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To summarize, then, a streaming media server has multiple delivery options. The four supported by the Windows Media Server are UDP, TCP, HTTP TCP, and Multicast. UDP provides the most efficient network throughput and can have a positive impact on player performance. However, administrators normally close their firewalls to UDP traffic, so UDP transport is problematic on the public Internet. TCP provides adequate support for delivering streaming media, but suffers from all the same problems that a regular Web server does. TCP traffic normally permeates firewalls. Microsoft implemented its own version of HTTP to enable streaming through firewalls and proxy servers, while retaining the advantages of a media server. This allows users to fast-forward and rewind, but adds some overhead to the raw TCP stream that decreases scalability. Finally, there is IP Multicast, which allows very efficient delivery of streaming content to large numbers of users, in much the same way as television broadcasts do. Multicast is finding a home on corporate networks, but is still very rare on the public Internet. The Windows Media Server will automatically switch to the appropriate protocol so that no client-side configuration is necessary. The server will initially attempt to transmit files using the optimal UDP or multicast protocols. If this does not work, the server will then attempt to send first via the raw TCP protocol, then via TCP with HTTP-based control. Windows Media Server also supports the legacy MMS, Microsoft s proprietary Microsoft Media Streaming protocol, a derivative of the Real Time Protocol (RTP). Although still included, it is considered obsolete and is not recommended for new installations. Media servers like Windows Media Server can support live and on-demand programming, using unicast or multicast protocols. Common scenarios include live ad insertion and Web radio, using server-side playlists. Microsoft s Windows Media Server also includes a technology called Intelligent Streaming. This combines multidata rate encoding, intelligent transmission, and a video playback filter to detect network conditions and adjust the properties of the video stream automatically to maximize playback quality. In the public Internet, connection speeds can vary by 50% or more of the maximum, depending on network and ISP (Internet Service Provider) congestion. Because Windows Media Technologies is a connected, end-to-end client/server system, the server and the client communicate with each other to establish actual network throughput and make a series of adjustments to maximize the quality of the stream. Intelligent Streaming maximizes use of the available bandwidth. Users receive content tailored to connection speed. This greatly improves user experience. Modem-connected users immediately notice the presentation is smoother, less jerky, and generally of higher quality.
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Intelligent Streaming works by automatically adjusting between multiple video bit rates and by cleaning up the video streams. Buffering is the biggest problem with streaming digital media. If the bandwidth available between server and client drops below the data rate of the stream, the player will always run out of material and have to rebuffer. Just because the connection speed is fast, does not mean that the bandwidth supports the bit rate. On the public Internet, unpredictability of bandwidth is taken as a given. Actual bandwidth available is determined by network conditions. Traffic on the Internet is constantly fluctuating. If a user attempts to view video streamed at one bit rate, but the bandwidth available often plunges below that, presentation continuity will be badly and obviously affected. Intelligent Streaming solves this by sending a stream with the appropriate bandwidth when the user first connects, then by dynamically and seamlessly adjusting the bit rate as network conditions change. The first technique used in Intelligent Streaming is Multi Data Rate Encoding. Windows Media Technology supports a technology equivalent to RealNetwork s SureStream, which allows graceful playback degradation as the bandwidth available on the streaming link degrades. Called Multi Bit Rate Encoding, it encodes up to ten discrete, user-definable video streams and one audio stream into a single Windows Media stream. The video streams are encoded from the same content, but each is encoded for a different bit rate. When a multiple-bit rate Windows Media file or live stream is played on Windows Media Player, connected to Windows Media Server, only one of the video streams is received: the one that is appropriate for the current bandwidth conditions. The process of selecting the appropriate stream is invisible to the user. The second technique of Intelligent Streaming is Intelligent Bandwidth Control. There are a number of steps in the process. Each is a strategy to modify the bit rate so that the stream remains continuous on the client, regardless of the bandwidths currently available. As bandwidth fluctuates between server and client, the server detects changes and adopts the best strategy. When bandwidth is at its best, the server employs the first strategy. As conditions worsen, the server checks its list of options one by one until the bit rate is optimized for the current available bandwidth. The strategies are as follows: in the first place, the server and client automatically determine the available bandwidth, then the server selects and serves the video stream at the appropriate rate. If the available bandwidth decreases during transmission, the server automatically detects the change and switches to a lower bandwidth stream. If the bandwidth improves, the server selects a higher bandwidth
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