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Lesson 5. Using Sound > Modifying Sound Compression

Modifying Sound Compression

Flash 5 lets you export sound in three formats: ADPCM, MP3, and Raw. If you are using Windows, Flash can also export sounds in WAV format. By setting the export properties for each sound individually, you can control the quality of each sound file by choosing how small (compressed) to make the file. The files that need to be clearest can be compressed less so that they are truer to the original file. Experiment with these settings to balance the overall file size with sound quality.

1.
Open the library for neptune24.fla, and locate the loop.mp3 sound. Right+click (Windows) or Control-click (Macintosh) the sound, and choose Properties from the contextual menu to open the Sound Properties dialog box.

You can set compression settings for each sound individually in this dialog box.

2.
From the Compression pop-up menu, choose MP3.

You have several choices for this setting.

ADPCM sets compression for 8-bit or 16-bit sound data. Use ADPCM when you are exporting short event sounds, such as button sounds. A setting of 22 kHz is standard for Web publishing and half the standard CD publishing rate of 44 kHz.

MP3 exports sounds with MP3 compression. Use MP3 when you are exporting longer and streamed sounds, such as music soundtracks. Change the Bit Rate and Quality settings, and notice how the sound file size is reduced or increased. Choose a bit rate higher than 16 Kbps for better sound quality.

Raw exports sounds with no sound compression. A setting of 22 kHz is standard for Web publishing and half the standard CD publishing rate of 44 kHz.

3.
Set the bit-rate to 32 Kpbs and the quality to Fast.

A higher bit-rate results in a higher-quality sound with less compression. The quality setting affects the speed at which the sound is compressed. Fast yields the fastest compression with lower sound quality. Medium yields slower compression with higher sound quality. Best yields the slowest compression with the highest sound quality.

TIP

When you are exporting music, set the bit-rate to 16 Kbps or higher for the best result.

4.
Click the Test button.

The sound should play, using the compression settings you specified. You can see how the compression settings affect the size of the sound at the bottom of the window. Play around with the compression settings until you get a sound quality that works for you.

5.
Click OK, and save your movie as neptune25.fla in the MyWork folder.

That's it for sound right now. You'll learn how to make a volume control in Lesson 9, and you'll learn more about compressing sound in Lesson 12.


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