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Chapter 8. Playing, Serving, and Streaming MP3

Contents:

MP3 pros and cons
What is MP3?
Playing MP3 files
Making MP3 files
Creating a buzz: posting MP3 files to the Internet
Start your own MP3 radio station
Legalities of MP3
MP3 resources
Summary

The MP3 revolution will not be televised. The MP3 revolution will not be sold in stores. The MP3 revolution will, however, be available online.

Whether MP3 is in fact a revolution remains to be seen. But it is no less than a grassroots phenomenon that is changing the way people listen to music, the way musicians build audiences, and the way record companies and promoters do business. So what is so exciting about MP3? Simple: the MP3 format provides relatively good audio quality in small file sizes, which means that music can be transmitted more easily over the Internet, and people can build file-based music collections without overstuffing their hard drives. It also means that artists have a new way to reach audiences without having to rely on the recording industry.

The MP3 format allows the person doing the encoding to establish his or her own quality-to-file-size ratio, so files can be very small with low fidelity, or comparatively large with high fidelity, or anywhere in between. These ratios usually are established by adjusting the sampling frequency and the number of bits per second (the bitrate) devoted to storing audio data. The de facto standard is considered 128 kilobits per second (Kbps), 44.1 kilohertz (kHz). At this quality level, a four-minute MP3 file weighs in at roughly 3.5 MB and sounds nearly as good as a compact disc. The same track in uncompressed WAV or AIFF format would be a whopping 40 MB. MP3 encoding can reduce the size of uncompressed audio by a factor of 10 or more while still retaining audio fidelity that approaches CD quality.

8.1. MP3 pros and cons

Naturally, there are both pros and cons to the MP3 format. Although it has garnered a huge following, the format does have disadvantages that should be considered by anyone preparing to test the waters of MP3 audio.

8.1.1. Advantages

  • Relatively high fidelity

  • Easy, inexpensive (generally free) encoding

  • Simple distribution, via HTTP and FTP protocols, and via CD or other portable storage media

  • Streaming implementation via server additions

  • Availability of sample source code, which creates potential for lots of competition, players, and encoders for all platforms

8.1.2. Disadvantages

  • Relatively large downloads for analog modem users

  • Decoding device (MP3 player) required (though Windows and BeOS come with native MP3 codecs and players, and most Mac users have QuickTime, which can also handle MP3)

  • Few security options available (although changes in this area are expected)

  • Some downloaded files are of poor quality; poorly encoded files often exhibit a slight "hollowness" or "swishiness" and may contain skips or glitches



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