everything stops after 2.1GB - Linux-audio-user

10 Nov 2016

...
  I didn't manage to get to the bottom of which
piece of software was causing the problem.

Sorry, it is both jack_rec and jack_capture.

Both use libsndfile, and neither should behave differently

when running on a 32 bit OS.

...
 *From the POV of libsndfile, it has had Large File
Support (which *makes file offsets 64 bit signed values) on 32 bit systems for over
a decade.

J.C: Could it be that your libsndfile is that old?

...
  However, it is possible for other software using
libsndfile incorrectly
 (ie using a 32 bit integer to store file offsets) to cause this sort
 of a problem, but then I would expect it to go wrong on 64 bit systems
 because `int` is 32 bits there too. However on 32 bit Linux systems,
 `long` whereas it us 64 bits on 64 bit Linux systems. 

Yes, but neither jack_rec or jack_capture uses long for this (jack_capture

uses int64_t), and jack_rec doesn't even use a counter, it just writes
and writes

until it stops. jack_capture has a counter, but that counter is only
used when writing

wav files, and only used to keep track of when to start writing on a
new file when reaching

the 4GB barrier.