1. © 2016 Pearson Education, Inc., Hoboken, NJ. All rights reserved.
"Digital Media Primer" Yue-Ling Wong, Copyright (c)2016 by Pearson Education, Inc. All rights reserved.
© 2016 Pearson Education, Inc., Hoboken, NJ. All rights reserved.

2. Chapter 5 Capturing and Editing Digital Audio
Part 5
Delivery of Digital Audio
© 2016 Pearson Education, Inc., Hoboken, NJ. All rights reserved.

3. In this lecture, you will learn:
Delivery of audio for different intended uses
© 2016 Pearson Education, Inc., Hoboken, NJ. All rights reserved.

4. © 2016 Pearson Education, Inc., Hoboken, NJ. All rights reserved.
Uses of Digital Audio
Video
Multimedia authoring
Playback on the Web
Audio CD
Podcast
© 2016 Pearson Education, Inc., Hoboken, NJ. All rights reserved.

5. © 2016 Pearson Education, Inc., Hoboken, NJ. All rights reserved.
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
© 2016 Pearson Education, Inc., Hoboken, NJ. All rights reserved.

6. © 2016 Pearson Education, Inc., Hoboken, NJ. All rights reserved.
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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7. © 2016 Pearson Education, Inc., Hoboken, NJ. All rights reserved.
Playback on the Web
Best if small file size for less wait time
HTML5 audio
Streaming format
Progressive download
© 2016 Pearson Education, Inc., Hoboken, NJ. All rights reserved.

8. 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
© 2016 Pearson Education, Inc., Hoboken, NJ. All rights reserved.

9. © 2016 Pearson Education, Inc., Hoboken, NJ. All rights reserved.
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
© 2016 Pearson Education, Inc., Hoboken, NJ. All rights reserved.

10. 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.
© 2016 Pearson Education, Inc., Hoboken, NJ. All rights reserved.

11. © 2016 Pearson Education, Inc., Hoboken, NJ. All rights reserved.
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
© 2016 Pearson Education, Inc., Hoboken, NJ. All rights reserved.

12. © 2016 Pearson Education, Inc., Hoboken, NJ. All rights reserved.
Podcast
Podcast:
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
© 2016 Pearson Education, Inc., Hoboken, NJ. All rights reserved.

13. © 2016 Pearson Education, Inc., Hoboken, NJ. All rights reserved.
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)
© 2016 Pearson Education, Inc., Hoboken, NJ. All rights reserved.

14. 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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15. © 2016 Pearson Education, Inc., Hoboken, NJ. All rights reserved.
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.
© 2016 Pearson Education, Inc., Hoboken, NJ. All rights reserved.

16. © 2016 Pearson Education, Inc., Hoboken, NJ. All rights reserved.
Review Question
Name several uses of digital audio.
Video
Multimedia authoring
Playback on the Web
Audio CD
Podcast
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17. © 2016 Pearson Education, Inc., Hoboken, NJ. All rights reserved.
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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18. © 2016 Pearson Education, Inc., Hoboken, NJ. All rights reserved.
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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19. © 2016 Pearson Education, Inc., Hoboken, NJ. All rights reserved.
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.
© 2016 Pearson Education, Inc., Hoboken, NJ. All rights reserved.