Multimedia over IP and Wireless Networks: Compression, by Mihaela van der Schaar, Philip A Chou

By Mihaela van der Schaar, Philip A Chou

Multimedia over IP and instant Networks is an fundamental consultant for pros or researchers operating in parts reminiscent of networking, communications, facts compression, multimedia processing, streaming architectures, and machine graphics.

Beginning with a concise review of the elemental ideas and demanding situations of multimedia conversation and networking, this publication then branches off organically to take on compression and networking subsequent ahead of relocating directly to platforms, instant multimedia and extra complex themes. The Compression part advises at the most sensible ability and technique to make sure multimedia sign (images, textual content, audio and knowledge) integrity for transmissions on instant and stressed platforms. The Networking part addresses channel safeguard and function. within the platforms part, the point of interest is on streaming media on call for, stay broadcast and video and voice's function in real-time verbal exchange. instant multimedia transmission and caliber of provider concerns are mentioned within the instant Multimedia section.

An complex subject matters part concludes the booklet with an collection of themes together with Peer-to-Peer multimedia conversation and multipath networks.

  • Up-to-date assurance of current criteria for multimedia networking
  • Synergistic instructional technique reinforces wisdom received in prior chapters
  • Balanced therapy of audio and video with insurance of end-to-end systems

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Additional info for Multimedia over IP and Wireless Networks: Compression, Networking, and Systems

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The later mode of operation, with a predefined data size of a slice, is especially useful from a network perspective, since the slice size can be better matched to the packet size supported by the network layer. In this case, a loss of a data unit on network layer will result in a loss of a discrete number of slices, and a considerable portion of a picture might remain unaffected by the loss. 264/AVC, slices are the basic output of the video encoder and form an independently accessible entity. Provision of access to those units is provided either by the use of unique synchronization markers or by the appropriate encapsulation in underlying transport protocols.

However, the trade-offs among reliability, delay, and bit rate have to be considered. Nevertheless, to compensate the shortcomings of non-QoS-controlled networks, for example, the Internet or some mobile systems, as well as to address total blackout periods caused, for example, by network buffer overflow or a handoff between transmission cells, error control features are introduced at the application layer. For example, broadcast services make use of application-layer FEC schemes. For point-to-point services, selective application layer retransmission schemes have been proposed.

In the simplest form, the decoder just skips the decoding operation and the display buffer is not updated, that is, the displayed frame is still sˆt−1 . The viewer will immediately recognize the loss of fluent motion since a continuous display update is not maintained. However, in addition to the display buffer, the reference frame buffer is also not updated as a result of this data loss. Even in case of successful reception of packet Pt+1 , the inter-coded frame sˆt+1 reconstructed at the decoder will in general not be identical to the reconstructed frame s˜t+1 at the encoder.

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