open-source SRT strikes a perfect balance. It not only encourages adoption but also fosters contributions from a diverse community of adopters, driving continuous improvement.

Any third party is free to use the SRT source in a larger work regardless of how that larger work is compiled. Should a third party make source code changes, they would be obliged to make those changes available to the community.

Open source is designed to deliver interoperability and longevity with large-scale adoption.

CASE STUDIES

World’s largest Nimbra networks to HD

EBU has selected Nimbra platform for the Eurovision fiber network

The European Broadcasting Union (EBU)

World’s largest alliance of public service media organisation

Since 2004, when the EBU selected Net Insight’s Nimbra platform, the EUROVISION Fibre Network (FiNE) has evolved with Net Insight’s latest products and features.

The EUROVISION satellite and fibre network is one of the largest and most rock solid in the world. It delivers more than 80,000 hours of programming every year, the majority of which is live sports. Its undisputed reputation for flexibility and reliability is reflected in the prestigious events it regularly carries on the EUROVISION network.

“We continue our solid relationship with Net Insight for the development of our network since we aim to be the standardbearer for QoS and reliability around the world.”

Related resources

WHITE PAPER

Cloud Ingest of Live Video

As cloud production becomes an integral part of broadcasters’ live workflows, the corresponding cloud infrastructure becomes an integral part of the media transport network.

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FAQ

SRT (Secure Reliable Transport) is a transport protocol designed for secure and reliable streaming of video and audio content over unpredictable networks like the internet, ensuring low latency and high quality.

SRT uses encryption and other security measures to protect video streams from unauthorized access and tampering, ensuring the security and privacy of the transmitted content.

Yes, SRT is ideal for remote production scenarios as it allows for high-quality, low-latency video transmission over long distances, making it suitable for live broadcasts and remote collaboration.

SRT offers advantages like low latency, high reliability, and secure transmission, making it preferable over other protocols for applications requiring real-time video and audio streaming.

SRT is designed to be adaptive to varying network conditions, ensuring stable and high-quality streaming even in challenging network environments.