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发信人: Name (冷雨无晴), 信区: Multimedia
标题: Creating Rich Media with QuickTime, Part I
发信站: 荔园晨风BBS站 (Tue May 29 22:11:10 2001), 转信

Creating Rich Media with QuickTime, Part I

By Barb Roeder

整理/搜新网吴朝相

Apple's QuickTime (QT) architecture has been the backbone of countless
multimedia projects and is the underlying architecture for many media
authoring tools. As a streaming media provider, delivering QT can land
you some really interesting projects. And as a video producer or Web
designer, your creativity will be sparked by the rich features of this
streaming media format. Need a business plan? How about interactive,
hyperlinked video streams for a product catalog? If your business is
streaming media, you need to take a look at what QT can do for you.

In order to get started authoring in QT, you will need the
professional version of the player, available for $29.95 on Apple's site
store. In this article, we'll focus on powerful features that can be
implemented easily using basic QT tools found in the player. At the
end of the article, you'll find references to more advanced QT
applications and links to some really cool content created using these
QT features.

QT is unique in that you can combine elements for true streaming and
progressive download in one file. In the next few sections, we'll
discuss several key features of QT and how they can best be applied to
progressive download or true streaming media.

Building Text and URLs into QT Movies

One of the most under-utilized components of QT is the text track, but
usage of this feature will gain momentum as Web developers realize its
benefits. You can set up a long movie with Chapter points, a useful
technique for organizing a distance-learning course. You can also put
a URL in the text track, hide it and then have a separate frame pop-up
with more information based on the content of your movie. Once you see
how easy it is to build text tracks into your movies, your creativity
will open up new ways to add interactivity and interest to your
streaming media.

Creating a Basic Text Track Movie

1. Using SimpleText on the Mac, or Wordpad on Windows, create a list
of text descriptions for the interactive points in your movie. Items
need to be separated by a carriage return.

2. Import that text file into your QT Pro player application using the
File menu command. QT will bring up an Open dialog box, and when you hit
the Convert button, it will be replaced by a Save converted file as,
dialog box.

3. If you click on the Options button, you can set the formatting
options for your text in the text description dialog box as shown in
Figure 1. These can also be modified later.

Figure 1: Formatting Options for QT Text Tracks

Formatting Tip 1: Anti-aliased text generally looks better, but takes up
CPU cycles when played. On the other hand, anti-aliased text scales
better, so if you think your viewers will be enlarging the movie window,
you'll want to check this option as well as the Auto-Scale feature.

Formatting Tip 2: If you are looking for a basic titling feature, you
might want to select the Drop Shadow effect and/or the Keyed Text
checkbox. Keyed text will be displayed with a transparent background, so
it can be overlayed with your video image.

4. When you enter a file name in the Convert dialog and hit OK, QT
creates the Text Movie from your text file, with each line of text in
a separate, two-second movie segment.

5. Using the Export command under the File pull-down, you will create
a text descriptor file for your text track. Select the Text to Text
options in the Export pull-down at the bottom of the Export dialog.
Then, when you click on the Options button, the Text Export Setting
dialog comes up as shown in Figure 2. Here you need to select the Show
Text, Descriptors and Time radio button and choose how you want the time
stamps to be interpreted. Choose 30 in the "Show fractions of seconds
as:" pull-down so it's easier to translate the time code of the movie
into the time stamps for the text track.

Figure 2: Text Export Settings in QT

6. Click OK, choose a name for your text descriptor file and save this
new text file for editing. Figure 3 shows the text movie and its
associated text descriptor file.

Figure 3: A Sample Text Movie and its Associated Text Descriptor File

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