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This article focuses on the live streaming DASH features enabled by Azure Media Service, and how they can be used to deliver live and video on demand adaptive streaming to Web browsers and new devices of all types, which are adding support for the DASH standard.

This enables the introduction of DASH to new browsers and devices while maintaining compatibility with legacy players and formats. The ability to dynamically package media segments in realtime is essential for low latency live streaming, as well as efficient multiplatform support. Adaptive streaming has enabled the explosive growth of video over the Internet now the majority of Internet data because it allows a huge variety of video devices to each select a compatible audio and video encoding from multiple options, and dynamically select a higher or lower bitrate in response to network conditions in order to delivery continuous video at the highest quality the network and device can support.

HTTP adaptive streaming takes advantage of web servers and Content Delivery Networks CDNs to support millions of simultaneous streams from the same cached Media Segments without additional server and backbone load.

Browser plugins, such as Silverlight and Flash, have been deprecated for security and complexity reasons, so native support for scripted DASH playback in HTML5 browsers is necessary to replace proprietary streaming formats. Developing and supporting separate applications for each type of device costs money, reach, and time to market, so a single Web page will likely replace multiple apps when new HTML5 browsers reach sufficient market share.

Azure Media's specific subset of features provides compatibility with the widest range of delivery scenarios and players, and supports important uses cases such as targeted advertising and DRM content protection in highly scalable and available systems i. Post to push MP4 streams or multibitrate encoded movie fragments that are packaged as CSF movie fragments when Media Segments are requested after a Program from a Channel is assigned a Streaming Locator origin server.

The duration of AVC Coded Video Sequences should be about 2 seconds, since that determines video Segment duration, and 2 second Segments are optimal for rapid bitrate adaptation balanced against video codec efficiency. Two second Segments also allow relatively low latency between the arrival of a video frame at the live encoder, and its presentation on a player. Actual latency depends on the buffering logic of each player and the reliability of its network connection.

Latency is typically tuned to anywhere from a few seconds to thirty seconds. Requesting not yet available Segments results in a cascade of HTTP not found errors between Content Delivery Network CDNs and origin servers, so can clog a network like a denial of service attack if repeated by thousands of players.

At the start of the Preview period, simple track combinations of AAC audio and AVC video are supported, but multiple tracks and additional codecs will be validated before General Availability is announced. A consistent event message format allows delivery of program insertion messages already present in broadcast video e. Simple players have the option to ignore update events in the media stream, and instead download an MPD update with a frequency approximately equal to the Segment duration e.

Server is maintaining a PVR time shift buffer depth of 4 minutes behind the live edge in this example default is an infinite PVR buffer, where all the recorded video is random accessible. This results in the best performance with existing decoders, and the most seamless bitrate switching across a wide variety of players, some of which may glitch when their media pipeline and decoders re-initialized. An exact Segment Timeline also enables synchronization of Segment timestamps and URLs between independent encoders and servers operating from the same live feed, and time based synchronization of events, such as ad insertion.

The t attribute identifies the media timestamp of the first Segment in the Period, which is coincident with UTC availabilityStartTime, in this case with a single Period starting at zero presentation time.

The duration, timestamps, and timescale of live encoded streams need not be altered for different presentations e. That fills the rolling 4 minute time shift buffer, and an MPD need not list more than the available Segments when it was published. This example has 8 different Representations in a video Adaptation Setand each is encoded with a bitrate and spatial subsampling that is a fraction of the source bitrate and image size.

This player is is based on the DASH. This player uses the latest development branch, which incorporates live streaming support. Microsoft Smooth Streaming Client 2.

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