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Chapter 13. Using Sound in Flash > Sound Compression

Sound Compression

As mentioned, sound is data intensive. To help you minimize file size, Flash offers two approaches to compression: You can either create individual compression settings for each sound or you can apply a global compression scheme. You’re generally much better off setting up compression for each sound individually than letting Flash use one overall compression scheme.

By default, Flash uses MP3 16-bit mono compression. You can change this default by specifying a different compression scheme in Publish Settings. Although MP3 compression does a terrific job with keeping file sizes small, it does have some limitations of which you should be aware. The higher frequency sounds tend to get lost during heavy compression. In fact, if you’ve been testing your movie by publishing it, you’ve probably noticed that the highhats sound is kind of muddy. That’s MP3 compression kicking in.


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