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Encoding for Adaptive Streaming by Jan Ozer

Encoding for Adaptive Streaming by Jan Ozer | Social TV is everywhere | Scoop.it

Adaptive streaming technologies like Adobe’s Dynamic Streaming, Microsoft’s Smooth Streaming, and Apple’s HTTP Live Streaming, use multiple encoded files to deliver the optimal viewing experience to video consumers watching on a range of devices, from mobile phone to workstation, via a range of connections, from FIOS to cellular. Though there are differences in implementation, all adaptive technologies switch streams based upon heuristics like CPU utilization or buffer size. That is, if the player detects that buffer levels are too low, it may choose a lower data rate stream to avoid running out of data. If CPU utilization gets too high and frames start dropping, it may request a lower resolution file that’s easier to decode.

 

While most of the technology that enables stream switching is lodged in the player or streaming server, there’s lots to do on the encoding side to produce streams that switch smoothly. In this article, I’ll outline the key differences between producing for single stream delivery and producing for adaptive streaming.


Via Nicolas Weil
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HTTP video accelerates at IBC2011

HTTP video accelerates at IBC2011 | Social TV is everywhere | Scoop.it

The last thing digital video needs is new jargon that fuels another cycle of hype. So here’s the quick case for spotlighting hypertext transfer protocol (HTTP) video: In tech years, HTTP is not new, but ancient, or as old as the Internet; HTTP linked to video is proving to be a strong growth engine.

 

The longer defense is that HTTP provides a hook for the “multi-screen” and “over-the-top” (OTT) themes that dominated IBC 2011. The key is that in contrast to IPTV-centric protocols, HTTP focuses on the client—on whatever device and at the end of whatever network—and its so-called GETs, or means of retrieving information or video from a network server.

 

This protocol and its adaptive bit-rate (ABR) cousins have yet to conquer the world. In fact, a competing theme at IBC 2011 was “hybrid,” whose resurgence indicates “more longevity in broadcast,” said ADB VP Strategy Paul Bristow. Moreover, there were other categories of technology on display: advanced advertising, HD, 3D, Super Hi-Vision, content distribution networks (CDNs), conditional access (CA) and digital rights management (DRM) systems.


Via Nicolas Weil
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