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User manual APPLE HTTP LIVE STREAMING - OVERVIEW

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User guide APPLE HTTP LIVE STREAMING - OVERVIEW

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HTTP Live Streaming Overview 2009-09-09 Apple Inc. © 2009 Apple Inc. All rights reserved. No part of this publication may be reproduced, stored in a retrieval system, or transmitted, in any form or by any means, mechanical, electronic, photocopying, recording, or otherwise, without prior written permission of Apple Inc., with the following exceptions: Any person is hereby authorized to store documentation on a single computer for personal use only and to print copies of documentation for personal use provided that the documentation contains Apple's copyright notice. The Apple logo is a trademark of Apple Inc. Use of the "keyboard" Apple logo (Option-Shift-K) for commercial purposes without the prior written consent of Apple may constitute trademark infringement and unfair competition in violation of federal and state laws. No licenses, express or implied, are granted with respect to any of the technology described in this document. Apple retains all intellectual property rights associated with the technology described in this document. This document is intended to assist application developers to develop applications only for Apple-labeled computers. Every effort has been made to ensure that the information in this document is accurate. Apple is not responsible for typographical errors. Apple Inc. 1 Infinite Loop Cupertino, CA 95014 408-996-1010 Apple, the Apple logo, iPod, Leopard, Mac, QuickTime, Safari, and WebObjects are trademarks of Apple Inc., registered in the United States and other countries. iPhone and Snow Leopard are trademarks of Apple Inc. Intel and Intel Core are registered trademarks of Intel Corportation or its subsidiaries in the United States and other countries. Simultaneously published in the United States and Canada. Even though Apple has reviewed this document, APPLE MAKES NO WARRANTY OR REPRESENTATION, EITHER EXPRESS OR IMPLIED, WITH RESPECT TO THIS DOCUMENT, ITS QUALITY, ACCURACY, MERCHANTABILITY, OR FITNESS FOR A PARTICULAR PURPOSE. AS A RESULT, THIS DOCUMENT IS PROVIDED "AS IS," AND YOU, THE READER, ARE ASSUMING THE ENTIRE RISK AS TO ITS QUALITY AND ACCURACY. IN NO EVENT WILL APPLE BE LIABLE FOR DIRECT, INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES RESULTING FROM ANY DEFECT OR INACCURACY IN THIS DOCUMENT, even if advised of the possibility of such damages. THE WARRANTY AND REMEDIES SET FORTH ABOVE ARE EXCLUSIVE AND IN LIEU OF ALL OTHERS, ORAL OR WRITTEN, EXPRESS OR IMPLIED. No Apple dealer, agent, or employee is authorized to make any modification, extension, or addition to this warranty. Some states do not allow the exclusion or limitation of implied warranties or liability for incidental or consequential damages, so the above limitation or exclusion may not apply to you. This warranty gives you specific legal rights, and you may also have other rights which vary from state to state. Contents Introduction Introduction 7 Organization of This Document 7 See Also 7 Chapter 1 HTTP Streaming Architecture 9 Overview 9 Server Components 10 Media Encoder 11 Stream Segmenter 11 Media Segment Files 12 Distribution Components 12 Client Component 12 Chapter 2 Using HTTP Live Streaming 13 Session Types 13 Content Protection 13 Caching and Delivery Protocols 14 Stream Alternates 14 Failover Protection 15 Sample Streams 16 Chapter 3 Frequently Asked Questions 17 Document Revision History 21 3 2009-09-09 | © 2009 Apple Inc. All Rights Reserved. CONTENTS 4 2009-09-09 | © 2009 Apple Inc. All Rights Reserved. Figures Chapter 1 HTTP Streaming Architecture 9 Figure 1-1 A basic configuration 10 Chapter 2 Using HTTP Live Streaming 13 Figure 2-1 Stream alternates 15 5 2009-09-09 | © 2009 Apple Inc. All Rights Reserved. FIGURES 6 2009-09-09 | © 2009 Apple Inc. All Rights Reserved. INTRODUCTION Introduction HTTP Live Streaming allows you to send live or prerecorded audio and video to iPhone or other devices, such as desktop computers, using an ordinary Web server. Playback requires iPhone OS 3.0 or later on iPhone or iPod touch; QuickTime X or later is required on the desktop. Support is included for both encryption and authentication. The HTTP Live Streaming specification is an IETF Internet-Draft. If you are interested in streaming live events to iPhone, streaming live events without special server software, or in sending video on demand with encryption and authentication, you should read this document. Note: This document was formerly tltled "iPhone Streaming Media Guide for Web Developers." Organization of This Document This document contains three chapters: "HTTP Streaming Architecture" (page 9)--how the technology works, what formats are supported, what you need on the server, and what clients are available. "Using HTTP Live Streaming" (page 13)--how to set up live broadcast or video on demand sessions, how to implement encryption and authentication, and how to set up alternate bandwidth streams. Links to sample streams are included. "Frequently Asked Questions" (page 17)--common questions about HTTP Live Streaming, and their answers: format details, tips, where to go for support, and so on. See Also Safari Web Content Guide--how to design web content for iPhone. HTTP Live Streaming protocol--the IETF Internet-Draft of the HTTP Live Streaming specification. Organization of This Document 2009-09-09 | © 2009 Apple Inc. All Rights Reserved. 7 INTRODUCTION Introduction 8 See Also 2009-09-09 | © 2009 Apple Inc. All Rights Reserved. CHAPTER 1 HTTP Streaming Architecture Starting with iPhone OS version 3.0 and QuickTime X, you can send streaming audio and video over HTTP from an ordinary web server for playback on iPhone, iPod touch, or other devices, such as desktop computers. This is called HTTP Live Streaming. Because it uses HTTP, this kind of streaming is automatically supported by nearly all edge servers, media distributors, caching systems, routers, and firewalls. HTTP Live Streaming also provides for media encryption and user authentication over HTTPS, allowing publishers to protect their work. Note: Many existing streaming services require specialized servers to distribute content to end users. These servers require specialized skills to set up and maintain, and in a large-scale deployment this can be costly. HTTP Live Streaming avoids this by using standard HTTP to deliver the media. Additionally, HTTP Live Streaming is designed to work seamlessly in conjunction with media distribution networks for large scale operations. Overview Conceptually, HTTP Live Streaming consists of three parts: the server component, the distribution component, and the client software. The server component is responsible for taking input streams of media and encoding them digitally, encapsulating them in a format suitable for delivery, and preparing the encapsulated media for distribution. The distribution component consists of standard web servers. They are responsible for accepting client requests and delivering prepared media and associated resources to the client. For large-scale distribution, edge networks or other content delivery networks can also be used. The client software is responsible for determining the appropriate media to request, downloading those resources, and then reassembling them so that the media can be presented to the user in a continuous stream. iPhone includes built-in client software: the media player, which is automatically launched when Safari encounters an or
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