jack.record(1) JACK Capture Client


jack.record [options] sound-file


-b : Set the disk buffer size in frames (default=4096). This value must be a power of two. If the JACK period size at any time exceeds this value the recorder will halt.

-f : Set the file format (default=0x10006). The number is a bitwise-or of two values, the first describes the file type, the second the data type. The default value of 0x10000 | 0x00006 describes a thirty-two bit floating point WAV file.

-m : Set the minimal disk transfer size in frames (default=32). This is an optimization switch.

-n : Set the number of input channels to create (default=2).

-s : Capture to a set of single channel sound files. The sound file name must be a valid template.

-t : Set a timer to stop the recording after the specified number of seconds (default=-1).


jack.record is a light-weight JACK capture client to write an arbitrary number of channels to disk. It implements no connection logic, use jack.plumbing(1) instead.

If the default mode a single multiple channel sound file is written. If the -s option is given a set of single channel sound files are written. In this case the sound file name must be a valid template, the substring %d is replaced with the channel number counting from zero.

jack.record will write files in any format supported by libsndfile. The table below shows the most common file format masks. For other values see the file sndfile.h.

Format Code Description ------ ---- ----------- SF_FORMAT_WAV 0x10000 Microsoft WAV format SF_FORMAT_AIFF 0x20000 Apple/SGI AIFF format SF_FORMAT_PCM_16 0x00002 Signed 16 bit data SF_FORMAT_PCM_24 0x00003 Signed 24 bit data SF_FORMAT_PCM_32 0x00004 Signed 32 bit data SF_FORMAT_FLOAT 0x00006 32 bit float data


Rohan Drape http://slavepianos.org/rd/


Rohan Drape <[email protected]>