sox

Convert audio format

$ sox [input.wav] [output.mp3]

$ sox [file1.wav] [file2.wav] [output.wav]

$ sox [input.wav] -r [44100] [output.wav]

$ sox [input.wav] [output.wav] channels 1

$ sox [input.wav] [output.wav] reverb

$ sox [input.wav] [output.wav] trim [0] [10]

$ sox [input.wav] [output.wav] norm

$ sox -d [output.wav]

sox [options] infiles outfile [effects...]

sox (Sound eXchange) is a command-line audio processing tool. It converts between formats, applies effects, and can record and play audio.
The tool supports many audio formats and provides extensive processing capabilities including filtering, mixing, and format conversion.

-r rate

Sample rate.

Number of channels.

Sample size in bits.

Sample encoding.

File type.

Volume adjustment.

Default audio device.

Combine method (concatenate, merge, mix).

trim: Cut portion
fade: Fade in/out
reverb: Add reverb
norm: Normalize
speed: Change speed
pitch: Shift pitch
equalizer: EQ adjustment
compand: Compression

Some formats need external libraries. Complex effects chains can be slow. Quality depends on parameters. Some effects modify duration.

SoX was started by Lance Norskog in 1991 and has been developed by many contributors. It became the Swiss Army knife of audio processing on Unix systems.

ffmpeg(1), lame(1), flac(1), aplay(1)