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发信人: Name (冷雨无晴), 信区: Multimedia
标题: Creating Rich Media with QuickTime, Part II
发信站: 荔园晨风BBS站 (Tue May 29 22:11:47 2001), 转信

Creating Rich Media with QuickTime, Part II

By Barb Roeder

整理/搜新网吴朝相

Creating an HREF Track

HREF tracks are specialized text tracks containing URLs to other pages
and sites as well. In this case, however, the text is not normally
viewed; rather, it is used to synchronize your movie with other media at
your site. For example, an online catalog might have a movie with
product demonstrations, and for each segment a different frame, with
product information displayed on the same Web page. In an HREF track,
the text information can be updated without recreating the movie.

HREF tracks can be clickable or autoloading. Figure 4 illustrates both
methods in one text descriptor file, which was created using the
following steps.

Figure 4: A Text Descriptor File for an HREF Track

1. Start with a list of URLs in a plain text file and use the steps
outlined above to create a basic text track movie.

2. After exporting the text descriptor file, you can open it up in
your word processing application. Then, open the movie file and its
information window in MoviePlayer, using the Get Info command in the
Movie pull down menu. Your display should look like Figure 5.

Figure 5: Setting Time Stamps for the Text Track in a QT Movie

Tip: Click on the button with four dots in MoviePlayer to reveal the
playback controls that will help you scrub through your movie and find
time codes. Move the black diamond in the MoviePlayer controller to
the general point of the segment begin or end time, then use the
middle set of keys on the controller (hi-lighted in gold in Figure 5),
to step through single frames for complete accuracy.

3. The times listed in the text descriptor file shown in Figure 5 are
the default two-second segments that QT assigns to each line of text (in
this case, each URL). Choose the movie segments where you want these
links to be active, then use the times listed in the Movie/Time
information window under Current Time, to modify the time stamps in
the text descriptor file. Always end the text descriptor file with a
time stamp of the ending movie time, as listed in the Movie/Time
Duration information block.

Tip: A blank line, such as the one between the first two time stamps
of the text descriptor file in Figure 5, can be used to deactivate the
links as the movie progresses.

4. Edit the new text descriptor file using the syntax shown in Figure 4.
After the second time stamp in the text descriptor file, an automatic
link is created by proceeding the URL with the A tag. The page for
Product 1 then loads into the frame as specified by the T tag and
remains there for 40 seconds. A second page then loads into the same
frame for the next 40 seconds of the movie. The frame is thereby updated
with a new page called . And finally, by preceding the URL without
the A tag, a clickable HREF is created at the end of the movie, which
allows the user to open up another movie if they so desire. The
destination means the movie opens in the QT player or the plug-in,
depending on which is being used for playback.

Tip: Make your URL segments at least 1/2 a second long so they won't
be skipped if QT has to drop some frames to keep up during playback on
slower computers and/or connections.

5. Save the text descriptor file and import it into the player
application.

6. Add the text movie back into your movie file using the Add Scaled
command. Make sure the cursor is at the beginning of the movie file.
Hold down the Shift-Ctrl-Alt keys (on Windows) or Shift-Option keys
(on Mac) and pull down the Edit menu. The Paste command should be listed
as Add Scaled.

7. Assign the text track to be an HREF track in the information window
shown in Figure 6. When you click on the Change Name button in the
General panel, the Change Track Name dialog box appears. Using the exact
same format as shown in the figure, you name your text track HREFTrack.

Figure 6: Setting an HREF Track in QT

8. Disable the HREFTrack so the URL text is not displayed in the movie
frame using the Edit->Enable Tracks pop-up menu, then save the movie
without dependencies.

HREF tracks can be streamed, but it is a little tricky to time the
downloading of the HTML for synchronization with your movie. An
example of how to use the Sprite track feature of QT to accomplish
this will be discussed in the next section.

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