Ip Media Advantages And Disadvantages

854 Words4 Pages
Nowadays many people explore the possibilities for consuming multimedia over IP networks using Internet TV, IPTV or Mobile TV solutions. The majority of solutions on the market use real-time streaming. Real-time streaming-real-time-content delivery (live events viewed as they happen) and the ability to play content as soon as transmission is started are two advantages. First, Media protocols often have difficulty getting around firewalls and routers because they are commonly based on UDP sockets over unusual port numbers. HTTP-based media delivery has no such problems because firewalls and routers know to pass HTTP downloads through port 80. Second, HTTP media delivery has the ability to use standard HTTP servers and standard HTTP caches (or…show more content…
increased delay when bandwidth is insufficient for timely transmission of content. Multiple copies of the same content with different bit-rates, spatial/temporal resolutions and/or other encoding characteristics are provided. Each copy, also called a quality level, consists of a sequence of time-aligned chunks. A client can switch between quality levels at run-time on a chunk-by-chunk basis to react to varying network conditions. Due to its adaptive nature, this new class of protocols is called ‘adaptive streaming…show more content…
Formally, the main difference between the two is that Internet TV delivery is done over an unmanaged network whereas IPTV delivers content over a managed network. Internet TV content, in theory, is delivered without resource reservation and quality-of service (QoS) provisions. In reality, the vast majority of the currently deployed systems are based on content delivery networks (CDN), peer-to-peer (P2P) networks or a hybrid of the two. In these technologies, connections between the edge-servers and the end-users have no QoS provisions (‘last mile’ problem), thus making a way to the use of adaptive streaming protocols to adapt to changing network conditions. In contrast to Internet TV, IPTV has a controlled delivery environment, because it is managed by the service provider. Nevertheless, recent developments of IPTV solutions that extend to Mobile TV and home-network, facing a ‘last mile’ problem that is similar to the Internet TV case. For this reason, adaptive streaming protocols have been also considered for
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