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A Practical Guide to Video and Audio Compression by Cliff Wootton

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7

Matters Concerning Audio

7.1 I Hear the Sound of Distant Drums—and Voices

Compressing video deals with the visual part of the movie, but what about the sound track? This chapter covers the audio standards and formats that are used most often with compressed video. There are two primary scenarios to consider. There are others, of course, but these represent the extremes:

•  Simple conversation with human voices as in telecoms or other low bit-rate projects.

•  Very-high-quality music, background ambiance, and movie-quality sound tracks.

Before we go any further with our journey to perfect compression, let’s divert from the straight and narrow path and spend a short while listening to the quiet rustle of pixels wafting gently in the breeze.

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