NAB Report: DASH Picks up Steam with Additional Support

在去年11月的流媒体西部大会上, the standing-room only crowd listened as the MPEG DASH Promoter's Group (DASH PG) espoused the yet-to-be-ratified International Standards Organization (ISO) standard for DASH (dynamic adaptive streaming over HTTP). 时间快进到2012年4月, and the ratified ISO/IEC 23009 DASH train seems to be picking up steam, 从微软到Wowza, Broadcast International to 弗劳恩霍夫实验室 have pledged support.

从媒体服务器的角度来看, Microsoft's announcement of Windows Azure Media Services, 我们昨天讲过了, 一开始并没有给我们留下DASH剧的印象, 但是一个博客post on the Microsoft Media Platform team blog brings DASH front and center as part of the Azure strategy.

"Taking advantage of similarities between Smooth Streaming and DASH,这篇博文写道, "Windows Azure Media Services will add support for DASH Live Profile later this year so that both Smooth Streaming and DASH devices can access the same live and on-demand video presentations using either manifest format."

In an even more straightforward signal of DASH adoption on the Microsoft roadmap, the blog noted that the addition of DASH in Windows Azure Media Services "will enable a smooth (pun intended) transition to DASH for millions of devices and services currently using Smooth Streaming".

Wowza Media Systems, whose Wowza Media Server 3.我们两天前就谈过了, also announced MPEG DASH support alongside an announcement that the company is now part of the promoter's group.

"Wowza joined DASH-PG in an effort to help avoid fragmentation of the multimedia HTTP streaming market,Wowza的一份新闻稿指出, calling protocol fragmentation "one of the major challenges facing content and service providers today." This is not to be confused with media fragmentation, as one of the primary benefits of DASH is the Base ISO media container format in combination with MP4 fragments (fMP4).

With Microsoft and Wowza joining Adobe, which had 二月中公布 that it would showcase an end-to-end DASH delivery solution at the 2012 Mobile World Congress (MWC), the big three server solutions now all have roadmaps to support DASH.

Adobe's showcase at MWC was interesting for its use of various ecosystem companies: shown in the Qualcomm booth, the demo was developed and implemented by Harmonic (which supplied the encoder), Akamai作为CDN合作伙伴, and Qualcomm (supplying the client player).

在编解码器方面, Broadcast International announced a few weeks ago that it, 太, 加入MPEG是什么意思.

"Joining the DASH Promoters Group allows us to highlight the strength and flexibility of CodecSys as the industry is coalescing around MPEG DASH creating a singular standard for streaming protocols,史蒂夫·琼斯说, general manager at Broadcast International. 由微软创立, Netflix和高通, DASH-PG is comprised of a cross section of industry leaders across the multimedia and video delivery ecosystem."

Broadcast International's CodecSys is a multi-codec video compression technology geared toward intermittent networks such as cable, IP, 卫星和无线网络.

另一个主要的编解码器制造商, 弗劳恩霍夫实验室, also threw its weight behind DASH at both MWC and this week's NAB conferences. Best known for its MP3 and Advanced Audio Codec (AAC) audio compression schemes, Fraunhofer sees DASH as a vehicle for its surround-sound and high efficiency codecs such as the HE-AAC multichannel codec.

根据Harald Popp的说法, head of the Multimedia Realtime Systems department at Fraunhofer IIS, the laboratory "has been actively involved in the development and standardization of MPEG DASH from the beginning [and the] AAC family of audio codecs natively complements the MPEG ecosystem of H.264 video, MP4 file format and MPEG DASH transport".

NAB continues until Thursday, April 19, 2012, at the Las Vegas Convention Center.