---
name: "jack_rec"
section: "1"
platform: "linux"
package: "jack-example-tools"
version: "4-2"
release: "Arch Linux 2026-11-01"
platforms: ["linux"]
url: "https://new.carta.tech/jack_rec"
---

# jack\_rec(1)

JACK toolkit client for recording audio

## NAME

jack\_rec - JACK toolkit client for recording audio

## SYNOPSIS

**jack\_rec** -f filename -d seconds \[ -b bitdepth \] port1 \[ port2 ... \]

## DESCRIPTION

**jack\_rec is a basic, but useful, audio recorder that will record** audio from 1 or more JACK ports to a file on disk. The file format is always RIFF/WAV, with samples stored as signed integers. The sample bit depth can be selected using the *-b* option. The file will have as many channels as there are ports specified on the command line - each channel will contain the data recorded from one port. The user should generally specify the duration (in seconds) using the *-d* option. If not specified, jack\_rec will record until terminated by a signal (eg. from Ctrl-c).

This application is not intended to be a heavy duty audio recorder, and originated as an example client to show how to handle threading and disk I/O in a JACK client. However, it is a useful, simple recorder and is included in the JACK toolkit as a result.