[fluid-dev] fluidsynth 2.1.1 not creating a server

[Knute Snortum]

I am trying to get fluidsynth to start a server so that an outside
application (frescobaldi) can send MIDI events to it.  Here is what I
get when I try to do this:

$ fluidsynth -is /usr/share/sounds/sf2/FluidR3_GM.sf2
FluidSynth runtime version 2.1.1
Copyright (C) 2000-2020 Peter Hanappe and others.
Distributed under the LGPL license.
SoundFont(R) is a registered trademark of E-mu Systems, Inc.

fluidsynth: error: Failed to bind server socket: 98
Failed to create the server.
Continuing without it.
Cannot connect to server socket err = No such file or directory
Cannot connect to server request channel
fluidsynth: warning: Failed to set thread to high priority
jackdmp 1.9.12
Copyright 2001-2005 Paul Davis and others.
Copyright 2004-2016 Grame.
Copyright 2016-2017 Filipe Coelho.
jackdmp comes with ABSOLUTELY NO WARRANTY
This is free software, and you are welcome to redistribute it
under certain conditions; see the file COPYING for details
Cannot create RT messagebuffer thread: Operation not permitted (1)
Retrying messagebuffer thread without RT scheduling
Messagebuffer not realtime; consider enabling RT scheduling for user
no message buffer overruns
Cannot create RT messagebuffer thread: Operation not permitted (1)
Retrying messagebuffer thread without RT scheduling
Messagebuffer not realtime; consider enabling RT scheduling for user
no message buffer overruns
Cannot create RT messagebuffer thread: Operation not permitted (1)
Retrying messagebuffer thread without RT scheduling
Messagebuffer not realtime; consider enabling RT scheduling for user
no message buffer overruns
JACK server starting in realtime mode with priority 10
self-connect-mode is "Don't restrict self connect requests"
Cannot lock down 82280346 byte memory area (Cannot allocate memory)
audio_reservation_init
Acquire audio card Audio0
creating alsa driver ... hw:0|hw:0|1024|2|48000|0|0|nomon|swmeter|-|32bit
configuring for 48000Hz, period = 1024 frames (21.3 ms), buffer = 2 periods
ALSA: final selected sample format for capture: 32bit integer little-endian
ALSA: use 2 periods for capture
ALSA: final selected sample format for playback: 32bit integer little-endian
ALSA: use 2 periods for playback
Cannot use real-time scheduling (RR/10)(1: Operation not permitted)
AcquireSelfRealTime error
Cannot lock down 82280346 byte memory area (Cannot allocate memory)
fluidsynth: Jack sample rate mismatch, adjusting.
(synth.sample-rate=44100, jackd=48000)
Cannot use real-time scheduling (RR/5)(1: Operation not permitted)
JackClient::AcquireSelfRealTime error
JackTemporaryException : now quits...
Jack main caught signal 2
Released audio card Audio0
audio_reservation_finish

fluidsynth is trying to bind to socket 98, but according to
/etc/protocols, that socket is in use by another app.  Is there a way
to change sockets or will that just confuse frescobaldi?

I'm on Ubuntu 20.04, using the fluidsynth version that apt gets.

---
Knute Snortum
(via Gmail)