High Efficiency Streaming Protocol
High Efficiency Streaming Protocol (HESP)
High 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
HTTP-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
Work 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
- ↑ "What is the High Efficiency Streaming Protocol (HESP) and why does the video industry need it?" (in en-US). https://www.theoplayer.com/blog/what-is-the-high-efficiency-streaming-protocol-hesp-and-why-does-the-video-industry-need-it.
- ↑ "THEO Technologies and Synamedia form HESP Alliance" (in en-us). https://www.digitaltvnews.net/?p=34815.
- ↑ "Rethink report debunks low latency hype" (in en-us). https://www.csimagazine.com/csi/Rethink-report-debunks-low-latency-hype.php.
- ↑ "HESP: Sub-second Latency, Fast Channel Change and Improved ABR over Standard CDNs" (in en-us). https://www.streamingmedia.com/Articles/ReadArticle.aspx?ArticleID=153579.
- ↑ "HESP: What a HESP protocol is and how it changes streaming for the better" (in en-us). https://gcore.com/learning/what-a-hesp-protocol-is-and-how-it-changes-streaming-for-the-better/.
- ↑ "HESP - Informational Draft" (in en-us). https://datatracker.ietf.org/doc/draft-theo-hesp/.
- ↑ "High Efficiency Streaming Protocol (HESP)" (in en-US). https://theiabm.org/bamproducts/high-efficiency-streaming-protocol-hesp/.
- ↑ "HESP Alliance Members" (in en-US). https://www.hespalliance.org/members.
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