Low latency with HTTP-streaming (segment-based) technologies is a challenge. In particular MPEG-DASH is gaining adoption among international industry consortiums such as DVB with DVB DASH or ETSI with HbbTV 2.0 (not published yet), with a growing focus on live use-cases. For such applications, latency is a concern.
In this article, we will show you how the GPAC team studied the impact on the overhead of HD streaming with very low latency using MPEG-DASH and demonstrated that overhead on the transport side is negligible, in the order of 1%. At 1% overhead, we could demonstrate a 240ms latency. With such a low latency, interactive or bidirectional applications such as video conferencing or live streaming with voting become possible.
Of course such low latency can only be safely reproduced in local network conditions. Yet it shows that the latency is not due to the MPEG-DASH technology but rather to the network conditions. It also shows that a few technical choices can dramatically reduce the latency.
All the tools used for this demonstration are available as free software. Feel free to try and contact us if you have any questions. (…)