To use the program just type in "jack_capture"
in the terminal without any extra command line options:

$ jack_capture

The program will then start recording what you hear in your speakers into a stereo wav file.

Features:

• The 4GB size barrier for wav files is handled by continuing writing to new files when reaching 4GB.
• Autogenerated filenames are unique and humanly readable.
• Supports mp3 by using liblame.
• Supports all soundfile formats supported by sndfile. (wav, aiff, ogg, flac, wavex, au, etc.)
• jack_capture can connect to any input or output jack port.

Changes in v1.2

• Added exec-hooks
• Added timestamps
• Total recorded time shown in console, as minutes and seconds.
• Daemon option now suppresses all console messages
• Supports config file
• Backwards compatible JACK latency API.
• New option: --no-stdin. Works the same way as the old --daemon option.
• Fix writing to stdout.
• Don't use helper thread when writing to stdout.
• Applied Filipe Lopes' freewheel patch. Do not reconnect ports when freewheeling.
• Allow to remote-control jack-capture via OSC
• Bugfix