Documentation:Modules/jack

for VLC media player 1.0.6 Goldeneye

JACK audio input (access_jack)

--jack-input-caching <integer>: Caching value in ms; Make VLC buffer audio data captured from jack for the specified length in milliseconds.
--jack-input-use-vlc-pace, --no-jack-input-use-vlc-pace: Pace (default disabled); Read the audio stream at VLC pace rather than Jack pace. (default disabled)
--jack-input-auto-connect, --no-jack-input-auto-connect: Auto Connection (default disabled); Automatically connect VLC input ports to available output ports. (default disabled)

--jack-auto-connect, --no-jack-auto-connect: Automatically connect to writable clients (default disabled); If enabled, this option will automatically connect sound output to the first writable JACK clients found. (default disabled)
--jack-connect-regex <string>: Connect to clients matching; If automatic connection is enabled, only JACK clients whose names match this regular expression will be considered for connection.

vlc -p jack --advanced --help-verbose