基于Sliverlight的高清视频网站
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MS Announces IIS "Smooth Streaming", Akamai announces "AdaptiveEdge for Silverlight"
Microsoft is introducing new Web server technology, called Internet Information Services 7.0 (IIS7.0) Smooth Streaming, that gives consumers instant start-up times and no buffering by adapting the quality of the video stream in real time based upon changing connectivity speed. This enables companies to boost brand awareness and advertising revenues by extending average viewing times. They can also benefit from unprecedented network scalability using distributed HTTP-based Web servers.
“Smooth Streaming is an evolution of proven Silverlight technology that has powered global online events,” said Scott Guthrie, corporate vice president of the .NET Developer Division at Microsoft. “Our objective has always been to provide a platform that enables next-generation media experiences on the Web. Together with Akamai, we will take that a step further by offering a consistently superior adaptive streaming experience on a global scale.”
Akamai will be building upon this innovative technology with a new service, Akamai AdaptiveEdge Streaming for Microsoft Silverlight, which will be deployed across the company’s globally distributed network to bring a solution with HD scale to media companies worldwide. The service is expected to be available to select Akamai customers in a beta release in early 2009. Akamai AdaptiveEdge Streaming for Silverlight will leverage IIS Smooth Streaming, which offers a simple-to-manage approach for adaptive streaming, and will be an upcoming feature of IIS7 Media Pack. IIS7 Media Pack brings media-specific features such as bit-rate throttling and playlists to Web servers. This powerful solution is enhanced by the compelling experiences and rich interactive applications enabled by the Silverlight player.
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Comparing HD Video Quality: Microsoft Details SmoothHD Video Encoding Specs
With multiple online HD video offerings on the market today, comparing the "quality" from one format/solution to the other is difficult and will only get harder. Many of the HD solutions look really similar to one another and have large window sizes with great picture quality. To really compare the quality of the video, the encoding specs need to be compared so you can do as close of an apples to apples comparison as possible. With that in mind, Microsoft has provided me with details on what the encoding specs are for the HD content being shown at SmoothHD.com.
The majority of the content is encoded with these settings
- 320x176 @ 400 kbps
- 424x240 @ 650 kbps
- 640x352 @ 1100 kbps
- 848x480 @ 1500 kbps
- 1056x592 @ 2000 kbps
- 1280x720 @ 2500 kbps
The content from Turner, MLB and NASCAR, were encoded with a 20% higher bitrate due to content complexity:
- 320x176 @ 500 kbps
- 424x240 @ 800 kbps
- 640x352 @ 1300 kbps
- 848x480 @ 1800 kbps
- 1056x592 @ 2400 kbps
- 1280x720 @ 3000 kbps
All audio is 64 kbps stereo using WMA 10 Pro. Since dynamic bitrate switching is based on available client bandwidth and playback frame rate, the player is able to switch between bitrates as often as every 2 seconds if necessary. Microsoft also noted that Akamai will likely also add a higher quality NBA re-encode, at 3 Mbps peak, sometime in the next day or so. Thanks to Microsoft for the encoding specs, which many times, are very hard to get from content owners or those distributing the content.