Limelight Promises Sub-Second Live Video Latency Using WebRTC
With latency times of 30 seconds or more the bane of live sports publishers, CDN Limelight Networks has chosen an opportune moment to announce Limelight实时流媒体, a solution that it promises to bring sub-one second latency to the global delivery of live video.
Limelight's solution relies on WebRTC and its own global network of edge servers. Traditional HTTP live streaming breaks videos into 10-second chunks and uses 3 chunks as a buffer, Limelight product manager Heath Kerley explains. But Limelight has created a plug-in-free solution that avoids those obstacles.
"Limelight addressed these issues by using the open and scalable industry-standard WebRTC technology to deliver reliable, 宣传, real-time video streaming using the UDP data transfer protocol, Kerley说. "UDP eliminates the protocol chattiness of HTTP, 而且没有缓冲, which addresses the most significant contributor of latency."
Its solution relies on adaptive bitrate streaming to avoid the need for buffering. If connectivity becomes a problem, the solution switches to a lower-quality stream.
Besides live sports, Limelight sees opportunities in online gambling, healthcare, and security.
While Limelight isn't the first vendor to claim to have solved live video latency, it's taking a different approach, 这是有回报的.
"Other solutions to lower latency involve reducing the chunk size for HLS and DASH streaming. They reduce latency but you can’t achieve sub-second with any chunk steaming protocol," Kerley说. "Another option is the use of a relatively new protocol QUIC, which also uses UDP as described above. The problem with QUIC is it is not supported in popular browsers, and requires viewers to install a plug-in, 不受欢迎."
Limelight is demonstrating Limelight实时流媒体 at IBC. It will be commercially available as a standalone product in early Q4.
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