This article shows a proof-of-concept implementation of Low-Latency DASH (LL-DASH) streaming in Video.js, a popular open-source media player for live and VoD OTT streaming. To my knowledge, LL-DASH is only supported by a limited number of players, such as the GPAC player, Dash.js and TheoPlayer. So I guess supporting it in Video.js could still be interesting to the community.
This LL-DASH implementation allows Video.js to achieve as low as 1 second latency (Figure 1), and an average latency of ~2 seconds. As seen in Figure 1, the DASH media segments are downloaded using the Fetch API, even though the initialization…
Overview
This article describes a server-side only method to reduce streaming startup delay by using HTTP/2 server push. In the context of OTT video streaming, the startup delay is defined as the time interval between when a viewer clicks the “play” button on the video player UI, and when she/he sees the first video picture on the screen. Depending on the network connectivity between a viewer and the CDN, OTT streaming startup delay can be as high as 2 seconds for VoD streaming. …
In this week, I had spent a few nights to build a low-latency DASH server that can stream live video in a way that conforms to the newly published LL-DASH specification. The server was built completely using open source tools. I also wrote some integration code to glue the different pieces together. In this article, I’m going to show how I built and tested the server.
In this March, the DASH Industry Forum (DASH-IF) published a new change request to the DASH IOP guidelines on low-latency modes for DASH live streaming (LL-DASH). This standard extension is based on the earlier…
A quick latency evaluation of Apple LL-HLS and the community-driven LHLS
There is an ongoing battle in the field of low latency live video streaming. Basically, 3 technologies (MPEG LL-CMAF, Apple LL-HLS and a community-driven LHLS) are competing for the title of the fastest live streamer. LL-CMAF is a MPEG-led effort on top of the existing low-latency MPEG-DASH technology. Apple’s LL-HLS is another low-latency standard that extends Apple’s HTTP Live Streaming (HLS) standard. There is also a community-driven low latency HLS variant which originates from Twitter’s Periscope platform, and is now led by companies such as Twitch and its parent company AWS, and JWPlayer. AWS recently announced a new Interactive Video…
Bo Zhang
Bo Zhang is currently a staff video system engineer at Brightcove. He works for the video research team on video delivery, playback and cdn.
