When I swapped pulseaudio with pipewire, I did not use the swap argument, but installed pipewire over it:
  1. dnf install pipewire pipewire-pulseaudio --allowerasing
  2. reboot computer
  3. try that pipewire is running: pactl info check that pulseaudio server runs (on Pipewire)
I was successful with this on Fedora Rawhide. On Fedora, this brings me the following journalctl logs:

led 25 10:59:51 vseved rtkit-daemon[1089]: Successfully made thread 1668 of process 1668 (/usr/bin/pipewire-pulse) owned by '42' high priority at nice level -11.
led 25 10:59:51 vseved rtkit-daemon[1089]: Successfully made thread 1669 of process 1668 (/usr/bin/pipewire-pulse) owned by '42' RT at priority 20.
led 25 10:59:51 vseved rtkit-daemon[1089]: Successfully made thread 1727 of process 1727 (/usr/bin/pipewire) owned by '42' high priority at nice level -11.
led 25 10:59:52 vseved rtkit-daemon[1089]: Successfully made thread 1729 of process 1727 (/usr/bin/pipewire) owned by '42' RT at priority 20.
led 25 10:59:52 vseved rtkit-daemon[1089]: Successfully made thread 1840 of process 1840 (/usr/bin/pipewire-media-session) owned by '42' high priority at nice level -11.
led 25 10:59:52 vseved rtkit-daemon[1089]: Successfully made thread 1842 of process 1840 (/usr/bin/pipewire-media-session) owned by '42' RT at priority 20.
led 25 11:00:01 vseved rtkit-daemon[1089]: Successfully made thread 2354 of process 2354 (/usr/bin/pipewire-pulse) owned by '1000' high priority at nice level -11.
led 25 11:00:01 vseved rtkit-daemon[1089]: Successfully made thread 2355 of process 2354 (/usr/bin/pipewire-pulse) owned by '1000' RT at priority 20.
led 25 11:00:02 vseved rtkit-daemon[1089]: Successfully made thread 2593 of process 2593 (/usr/bin/pipewire) owned by '1000' high priority at nice level -11.
led 25 11:00:02 vseved rtkit-daemon[1089]: Successfully made thread 2595 of process 2593 (/usr/bin/pipewire) owned by '1000' RT at priority 20.
led 25 11:00:02 vseved rtkit-daemon[1089]: Successfully made thread 2741 of process 2741 (/usr/bin/pipewire-media-session) owned by '1000' high priority at nice level -11.
led 25 11:00:02 vseved rtkit-daemon[1089]: Successfully made thread 2751 of process 2741 (/usr/bin/pipewire-media-session) owned by '1000' RT at priority 20.
led 25 11:00:13 vseved systemd[1430]: pipewire-pulse.service: Succeeded.
led 25 11:00:13 vseved systemd[1430]: pipewire.service: Succeeded.
led 25 11:00:13 vseved systemd[1430]: pipewire-pulse.socket: Succeeded.
led 25 11:00:13 vseved systemd[1430]: pipewire.socket: Succeeded.
led 25 11:00:27 vseved pipewire-media-session[2741]: GetManagedObjects() failed: org.freedesktop.DBus.Error.NoReply
led 25 11:02:00 vseved pipewire-pulse[2354]: pulse-server 0x55ea4eb3b570: [Ovládání hlasitosti PulseAudio] ERROR command:87 (EXTENSION) tag:12 error:19 (Operation not supported)
led 25 11:02:00 vseved pipewire-pulse[2354]: pulse-server 0x55ea4eb3b570: [Ovládání hlasitosti PulseAudio] ERROR command:87 (EXTENSION) tag:13 error:19 (Operation not supported)
led 25 11:02:00 vseved pipewire-pulse[2354]: pulse-server 0x55ea4eb3b570: [Ovládání hlasitosti PulseAudio] ERROR command:87 (EXTENSION) tag:14 error:19 (Operation not supported)
led 25 11:02:00 vseved pipewire-pulse[2354]: pulse-server 0x55ea4eb3b570: [Ovládání hlasitosti PulseAudio] ERROR command:87 (EXTENSION) tag:15 error:19 (Operation not supported)
led 25 11:02:00 vseved pipewire-pulse[2354]: pulse-server 0x55ea4eb3b570: [Ovládání hlasitosti PulseAudio] ERROR command:87 (EXTENSION) tag:17 error:19 (Operation not supported)
led 25 11:02:00 vseved pipewire-pulse[2354]: pulse-server 0x55ea4eb3b570: [Ovládání hlasitosti PulseAudio] ERROR command:87 (EXTENSION) tag:19 error:19 (Operation not supported)
led 25 11:02:00 vseved pipewire-pulse[2354]: pulse-server 0x55ea4eb3b570: [Ovládání hlasitosti PulseAudio] ERROR command:87 (EXTENSION) tag:21 error:19 (Operation not supported)

Audio works and settings can be still done by pavucontrol, for example.

On Sun, Jan 24, 2021 at 6:28 PM Qiyu Yan <yanqiyu@fedoraproject.org> wrote:
My procedure:

1. sudo swap pulseaudio pipewire-pulseaudio --allowerasing --enablerepo=updates-testing

If you lost sound:

2. sudo systemctl enable --global pipewire-pulse.socket

The second step should be done automatically, but it's not the case for me...

Garry T. Williams <gtwilliams@gmail.com> 于 2021年1月25日周一 上午12:53写道:
What is the procedure for testing pipewire on a F33 system?

(I'm obviously doing something wrong since the bug seems to not make
sense to anyone: https://bugzilla.redhat.com/show_bug.cgi?id=1912150
and yet my system will not function at all for audio after I swap in
pipewire for pulseaudio.)

--
Garry T. Williams


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--

Lukáš Růžička

FEDORA QE, RHCE

Red Hat

Purkyňova 115

612 45 Brno - Královo Pole

lruzicka@redhat.com