rec 命令

常用示例

说明

rec is the recording component of SoX (Sound eXchange), the Swiss Army knife of audio processing. It records audio from the default input device (microphone, line-in) to a file in various formats. The output format is typically determined by the file extension. SoX supports dozens of formats including WAV, MP3, FLAC, OGG, AIFF, and raw audio. Format-specific encoding options can be specified for compressed formats. SoX effects can be applied during recording, including silence detection to automatically stop recording, trimming to limit duration, and gain adjustments. Effects are specified after the output filename. rec is equivalent to sox -d (using the default input device) with appropriate defaults for recording. Similarly, play is a playback alias for sox.

参数

-r _rate_

Set sample rate in Hz (e.g., 44100, 48000)

-c _channels_

Set number of channels (1=mono, 2=stereo)

-b _bits_

Set sample size in bits (8, 16, 24, 32)

-t _type_

Specify file type (wav, mp3, flac, ogg, etc.)

-e _encoding_

Set encoding type (signed-integer, unsigned-integer, floating-point, a-law, u-law)

-C _factor_

Set compression factor for output format

-S

Show input format, processing progress, and peak-level meter (default for rec)

-q

Quiet mode; suppress progress output

-V_level_

Set verbosity (0=none, 1=errors, 2=warnings, 3=processing info)

-n

Use null file; useful with effects like stat for monitoring without recording

--norm=_dBLevel_

Guard against clipping and normalize audio

-G

Automatically prevent clipping by applying gain adjustment

trim _start_ _duration_

Record from start position for specified duration

silence

Stop recording based on silence detection

fade _type_ _in_ _stop_ _out_

Apply fade effects