High Efficiency Streaming Protocol
This article may be too technical for most readers to understand. (November 2023) |
High Efficiency Streaming Protocol (HESP)
editHigh Efficiency Streaming Protocol (also known as HESP) is an HTTP-based adaptive bitrate streaming protocol that enables high-quality streaming of media content over the Internet delivered from conventional HTTP web servers..,[1] just like HLS and DASH. The technology was developed by THEO Technologies and made available via the HESP Alliance, which has Synamedia and THEO Technologies as founding members.[2] HESP brings sub-second latency and a fast channel change, and is seen as a challenger of Low Latency HLS (LL-HLS, first released in 2009) and Low Latency DASH (LL-DASH, standardized in 2012).[3]
Architecture
editHTTP-based streaming protocols such as HLS and DASH typically use a segment-based approach. This means a video is cut up into TCP segments of a few seconds each, which requires video players to wait until the start of a new segment to start playback. This approach increases channel change times and introduces additional latency. HESP leverages a frame-based streaming approach, which does not require a trade-off between live latency and channel switching time.[4]
When all components of the video workflow are optimized for low latency, HESP can provide for sub-second latency.[5]
HESP requires implementation in the packager and player, and support for range requests and Chunked transfer encoding (CTE) in the CDN.[6]
Standardization
editWork on HESP started in 2018; it became an IETF information draft in May 2021[7]
The HESP Alliance, launched in 2020, promotes and catalyzes the adoption of HESP. It consists of streaming vendors and media companies, including Synamedia, THEO Technologies, G-Core, EZDRM, Mainstreaming, NativeWaves and Hoki. The HESP Alliance technical working group is focused on further advancing the HESP standard[8]
References
edit- ^ "What is the High Efficiency Streaming Protocol (HESP) and why does the video industry need it?". THEO Technologies. Retrieved 2023-07-04.
- ^ "THEO Technologies and Synamedia form HESP Alliance". Digital TV News. Retrieved 2023-07-04.
- ^ "Rethink report debunks low latency hype". CSI Magazine. 25 May 2022. Retrieved 2023-07-04.
- ^ "HESP: Sub-second Latency, Fast Channel Change and Improved ABR over Standard CDNs". Streaming Media. 22 June 2022. Retrieved 2023-07-04.
- ^ "HESP: What a HESP protocol is and how it changes streaming for the better". Gcore. Retrieved 2023-07-04.
- ^ "HESP - Informational Draft". IETF. Retrieved 2023-07-04.
- ^ "High Efficiency Streaming Protocol (HESP)". IABM. Retrieved 2023-07-04.
- ^ "HESP Alliance Members". HESP Alliance. Retrieved 2023-07-04.