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itself, in isolation from and in parallel with the broadcast networks, then over the very long term the options available to the broadcaster become stark: comply or die. As the ISMA claims, adoption of a standard such as MPEG-4 can help to accelerate the uptake of streaming media delivered over the Internet, but not everybody is pleased to see the MPEG-4 standard. In the first place, production houses and broadcasters who have recently upgraded to MPEG2 digital production have a vested interest in not making their equipment obsolete (even though MPEG-2 data and tools are usable in MPEG-4). Also, MPEG-4 provides a new level of complexity to content authors and there are as yet few tools to support MPEG-4 content production. In addition, strong streaming media system vendors have invested much time and money in their own proprietary solutions, which in some respects outperform the standard MPEG-4 system. The sheer weight of numbers of the proprietary players that have already been installed may make it hard for MPEG-4 players to establish dominance, even though downloading new player software does not present all that onerous an obstacle to most users. Time will tell if the pressure to standardize outweighs the vested interests to stay with proprietary or semi-proprietary systems. MPEG-4 was designed to be used on television broadcast carriers as well as the Internet (or a mix of both). If MPEG-4 content eventually finds its way onto the digital television broadcast networks, the television will have to be a computer with considerable power, since the standard leaves lots of computational work to the client application. Even though DTV delivers great quality of service today and even though DVB-delivered AVOs can be freely mixed with Internet-delivered AVOs, the broadcast nature of digital television limits the choice of programs to just the few carried by the system. IP delivery of all AVOs over a broadband network will provide an almost limitless choice of on-demand programming. Even where multicast IP delivery is chosen, to minimize bandwidth costs, the choice of multicast IP channels is likely to exceed the offerings of even the most well-provisioned digital television system. Therefore, if broadband networks begin to offer quality of service at a cost comparable to that in digital television networks, IP delivery is likely to displace MPEG-4 delivered via MPEG-2 transport streams.
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Content delivery networks (CDNs) are schemes devised by companies to get streaming media content, in particular, to consumers, with a better
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quality of service than from the raw public Internet. The public Internet is prone to outages, congestion, queues, uncontrolled cascaded router hops, denial of service attacks, flash-floods of people requesting content from a particular siten and other behavior that can prevent a media stream from continuing to stream. Content delivery networks exist to get around these problems. Paying customers use CDN providers to transport their data from origin to the edge of the network, whether that edge is within their enterprise or serving the general public. There are three significant approaches adopted by content delivery networks:
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Pick the best route through the public Internet Go around the public Internet entirely, using a dedicated network Use periods of relative inactivity on the Internet opportunistically to move content to servers located physically closer to the consumer (in terms of both geographical and network proximity)
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All these approaches make use of edge caches (explained later in this chapter) to serve content transparently from a proxy located closer to the end-user than the origin server. The end-user logs on to the origin server, but the stream is actually delivered from a local proxy, with the end-user none the wiser. Edge caching is done to improve the quality of playback, since with fewer network segments between the end-user and the stream source, there is less likelihood of network congestion, packet loss, and traffic queues. The other benefit is that once the content has been moved to the edge, multiple end-users can access that content in a locale using much less expensive bandwidth than if a connection to the origin server had been opened for each player. It costs less to serve a stream from a server located in your city than from a server located in another country. Local calls are cheaper than long distance ones. In the first content delivery scheme mentioned, content is delivered across the public Internet, but a map of network congestion is maintained in real time, allowing the content requested to be routed from the origin server to the requesting consumer, avoiding congested network segments and unnecessary router hops. This is, in essence, the approach adopted by Akamai. The scale of the machinery needed to maintain a real-time map of activity on the entire Internet is monumental, to say the least. However, such a map is necessary if streams are going to be delivered by avoiding all network roadblocks as they occur. In addition, traffic routing optimization algorithms reflect a sublime understanding of the
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