RTP: Audio and Video for the Internet (paperback): Audio and Video for the Internet (Anglais) Broché – 11 juin 2003
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The Real-time Transport Protocol (RTP) provides a framework for delivery of audio and video across IP networks with unprecedented quality and reliability. In RTP: Audio and Video for the Internet, Colin Perkins, a leader of the RTP standardization process in the IETF, offers readers detailed technical guidance for designing, implementing, and managing any RTP-based system.
By bringing together crucial information that was previously scattered or difficult to find, Perkins has created an incredible resource that enables professionals to leverage RTP's benefits in a wide range of Voice-over IP (VoIP) and streaming media applications. He demonstrates how RTP supports audio/video transmission in IP networks, and shares strategies for maximizing performance, robustness, security, and privacy.
Comprehensive, exceptionally clear, and replete with examples, this book is the definitive RTP reference for every audio/video application designer, developer, researcher, and administrator.
Key coverage includes:
Biographie de l'auteur
Colin Perkins is a research assistant professor at the University of Southern California Information Sciences Institute, where his research interests include scaling Internet multimedia conferencing to support very large distributed meetings and to very high quality. From 1996 to 2000, he was a research fellow with the Department of Computer Science, University College, London, where he conducted research into advanced VoIP and IP-based videoconferencing technologies, and developed one of the earliest RTP teleconferencing implementations. He is co-chair of the Audio/Video Transport and Multiparty Multimedia Session Control working groups of the IETF, and has authored several RFC standards relating to RTP. He holds a Ph.D. in electronic engineering from the University of York.
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If I lost this book, I'd buy another one!
As you might expect, much of the text concerns the packet formats used in RTP. There are subsidiary protocols within RTP, like its control protocol. Naturally, these are explained, as they are a necessary part of the overall RTP.
Some chapters delve into specific timing issues. One, called lip synchronisation, refers to the difficulty of synchronising the audio and video portions of a video signal. Other chapters discuss how to conceal lost video packets. Error concealment is a very practical necessity in this field.
For those readers interested in RTP performance issues, some of the topics of interest that are not discussed effectively in the book include:
- Case studies of the affect of RTCP packets on network congestion. For example, studies on the dependence of network congestion (if any) on the reporting interval. The author makes the statement to the effect that an incorrect implementation of RTCP will result in a linear dependence on the number of users and cause "significant" network congestion. This assertion needs justification either through modeling or actual testing.
- Along these same lines, more discussion on how step joining can congest the network and how updating the number of senders can alleviate this congestion.
- The possibility that RTCP may act as a competing risk to some admission-control implementations. In particular, the feedback obtained by receiver reports allowing senders to adapt their transmissions is very similar to what is done using measurement-based policy-based admission control (MBAC).
- In-depth discussion on the optimal round-trip time for interactive applications.
- Case studies illustrating the difficulties in generating compound RTCP packets when there are more than 31 active senders.
- Examples or case studies showing how a poor choice of hash function for obtaining the synchronization source identifier (SSRC) can lead to "unbalanced and inefficient operation."
- The effect on congestion (if any) of the overhead of marked packets for informing receivers when to perform join experiments in multicast congestion control.
In spite of these shortcomings, there are a lot of interesting discussions in this book, such as the use of white noise and pattern-matching to conceal audio losses, the Rate Adaptation Protocol (RAP), and the use of layered coding for congestion control in multicast. Readers who need more details can consult the references given at the end of the book.
Note: This review is based on a reading of chapters 1-11 of the book.
Publication Date: April 1, 2012 | ISBN-10: 0321833627 | ISBN-13: 978-0321833624 | Edition: 1
the true date was in 2004 not 2012