MACROMEDIA DIRECTOR MX-USING DIRECTOR MX, Руководство пользователя

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Chapter 12 326
Compressing internal sounds with Shockwave Audio
Shockwave Audio can compress any internal sounds in a movie. Although internal sounds are not
streamed, compressing them with Shockwave Audio dramatically decreases the size of the sound
data in a movie, shortens the download time from the Internet, and saves disk space.
You can use Shockwave Audio settings to specify compression settings for internal sound cast
members. The selected compression settings apply to all internal sound cast members. You cannot
specify different settings for different cast members.
You can select compression settings at any time, but compression occurs only when the Director
movie is compressed with the Create Projector, Save as Shockwave Movie, or Update Movies
commands. When you create a projector, Director compresses sounds only if the Compressed
option is turned on in the Projector Options dialog box. Compressing sounds can substantially
increase the time required to compress a Director movie. See “Creating projectors” on page 582.
Note: Shockwave Audio does not compress SWA or MP3 audio sounds.
When you distribute a movie that contains sounds compressed with Shockwave Audio, the
SWA Decompression Xtra is already included in the Shockwave player. If you compress sounds
in Shockwave format in a projector, you must provide the SWA Decompression Xtra for
the projector.
To have Director compress internal sound cast members when you create a projector, save a
movie as Shockwave, or update the movie:
1
Select File > Publish Settings.
2
Select the Compression tab.
3
Select Compression Enabled to turn on compression.
4
Select a setting from the kBits/second pop-up menu.
5
Select Convert Stereo to Mono if you want to convert a stereo file to monaural.
At rates lower than 48 Kbps, all sounds are converted to monaural.
6
Click OK.
Streaming linked Shockwave Audio and MP3 audio files
Director streams sounds that have been compressed with Shockwave Audio as well as MP3 audio
files, from either a local disk or a URL. Before you can set up a streaming Shockwave Audio cast
member, you must create a Shockwave Audio or MP3 file.
To create external Shockwave Audio files, do one of the following:
•
In Windows, select Xtras > Convert WAV to SWA, and select the WAV files to convert.
•
On the Macintosh, use the Peak LE 2 software to export Shockwave Audio sounds.
For both methods, the audio settings are similar to those for using Shockwave Audio to compress
internal sounds. See “Compressing internal sounds with Shockwave Audio” on page 326.
Note: Converting WAV to SWA does not compress IMA compressed sounds.