jack_rec doesn't work - disk thread finished

[danboid]

Describe the bug

I have been unable to get jack_rec to work. I get a disk thread finished message and a wav file of a few bytes.

Environment

• JACK Version: Which version of jack2 are you using? (e.g. the output of jackd --version or a git commit checksum)

1.9.20

• Operating System: What operating system or distribution in which version are you using? (e.g. Linux, macOS, Windows)

Ubuntu 22.04

• Installation: How did you install jack2? (e.g. package manager, from source)

apt

Steps To Reproduce

# jack_rec -f test.wav moc:output0 moc:output1
disk thread finished

It says disk thread finished immediately without me cancelling the process and I have plenty of disk space free to record with.

Also note there is a typo in the info text printed by jack_rec when you run it with no arguments:

usage: jackrec -f filename [ -d second ] [ -b bitdepth ] [ -B bufsize ] port1 [ port2 ... ]

Note it says jackrec instead of jack_rec.