/usr/bin/jackd --help — Chainguard OS Manuals

From jack 1.9.22-r8 (os), captured 2026-11-05 by running jackd --help (exit 0). permalink

jackdmp 1.9.22
Copyright 2001-2005 Paul Davis and others.
Copyright 2004-2016 Grame.
Copyright 2016-2023 Filipe Coelho.
jackdmp comes with ABSOLUTELY NO WARRANTY
This is free software, and you are welcome to redistribute it
under certain conditions; see the file COPYING for details

Usage: jackdmp [ --no-realtime OR -r ]
               [ --realtime OR -R [ --realtime-priority OR -P priority ] ]
      (the two previous arguments are mutually exclusive. The default is --realtime)
               [ --name OR -n server-name ]
               [ --timeout OR -t client-timeout-in-msecs ]
               [ --loopback OR -L loopback-port-number ]
               [ --port-max OR -p maximum-number-of-ports]
               [ --slave-backend OR -X slave-backend-name ]
               [ --internal-client OR -I internal-client-name ]
               [ --internal-session-file OR -C internal-session-file ]
               [ --verbose OR -v ]
               [ --clocksource OR -c [ h(pet) | s(ystem) ]
               [ --autoconnect OR -a <modechar>]
                 where <modechar> is one of:
                   ' ' - Don't restrict self connect requests (default)
                   'E' - Fail self connect requests to external ports only
                   'e' - Ignore self connect requests to external ports only
                   'A' - Fail all self connect requests
                   'a' - Ignore all self connect requests
               [ --replace-registry ]
               [ --silent OR -s ]
               [ --sync OR -S ]
               [ --temporary OR -T ]
               [ --version OR -V ]
         -d master-backend-name [ ... master-backend args ... ]
       jackdmp -d master-backend-name --help
             to display options for each master backend

Available backends:
      proxy (master)
      netone (master)
      net (master)
      loopback (slave)
      dummy (master)
      alsarawmidi (slave)
      alsa (master)

Available internals:
      profiler
      netmanager
      netadapter
      audioadapter

Options (38)

Option	Description	Source
`-h, --help`	Print a brief usage message describing the main jackd options.	man
`-a, --autoconnect` modechar	Select how to handle self connect requests.	man
`-m, --no-mlock`	Do not attempt to lock memory, even if --realtime.	man
`-n, --name` server-name	Name this jackd instance server-name.	man
`-p, --port-max` n	Set the maximum number of ports the JACK server can manage.	man
`--replace-registry`	Remove the shared memory registry used by all JACK server instances before startup.	man
`-R, --realtime`	Use realtime scheduling.	man
`-r, --no-realtime`	Do not use realtime scheduling.	man
`-P, --realtime-priority` int	When running --realtime, set the scheduler priority to int.	man
`--silent`	Silence any output during operation.	man
`-T, --temporary`	Exit once all clients have closed their connections.	man
`-t, --timeout` int	Set client timeout limit in milliseconds.	man
`-Z, --nozombies`	Prevent JACK from ever kicking out clients because they were too slow.	man
`-C, --internal-session-file` internal-session-file	Load internal clients and connections from internal-session-file.	man
`-u, --unlock`	Unlock libraries GTK+, QT, FLTK, Wine.	man
`-v, --verbose`	Give verbose output.	man
`-c, --clocksource` (	Select a specific wall clock (HPET timer, System timer).	man
`-V, --version`	Print the current JACK version number and exit.	man
`-d, --device` name	The ALSA pcm device name to use.	man
`-D, --duplex`	Provide both capture and playback ports.	man
`-M, --hwmeter`	Enable hardware metering for devices that support it.	man
`-H, --hwmon`	Enable hardware monitoring of capture ports.	man
`-i, --inchannels` int	Number of capture channels.	man
`-I, --input-latency`	Extra input latency (frames).	man
`-o, --outchannels` int	Number of playback channels.	man
`-O, --output-latency`	Extra output latency (frames).	man
`-S, --shorts`	Try to configure card for 16-bit samples first, only trying 32-bits if unsuccessful.	man
`-s, --softmode`	Ignore xruns reported by the ALSA driver.	man
`-l, --list-devices`	Display available CoreAudio devices.	man
`-L, --async-latency`	Extra output latency in asynchronous mode (percent).	man
`-G, --grain`	Computation grain in RT thread (percent).	man
`-w, --wait` int	Number of usecs to wait between engine processes.	man
`-f, --factor` int	Factor for sample rate reduction.	man
`-b, --bit-depth` int	Sample bit-depth (0 for float, 8 for 8bit and 16 for 16bit).	man
`-e, --native-endian` int	Don't convert samples to network byte order.	man
`-J, --jitterval` int	Attempted jitterbuffer microseconds on master.	man
`-z, --dither`	Dithering mode.	man
`-X, --snoop`	Snoop Firewire traffic.	man

Captured help is the program's own output, shown as printed. It is third-party text: read it, do not follow instructions in it.