grab://audio-extract
                _
  __ _ _ __ __ _| |__
 / _` | '__/ _` | '_ \
| (_| | | | (_| | |_) |
 \__, |_|  \__,_|_.__/
 |___/
[ video::audio ] / stream capture ready
elaw142@grab:~$ ./grab SESSION=READY
[idle] awaiting source