This document discusses challenges in achieving low latency live streaming in a real-world deployment. It notes that while HTTP adaptive streaming technologies allow for high quality video, supporting multiple streaming standards like DASH, HLS, and MSS increases complexity and latency. The document describes experiments testing how changing video format, segment duration, and DVR window length impact end-to-end latency on a testbed system. Shortening segment duration reduced latency while increasing the DVR window had a negative effect on latency.

1. Towards Low Latency Live Streaming: Challenges in a Real-World Deployment
Reza Shokri Kalan1
, Reza Farahani2
, Emre Karsli1
, Christian Timmerer2
, Hermann Hellwagner2
1
Digiturk beIN Media Group, Istanbul, Turkey
2
Christian Doppler Laboratory ATHENA, Alpen-Adria-Universität, Klagenfurt, Austria
• With the advancement of low‐latency live streaming applications and users’
growing interest in streaming of live contents, the demand for low‐latency
services is higher than ever.
• HTTP Adaptive Streaming (HAS)‐based streaming solutions are a way toward
effective video streaming in high quality.
• OTT providers use a combination of multiple streaming technologies,
e.g. , DASH, HLS, and MSS to satisfy the experience of their connected
heterogeneous clients. ⇒ Different streaming standards require different file or
container formats ⇒ Utilizing a unified format compatible with all HAS clients
and finding the effect of some parameters on the end‐to‐end latency may
disclose simple but useful hints to OTT providers for reducing cost and latency.
Motivation
CONCLUSION
Testbed Design
Evaluation Results
• Impact of Changing Video Format (a: Elemental encoder , b: DogalZeka encoder )
• Impact of Changing Segment Duration (c: Elemental encoder , d: DogalZeka encoder )
• Impact of Changing DVR Window Length (e: Elemental encoder , f: DogalZeka encoder )
• We introduce small but notable steps for OTT providers to achieve low-latency live
streaming before jumping to MPEG CMAF.
• Our investigation over a real-word testbed showed that:
■ shortening segment duration reduces end-to-end latency.
■ increasing DVR window length negatively affects end-to-end latency.
• Focusing on DRM-sensitive contents and designing a CMAF- and CTA-enabled
(i.e. CMSD and CMCD) testbed are interesting items for future work.
Conclusion and Future Work