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"Digital Media Primer" Yue-Ling Wong, Copyright (c)2013 by Pearson Education, Inc. All rights reserved.
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Chapter 5 Capturing and Editing Digital Audio
Part 4 Delivery of Digital Audio
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In this lecture, you will learn:
Delivery of audio for different intended uses
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Uses of Digital Audio Video Multimedia authoring Playback on the Web
Audio CD Podcast
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Video Export audio and import it into the video editing program
Most video editing program support: .wav .aif mp3 Some audio editing program, such as Adobe Audition, let you import video can synchronize audio with the video
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Multimedia Authoring Export audio and import it into the multimedia authoring program Adobe Flash supports: .wav .aif .au .mp3 audio-only QuickTime
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Playback on the Web Best if small file size for less wait time
HTML5 audio Streaming format Progressive download
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Methods to Play Back on the Web
Embedding the audio on the Web page HTML5 audio Played using the browser's built-in player Non-HTML5 audio Played using plug-in or external player Linking to the audio file will cause the file to play in an external player window
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HTML5 Audio Supported formats: MP3, ACC (MP4), OGG Vorbis, and WAV
HTML5 <audio> tag: Example usage: <audio src="demo.oga" controls> An introduction of HTML5 video and audio is covered in Chapter 15
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QuickTime Audio-Only Movies
Can be exported using video-editing programs (Adobe Premiere Pro, Apple Final Cut Pro) Fast-start movies: Allow progressive download—the audio will start to play as soon as enough data have been downloaded.
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Embedding QuickTime Audio-Only Movies in a Web Page
HTML <object> tag Parameters: controller: visibility of the movie controller bar loop: whether the movie loops playback autoplay: whether the movie automatically starts
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Example HTML Code: Embedding QuickTime for Background Music
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" " <html xmlns=" <head> <title>Demo – QT Sound with Controller</title> </head> <body> <object classid="clsid:02BF25D5-8C17-4B23-BC80-D3488ABDDC6B" codebase=" width="0" height="0"> <param name="src" value="ylwong-example.mov"/> <param name="controller" value="false"/> <param name="autoplay" value="true"/> <param name="loop" value="true"/> <embed width="0" height="0" src="ylwong-example.mov" controller="false" autoplay="true" loop="true" > </embed> </object> </body> </html> Please update the code in Figure 5.26 in the book
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Example HTML Code: Embedding QuickTime with a Controller Bar
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" " <html xmlns=" <head> <title>Demo – QT Sound with Controller</title> </head> <body> <object classid="clsid:02BF25D5-8C17-4B23-BC80-D3488ABDDC6B" codebase=" width="50" height="16"> <param name="src" value="ylwong-example.mov"/> <param name="controller" value="false"/> <param name="autoplay" value="true"/> <param name="loop" value="true"/> <embed width="50" height="16" src="ylwong-example.mov" controller="false" autoplay="true" loop="true" > </embed> </object> </body> </html>
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QuickTime with a Controller Bar
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RealAudio Can be streamed
require a Real Server—a streaming server Can also be used on the Web without streaming .ra or .rm file converted from a .wav using RealProducer Basic (free) or RealProducer Plus
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Audio CD Must use: sampling rate: 44,100 Hz bit depth: 16 stereo Audio editing programs (such as Adobe Audition) also let you create audio CD projects: title and artist for each track length of pauses between tracks enable/disable copy protection ISRC number
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Podcast Podcast: Episode: Each file in the podcast Feed:
a collection of files available on a Web server usually audio files can be any types of files: Web pages, text, PDF, images, ... Episode: Each file in the podcast Feed: The text file that lists the internet addresses of the files in a podcast. Posted on a Web server People subscribe to the feed
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How Podcast Works Whenever a new episode is available, it will be automatically downloaded to the subscriber's computer or device (e.g. iPod) The software program that periodically checks and download the new items is called aggregator (e.g. iTune)
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General Steps to Podcast Audio
Create Your Audio Content in MP3 Put Your MP3 Files on a Web Server Create Your Podcast Feed File an XML file that lists these information of each episode: title internet address author description length and type of the audio publication date Publish Your Podcast Feed Post your feed file to a Web server and make a link to the feed file like you would post and link any other content. Icons used for the link:
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Review Questions Note to instructor:
Depending on your preference, you may want to go over the review questions at the end of this lecture as an instant review or at the beginning of next lecture to refresh students' memory of this lecture.
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Review Question Name several uses of digital audio. Video
Multimedia authoring Playback on the Web Audio CD Podcast
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Review Question In which of the following uses of audio that the smaller file size is generally a more crucial consideration? Video Multimedia authoring Playback on the Web Audio CD Podcast C
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Review Question In which of the following uses of audio that the audio quality is generally a more crucial consideration? Video Multimedia authoring Playback on the Web Audio CD Podcast D
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Review Question What is the advantage of using streaming format or progressive download for audio playback on the Web? You do not have to wait until the whole audio file has been downloaded in order to start playing. As soon as enough information has been downloaded, the audio will start playing.
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Review Question Which of the following properties of a QuickTime audio-only movies can be set in the HTML code? (More than one correct choice) visibility of the controller bar width and height of the controller bar automatically start playing looping the audio all A, B, C and D
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