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# PipeWire

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From ArchWiki

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- /Examples
- Sound system
- WirePlumber

PipeWire is a new low-level multimedia framework. It aims to offer capture and playback for both audio and video with minimal latency and support for PulseAudio, JACK, ALSA and GStreamer-based applications.

The daemon based on the framework can be configured to be both an audio server (with PulseAudio and JACK features) and a video capture server.

PipeWire also supports containers like Flatpak and does not rely on the `audio` and `video` user groups. Instead, it uses a Polkit-like security model, asking Flatpak or Wayland for permission to record screen or audio.

## Installation

Install the pipewire package from the official repositories. There is also lib32-pipewire for multilib support.

Pipewire uses systemd/User for management of the server and automatic socket activation.

Optionally, install pipewire-docs to review the documentation.

Pipewire can work as drop-in replacement for other audio servers. See #Audio for details.

### Session manager

Like JACK, PipeWire implements no connection logic internally. The burden of watching for new streams and connecting them to the appropriate output device or application is left to an external component known as a session manager.

#### WirePlumber

WirePlumber is the recommended session manager. It is based on a modular design, with Lua plugins that implement the actual management functionality.

The stock configuration files are stored in `/usr/share/wireplumber`. The recommended way to customize Wireplumber is adding snippets overriding specific settings in `/etc/wireplumber` or `~/.config/wireplumber`. [1].

WirePlumber changed its configuration format in version 0.5 from `.lua` to `.conf`. See https://pipewire.pages.freedesktop.org/wireplumber/daemon/configuration/migration.html#config-migration for migration instructions.

#### PipeWire Media Session

pipewire-media-session is deprecated and no longer recommended. It was mostly implemented for testing and as an example for building new session managers.

### GUI

- Cable — A PyQt application to dynamically modify PipeWire and WirePlumber settings at runtime.

  https://github.com/magillos/Cable || cableAUR

- coppwr — Low level control and diagnostic GUI for PipeWire.

  https://github.com/dimtpap/coppwr || coppwrAUR

- Helvum — GTK-based patchbay for PipeWire, inspired by the JACK tool catia. Does not save wire sets.

  https://gitlab.freedesktop.org/pipewire/helvum || helvum

- pwvucontrol — Pipewire Volume Control. Alternative to pavucontrol.

  https://github.com/saivert/pwvucontrol || pwvucontrolAUR

- qpwgraph — Qt-based Graph/Patchbay for PipeWire, inspired by the JACK tool QjackCtl. Saves wire sets.

  https://gitlab.freedesktop.org/rncbc/qpwgraph || qpwgraph

- sonusmix — Pipewire audio routing tool

  https://codeberg.org/sonusmix/sonusmix || sonusmixAUR

## Configuration

The PipeWire package provides an initial set of configuration files in `/usr/share/pipewire`. You should not edit these files directly, as package updates will overwrite your changes. To configure PipeWire, you can copy files from `/usr/share/pipewire` to the alternate system-wide location `/etc/pipewire`, or to the user location `~/.config/pipewire`. An equally named file in a directory with a higher precedence makes the analogous files ignored. [2]

### Profiles

Pipewire brings a custom "Pro Audio" profile in addition to the PulseAudio profiles, selectable through pavucontrol. The effect of which is described in the PipeWire wiki.

## Usage

### Audio

PipeWire can be used as an audio server, similar to PulseAudio and JACK. It aims to replace both PulseAudio and JACK, by providing a PulseAudio-compatible server implementation and ABI-compatible libraries for JACK clients. See the blog post PipeWire Late Summer Update 2020 for more information.

First, install pipewire-audio. Depending on the type of audio clients, you may also need to take some extra steps. You may need to install additional firmware for your audio device, see Advanced Linux Sound Architecture#Firmware.

#### ALSA clients

Install pipewire-alsa (and remove pulseaudio-alsa if it was installed) to route all applications using the ALSA API through PipeWire.

#### PulseAudio clients

Install pipewire-pulse. It will replace pulseaudio and pulseaudio-bluetooth. Reboot, re-login or stop `pulseaudio.service` and start the `pipewire-pulse.service` user unit to see the effect.

Normally, no further action is needed as the user service `pipewire-pulse.socket` should be enabled automatically by the package. To check if the replacement is working, run the following command for the Server Name and default input/output:

    $ pactl info

    ...
    Server Name: PulseAudio (on PipeWire x.y.z)
    ...
    Default Sink: alsa_output.{bus}-{device}.{profile}
    Default Source: alsa_input.{bus}-{device}.{profile}
    ...

pactl(1) is provided by PulseAudio client library package (libpulse), which is installed with pipewire-pulse as a dependency.

##### Setting overall or individual channel volume

To adjust output channel volume, the sink needs to be specified using `pactl get-sink-volume {sink`} using the value of Default Sink: (above) or Name: (below), default sink device (@DEFAULT_SINK@), or Sink # (e.g. 1 below):

    $ pactl list sinks | grep -B1 -A9 State:

    Sink #1
            State: RUNNING
            Name: alsa_output.pci-0000_2d_00.4.analog-surround-51
    ...
            Driver: PipeWire
    ...
            Mute: no
            Volume: front-left: 65536 / 100% / 0.00 dB,   front-right: 65536 / 100% / 0.00 dB,   rear-left: 65536 / 100% / 0.00 dB,   rear-right: 65536 / 100% / 0.00 dB,   front-center: 65536 / 100% / 0.00 dB,   lfe: 65536 / 100% / 0.00 dB
                    balance 0.00

Hint: if audio is playing, grep(1) for RUNNING as other devices will be SUSPENDED.

The balance ratio is calculated automatically. To set the overall volume of the default device use:

    pactl set-sink-volume @DEFAULT_SINK@ 75%

To set individual channels, provide each channel volume separately:

    pactl set-sink-volume @DEFAULT_SINK@ 100% 75% 100% 75% 100% 100%

Source inputs are handled similarly. For further configuration (e.g. regarding modules) see the official upstream Wiki about Migration from PulseAudio and Pipewire-Pulse Configuration.

#### JACK clients

Install pipewire-jack for JACK support. There is also lib32-pipewire-jack for multilib support.

pw-jack(1) may be used to start JACK clients, but it is technically not required, as it only serves as a wrapper around the `PIPEWIRE_REMOTE`, `PIPEWIRE_DEBUG` and `PIPEWIRE_LATENCY` environment variables.

It is possible to request a custom buffer size by setting a quotient of buffersize/samplerate (which equals the block latency in seconds):

    PIPEWIRE_LATENCY="128/48000" application

#### Bluetooth devices

PipeWire handles Bluetooth audio devices if the pipewire-audio package is installed.

##### Automatic profile selection

WirePlumber has profile auto-switching enabled by default. It can automatically switch between HSP/HFP and A2DP profiles whenever an input stream is detected. You can disable it with the following command:

    $ wpctl settings --save bluetooth.autoswitch-to-headset-profile false

pipewire-media-session has it disabled by default. You can set `bluez5.autoswitch-profile` property to `true` to enable it:

    /etc/pipewire/media-session.d/bluez-monitor.conf (or ~/.config/pipewire/media-session.d/bluez-monitor.conf)

    ...
    rules = [
        {
            ...
            actions = {
                update-props = {
                    ...
                    bluez5.autoswitch-profile = true
    ...

#### PipeWire patch sets for command line

qpwgraph can be used to visualize and create connections, and also save and load patch sets.

For non-GUI needs, the following are bash scripts to save wiresets, load wiresets, and dewire all connections. For saving and loading, use a command-line parameter for the filename.

    pw-savewires

    #!/bin/bash

    if [[ "$#" -ne 1 ]]; then
        echo
        echo 'usage: pw-savewires filename'
        echo
        exit 1
    fi

    rm -- "$1" &> /dev/null

    link_nodeOutput=''

    while IFS= read -r line; do
        if [[ "$line" =~ [|] ]];
        then
            link_nodeInput=`echo $line | cut -d ">" -f 2`
            echo "Saving $link_nodeOutput, ${link_nodeInput//' '}"
            echo "$link_nodeOutput ${link_nodeInput//' '}" >> "$1"
        else
            link_nodeOutput="$line"
        fi
    done < <(pw-link -lo)

    pw-loadwires

    #!/bin/bash

    if [[ "$#" -ne 1 ]]; then
        echo
        echo 'usage: pw-loadwires filename'
        echo
        exit 1
    fi

    while IFS= read -r line; do
        echo "Connecting $line"
        pw-link $line
    done < <(cat -- "$1")

    pw-dewire

    #!/bin/bash

    link_nodeOutput=''

    while IFS= read -r line; do
        if [[ "$line" =~ [|] ]];
        then
            link_nodeInput=`echo $line | cut -d ">" -f 2`
            echo "Removing $link_nodeOutput, ${link_nodeInput//' '}"
            pw-link -d $link_nodeOutput ${link_nodeInput//' '}
        else
            link_nodeOutput="$line"
        fi
    done < <(pw-link -lo)

#### Sharing audio devices with computers on the network

PipeWire supports sharing audio over the network using several mechanisms, including:

- AES67
- RTP
- Apple Airplay (without DRM features)
- JACK (netjack2)
- Roc
- PipeWire Native RTP
- PulseAudio's network protocol
- Snapcast

The PipeWire wiki includes an overview and comparison page for the different network protocols.

The Pulse Tunnel method is described below. The PipeWire PulseAudio implementation supports network streaming. An easy way to share audio between computers on the network is to use the Avahi daemon for discovery. To enable this functionality, install the pipewire-zeroconf package.

Make sure that the `avahi-daemon.service` is running (and UDP port `5353` is open if using a firewall) on all computers that will be sharing audio.

Note: Some GUI volume managers hide network cards by default. (ex: in Plasma one has to "Configure Audio Volume..." and check "Show virtual devices".

To share the local audio devices load the appropriate modules on the host (make sure to use the local IP address):

    $ pactl load-module module-native-protocol-tcp listen=192.168.1.10
    $ pactl load-module module-zeroconf-publish

Then load the discovery module on the clients:

    $ pactl load-module module-zeroconf-discover

It is also possible to load the modules automatically by creating a dedicated configuration file:

    /etc/pipewire/pipewire-pulse.conf.d/50-network-party.conf (or ~/.config/pipewire/pipewire-pulse.conf.d/50-network-party.conf)

    pulse.cmd = [
        { cmd = "load-module" args = "module-native-protocol-tcp listen=192.168.1.10" }
        { cmd = "load-module" args = "module-zeroconf-discover" }
        { cmd = "load-module" args = "module-zeroconf-publish" }
    ]

##### Streaming audio to an AirPlay receiver

It is possible to stream audio to a device that is posing as an AirPlay Receiver. To enable this functionality, load the RAOP Discover module:

    $ pactl load-module module-raop-discover

It is also possible to load this module automatically by creating a dedicated configuration file:

    /etc/pipewire/pipewire.conf.d/raop-discover.conf (or ~/.config/pipewire/pipewire.conf.d/raop-discover.conf)

    context.modules = [
       {
           name = libpipewire-module-raop-discover
           args = { }
       }
    ]

Some speakers' AirPlay implementations (like Sonos AirPlay 2 speakers) may require opening up ports 6001 and 6002 for incoming UDP traffic on your source device.

#### Run PipeWire on top of native JACK

PipeWire can also run as a JACK client on top of the native JACK daemon if desired.

See JACK and PipeWire (PipeWire wiki) and JACK Bridge (PipeWire wiki) for more information and additional configuration (like available channels for example).

To use it install the pipewire-jack-client and start JACK. Pipewire should be bridged automatically.

Note: Since pipewire 0.3.81 loading the jackdbus module is done automatically and is no longer necessary.

It can manually be loaded (as explained by pactl(1)) like a PulseAudio module: `pactl load-module module-jackdbus-detect` before starting jack.

#### Use ALSA dmix devices as PipeWire sinks

It is possible to have a PipeWire server (or multiple, for each user) output to ALSA via ALSA dmix devices. This allows you to use ALSA as the primary audio output system while being able to use non-ALSA devices such as Bluetooth headphones.

##### ALSA dmix setup

Suppose you have two cards, `PCH` and `HDMI`:

    /proc/asound/cards

     0 [PCH            ]: HDA-Intel - HDA Intel PCH
                          HDA Intel PCH at 0xdff40000 irq 146
     1 [HDMI           ]: HDA-Intel - HDA ATI HDMI
                          HDA ATI HDMI at 0xdfe60000 irq 147

and your PCMs look like:

    /proc/asound/pcm

    00-00: ALC1220 Analog : ALC1220 Analog : playback 1 : capture 1
    00-02: ALC1220 Alt Analog : ALC1220 Alt Analog : capture 1
    01-03: HDMI 0 : HDMI 0 : playback 1
    01-07: HDMI 1 : HDMI 1 : playback 1
    01-08: HDMI 2 : HDMI 2 : playback 1
    01-09: HDMI 3 : HDMI 3 : playback 1
    01-10: HDMI 4 : HDMI 4 : playback 1
    01-11: HDMI 5 : HDMI 5 : playback 1

and suppose your ALSA configuration looks something like this:

    /etc/asound.conf

    ctl.!default {
      type hw
      card PCH
    }

    pcm.!default {
      type plug
      slave.pcm "dmix:PCH,0"
    }

    pcm.dhdmi {
      type plug
      slave.pcm "dmix:HDMI,9"
    }

In this particular example, the dmix devices would be `dmix:PCH,0` and `dmix:HDMI,9`.

##### PipeWire dmix setup

First of all, stop WirePlumber from monitoring and adding hardware ALSA devices by disabling the `monitor.alsa` feature:

    /etc/wireplumber/wireplumber.conf.d/disable-alsa-monitor.conf (or ~/.config/wireplumber/wireplumber.conf.d/disable-alsa-monitor.conf)

    wireplumber.profiles = {
      main = {
        monitor.alsa = disabled
      }
    }

Now, configure PipeWire to use dmix devices. The default configuration file (`/usr/share/pipewire/pipewire.conf`) contains a commented out example which you can use as a basis.

Add your own element to the `context.objects` array:

    /etc/pipewire/pipewire.conf.d/alsa-dmix.conf (or ~/.config/pipewire/pipewire.conf.d/alsa-dmix.conf)

    context.objects = [
        # We do not start with dmix, but with an input device.
        # Do not forget to add an input device.
        # On a friend's Laptop, I saw Zoom having a nervous
        # breakdown and endlessly crying because no input device
        # was configured! You have been warned.
        { factory = adapter
            args = {
                factory.name           = api.alsa.pcm.source
                node.name              = "alsa-mic-internal" # name of pulse device (mpv)
                node.description       = "Mic Internal" # name of pulse device (pavucontrol)
                media.class            = "Audio/Source"
                api.alsa.path          = "hw:PCH,0"
            }
        }
        # Okay, now we add our dmix PCMs
        { factory = adapter
            args = {
                factory.name           = api.alsa.pcm.sink # sink for dmix
                node.name              = "alsa-dmix-internal" # name of pulse device (mpv)
                node.description       = "PCM Internal" # name of pulse device (pavucontrol)
                media.class            = "Audio/Sink" # Sink for dmix
                api.alsa.path          = "dmix:PCH,0"
            }
        }

        { factory = adapter
            args = {
                factory.name           = api.alsa.pcm.sink # sink for dmix
                node.name              = "alsa-dmix-hdmi" # name of pulse device (mpv)
                node.description       = "PCM HDMI" # name of pulse device (pavucontrol)
                media.class            = "Audio/Sink" # Sink for dmix
                # remember this is a non-default dmix from /etc/asound.conf
                api.alsa.path          = "dmix:HDMI,9"
            }
        }
    ]

As a user (non-root), check out the output of `wpctl status`, and set the default input(source) and output(sink) devices to your liking with `wpctl set-default ID`. `ID` is the number before sink/source names.

Now, you can fully test your configuration.

#### Switching between device profiles

Some hardware audio devices, like `snd_hda_intel`, function differently depending on which profile the device is running in. In the case of `snd_hda_intel`, there are separate profiles for HDMI and analog output.

Switching to HDMI with WirePlumber:

    $ wpctl set-profile <device-ID> 3
    $ wpctl status

    ...
    ├─ Sinks:
    │  *   53. Built-in Audio Digital Stereo (HDMI) [vol: 1.00]
    ...

Switching to analog with WirePlumber:

    $ wpctl set-profile <device-ID> 1
    $ wpctl status

    ...
    ├─ Sinks:
    │  *   51. Built-in Audio Analog Stereo        [vol: 0.60]
    ...

### WebRTC screen sharing

Most applications used to rely on X11 for capturing the desktop (or individual applications), for example when using WebRTC in web browsers (e.g. on Google Meet). On Wayland, the screen sharing mechanism is handled through the XDG Desktop Portal and PipeWire, which enables sharing content under Wayland with fine-grained access controls.

Tip: Test whether WebRTC screen sharing is working by using Mozilla's GetUserMedia WebRTC test page.
Note: xdg-desktop-portal 1.10.0 fixed a mismatch between specification and implementation of its D-Bus interface. [3] Hence, some clients may not work with xdg-desktop-portal 1.10.0 or newer.

Firefox (84+) and Chromium (110+) support this method by default, while on older versions of Chromium (73+), one needs to enable WebRTC PipeWire support by setting the corresponding (experimental) flag at the URL `chrome://flags/#enable-webrtc-pipewire-capturer` or via CLI argument `--enable-features=WebRTCPipeWireCapturer`.

obs-studio (27+) supports this method by using the new PipeWire capture source.

### Video

This article or section needs expansion.

Reason: pipewire-v4l2 (Discuss in Talk:PipeWire)

Although the software is not yet production-ready, it is safe to play around with. Most applications that rely on GStreamer to handle e.g. video streams should work out-of-the-box using the PipeWire GStreamer plugin, see GStreamer#PipeWire. Applications like e.g. cheese are therefore already able to share video input using it.

Using pipewire-v4l2, it should also be possible to use the `pw-v4l2` script to preload a library (`/lib/pipewire-0.3/v4l2/libpw-v4l2.so`) that intercepts v4l2 calls and routes video through pipewire.

## Audio post-processing

### Pipewire module-filter-chain

Pipewire has an internal module called filter-chain that can create nodes to process audio input and output. See `/usr/share/pipewire/filter-chain/` for examples including equalization, virtual surround sound, LADSPA plugins and channel mixing.

#### LADSPA

You can install many LADSPA plugins from the official repositories and use them in Pipewire filter chains. To list plugin labels and available controls provided by a specific file use `analyseplugin` from the ladspa package:

    $ analyseplugin /usr/lib/ladspa/lsp-plugins-ladspa.so

#### Systemwide parametric equalization

Copy `/usr/share/pipewire/filter-chain/sink-eq6.conf` to `/etc/pipewire/pipewire.conf.d/` (or `~/.config/pipewire/pipewire.conf.d/`).

Then edit `sink-eq6.conf` to incorporate the desired parameters. For headphones, these can be obtained from Oratory1990's database or, if not listed there, the AutoEQ project.

If you require a pre-amp, modify `eq_band_1` to apply a `bq_highshelf` filter at frequency 0Hz with a negative gain (gains from -120 to +20dB supported):

    label = bq_highshelf
    control = { "Freq" = 0 "Q" = 1.0 "Gain" = -7.5 }

For more than 6 bands, add more entries to the `nodes` list and corresponding `links` connecting one filter ":Out" to the next filter ":In", for instance to increase to 11 bands (preamp + 10):

                        { output = "eq_band_6:Out" input = "eq_band_7:In" }
                        { output = "eq_band_7:Out" input = "eq_band_8:In" }
                        { output = "eq_band_8:Out" input = "eq_band_9:In" }
                        { output = "eq_band_9:Out" input = "eq_band_10:In" }
                        { output = "eq_band_10:Out" input = "eq_band_11:In" }

Restart Pipewire, select "Equalizer Sink" as your default sound output device; this should then apply to all applications.

### EasyEffects

EasyEffects (former PulseEffects) is a GTK utility which provides a large array of audio effects and filters to individual application output streams and microphone input streams. Notable effects include an input/output equalizer, output loudness equalization and bass enhancement, input de-esser and noise reduction plug-in. See the GitHub page for a full list of effects.

Note: Firefox has an issue with microphone stream, see Github issue.

In order to use EasyEffects, install easyeffects. See Community Presets for a collection of preset configurations. See AutoEq for collection of algorithmically generated EQ presets for headphones.

Note: EasyEffects may crash after starting, throwing gtk errors, see Github issue for work around.
Note: For PulseEffects legacy version, see PulseAudio#PulseEffects.

### NoiseTorch

NoiseTorch is an alternative way for noise suppression, packaged with noisetorchAUR. There also exists noisetorch-gitAUR.

After starting it the module can be loaded for the selected microphone. It is possible to adjust the voice activation threshold, which should be set to the highest level, not filtering out any actual voice.

You can start audio processing with systemd automatically, see [4]. Note that the noisetorch binary path is different if installed from AUR.

### Noise suppression for voice

Install the noise-suppression-for-voice package.

Then simply follow the instructions given on GitHub.

### JamesDSP

JamesDSP for Linux (available as jamesdspAUR) provides open-source sound effects for PipeWire and PulseAudio. It uses its own effects engine and without depending on LADSPA, Calf, etc. JamesDSP was initially published as an audio effects processor for Android devices.

### Using LADSPA, LV2 and VST plugins

If you want to choose between the full list of available LADSPA, LV2 and VST plugins, you can apply them using carla with pipewire-jack.

Start Carla and go to Settings > Configure Carla > Engine. Make sure Audio driver is set to JACK and choose a process mode depending on your needs. You can also choose the process mode by running Carla with a specific command, for example `carla-rack` for the Continuous Rack mode.

You can connect application outputs to Carla manually, but if you want to pass multiple applications through Carla, it might be more convenient to create a single virtual device between applications and Carla and optionally use it as a default device. At the begin, create a new null sink named `default_null_sink`.

    /etc/pipewire/pipewire.conf.d/10-default-null-sink.conf (or ~/.config/pipewire/pipewire.conf.d/10-default-null-sink.conf)

    context.objects = [
      {
        factory = adapter
        args = {
          factory.name = support.null-audio-sink
          node.name = "default_null_sink"
          media.class = Audio/Sink
          audio.position = [ FL FR ]
          monitor.channel-volumes = true
          monitor.passthrough = true
        }
      }
    ]

Restart PipeWire to apply changes.

Alternatively, you can create a temporary virtual device with pw-cli(1) or, if pipewire-pulse is installed, with pactl(1). See the PipeWire wiki for details.

In the Rack tab, add whichever plugin you want. Make sure they are stereo type. You can change their order. In the Continuous Rack process mode, the one on top of the list will be the first to receive the audio stream, just like in EasyEffects. Afterwards go to the Patchbay tab and connect the `default_null_sink` L/R monitors to Carla inputs, then Carla outputs to the playbacks of your desired device (speakers, earphones, HDMI, etc). Save the configuration to a local file, for example `~/Documents/carla_sink_effects.carxp`. Carla will automatically restore the connections after opening this file.

You can test the effects while a multimedia application is reproducing audio, i.e. watching a video on a website through Firefox. There are two methods to do it. The first one, inside Carla Patchbay tab, disconnecting all Firefox connections and linking its L/R outputs to `default_null_sink` playbacks. The second through pavucontrol, locating Firefox audio stream and redirecting it to `default_null_sink` (this should remember the connection to automatically redirect the application to the same sink on the next instance).

To run Carla with the Continuous Rack process mode and load the saved file at startup, create a systemd user service:

    ~/.config/systemd/user/jack-carla-rack.service

    [Unit]
    Description=Load Carla Rack JACK host

    [Service]
    Environment=PIPEWIRE_LINK_PASSIVE=true
    Type=exec
    ExecStart=/usr/bin/carla-rack --no-gui %h/Documents/carla_sink_effects.carxp

    [Install]
    WantedBy=default.target

Then enable the `jack-carla-rack.service` user unit.

Note that if you set the `default_null_sink` as the default device in system settings, all applications will be redirected to it and the volume keys will change its level, not the one on the speakers. If you want to control volume speakers, leave them as the default in system settings and redirect your desired application to `default_null_sink` inside pavucontrol (Pipewire compatibility layer will remember the connection on the next instance of the same application).

## Troubleshooting

This article or section is a candidate for merging with PipeWire/Troubleshooting.

Notes: This section is long enough to be split into a dedicated subpage. (Discuss in Talk:PipeWire#Move Troubleshooting into a new separate page)

### Audio

#### Microphone is not detected by PipeWire

PipeWire's `alsa-monitor` module uses alsa-card-profiles to detect devices by default. If this is not working for you, try to turn off `api.alsa.use-acp`, or optionally turn on `api.alsa.use-ucm` in wireplumber:

    /etc/wireplumber/wireplumber.conf.d/alsa-config.conf (or ~/.config/wireplumber/wireplumber.conf.d/alsa-config.conf)

    monitor.alsa.properties = {
      # Use ALSA-Card-Profile devices. They use UCM or the profile
      # configuration to configure the device and mixer settings.
      # alsa.use-acp = true
      # Use UCM instead of profile when available. Can be disabled
      # to skip trying to use the UCM profile.
      alsa.use-ucm = true
    }

With pipewire-media-session:

    /etc/pipewire/media-session.d/alsa-monitor.conf (or ~/.config/pipewire/media-session.d/alsa-monitor.conf)

    ...
    rules = [
        {
            ...
            actions = {
            update-props = {
                ...
                api.alsa.use-acp = false
    ...

Then, restart WirePlumber and check available devices:

This article or section is out of date.

Reason: Option `--list-targets` is no longer available in the recent versions of `pw-record`; in order to list objects use either `wpctl status` or `pw-cli ls` or `pw-dump` instead. (Discuss in Talk:PipeWire)

    $ pw-record --list-targets

    Available targets ("*" denotes default): 62
    	58: description="Built-in Audio" prio=1872
    	60: description="Built-in Audio" prio=2000
    *	62: description="Built-in Audio (Loopback PCM)" prio=1984

An alternative solution suggested in this PipeWire issue is to add the microphone manually. First of all, make sure the microphone is detected by ALSA.

    $ arecord -l

    **** List of CAPTURE Hardware Devices ****
    card card_number: card_name, device device_number: device_name
      ...

Choose your microphone from the list, and to further test the microphone, run the following commands.

    $ arecord --duration=5 --format=dat --device=hw:card_number,device_number test-mic.wav # record from the mic
    $ aplay test-mic.wav # play it

If the microphone is working with `arecord`, but not detected by PipeWire, try to add a config file to manually add this device.

    /etc/pipewire/pipewire.conf.d/microphone.conf (or ~/.config/pipewire/pipewire.conf.d/microphone.conf)

    context.objects = [
        { factory = adapter
            args = {
                factory.name           = api.alsa.pcm.source
                node.name              = "microphone"
                node.description       = "Undetected Microphone"
                media.class            = "Audio/Source"
                api.alsa.path          = "hw:card_number,device_number"
            }
        }
    ]

And then restart PipeWire to reload the config.

#### Sound does not automatically switch when connecting a new device

To automatically switch to newly connected devices, create this file:

    /etc/pipewire/pipewire-pulse.conf.d/switch-on-connect.conf (or ~/.config/pipewire/pipewire-pulse.conf.d/switch-on-connect.conf)

    pulse.cmd = [
        { cmd = "load-module" args = "module-switch-on-connect" }
    ]

Then restart the `pipewire-pulse.service` with systemctl --user and check that `module-switch-on-connect` is loaded.

#### No sound after connecting to Bluetooth device

As of 2020-12-07, if there is no sound after connecting a Bluetooth device, you might need to switch the default sink and/or move a sink input to the correct sink. Use `pactl list sinks` to list the available sinks and `pactl set-default-sink` to switch the default sink to the Bluetooth device. This can be automated via udev using a script similar to this one.

See this Reddit thread for a discussion of the issue. According to author of the script, the headset profile (HSP) might still have problems.

#### No sound in mpv, vlc, totem, but sound works in web browser and GNOME speaker test

The factual accuracy of this article or section is disputed.

Reason: The writing style is not wiki, but more like a blog. It needs a rephrase + shortening. Sub chapters are overkill as well. Issue root cause is guessed not verified. (Discuss in Talk:PipeWire)

##### Condition description

The best tool to verify the condition of this issue is to use `mpv` on a file that is expected to work with installed codecs:

    $ mpv --ao=alsa test_file.mpv
    $ mpv --ao=pcm test_file.mpv
    $ mpv --ao=jack test_file.mpv
    $ mpv --ao=pulse test_file.mpv
    $ mpv --ao=openal test_file.mpv

This recipie applies if some or all of the above tests produce sound and the same test with `pipewire` option does not produce sound:

    $ mpv --ao=pipewire test_file.mpv

Gnome desktop speaker test and web browser 'youtube' produce valid sound outcomes.

Switching inputs, muting, unmuting, changing volume in Gnome does not resolve the issue.

Sink status reported by `pactl list sinks` as 'SUSPENDED' is of no concern, because status properly changes when running video through a web browser.

Use of `pactl info` does not point to any obvious issues.

Inspection of relevant `systemd` unit logs does not point to any obvious issues.

##### Reason for the issue

It seems that a path from `pipewire` to hardware got muted or changed somehow. The original author does not know how to identify and point out at the issue using command line tooling.

##### Solution

Install the pavucontrol package. Run `pavucontrol`, select the appropriate source in the Configuration tab, select it again in the Output device tab and then use Mute button to mute and unmute the source while `mpv --ao=pipewire test.mp4` video is running.

#### Low volume

After replacing PulseAudio with Pipewire, sound may work fine, but after a reboot, the volume becomes intolerably low.

Open `alsamixer`, use `F6` to select the proper soundcard, and make sure the ALSA volumes are at 100%. `alsactl` should maintain this setting after reboot.

#### Increasing RLIMIT_MEMLOCK

    Dec 13 11:11:11 HOST pipewire-pulse[99999]: Failed to mlock memory 0x7f4f659d8000 32832: This is not a problem but for best performance, consider increasing RLIMIT_MEMLOCK

Install realtime-privileges and add your own user to the `realtime` group.

Alternatively, increasing memlock from 64kB to 128kB seems enough to fix this. If you are running `pipewire-pulse` under systemd/User, add:

    username	soft	memlock	64
    username	hard	memlock	128

to `/etc/security/limits.d/username.conf`

#### Changing the default sample rate

By default PipeWire sets a fixed global sample rate of 48kHz. If you need to change it (e.g. you own a DAC supporting a higher value), you can set a new default:

    /etc/pipewire/pipewire.conf (or ~/.config/pipewire/pipewire.conf)

    ...
    context.properties = {
        ...
        default.clock.rate          = sample_rate
        ...

#### Changing the allowed sample rate(s)

PipeWire can also change dynamically the output sample rates supported by your DAC. The sample rate follows the sample rate of the audio stream being played.

    ~/.config/pipewire/pipewire.conf

    ...
    context.properties = {
        ...
        default.clock.allowed-rates = [ sample_rate_1 sample_rate_2 sample_rate_3 ... ]
        ...

for example, `[ 44100 48000 88200 96000 ]`.

According to the developer: "PipeWire allows up to 16 different sample rates and will switch when possible". That means, with configuration above, no resampling is done when supported. Since PipeWire 0.3.61 up to 32 different sample rates can be configured.

##### Getting allowed sample rate(s)

Consult your hardware manual for supported values of your DAC. Supported rates by the kernel driver codec are listed with the following command.

    $ grep -E 'Codec|Audio Output|rates' /proc/asound/card*/codec#*

If your DAC does not report codec information, you can try to obtain supported rates like this:

    $ grep -m1 -Hn "" /proc/asound/card?/stream? | tee /dev/tty | awk -F':' '{print $1}' | xargs grep 'Rates'

Note: Although your DAC chip may report rates higher than advertised in specification, some of them were designed for exotic modes like USB to I2S

##### Checking currently used sample rate

To check which output sample rate is being used for a card run:

    $ grep rate: /proc/asound/card?/pcm??/sub?/hw_params

    /proc/asound/card1/pcm0p/sub0/hw_params:rate: 96000 (96000/1)

In `pcm0p` or `pcm0c` `c` is short for "capture" and `p` is for "playback".

Command:

    $ pw-top

also shows currently used sample rate for each card and audio stream.

Tip: If your DAC will not switch to a higher rate, after setting default.clock.allowed-rates, it may mean that system cannot read rates supported by DAC. In such case you can still try setting default.clock.rate

#### Sound quality (resampling quality)

If you used PulseAudio with `resample-method = speex-float-10` or `soxr-vhq`, then you might consider setting `resample.quality` to `10` or the maximum `14`:

    /etc/pipewire/client.conf.d/resample.conf (or ~/.config/pipewire/client.conf.d/resample.conf)

    stream.properties = {
        resample.quality = 10
    }

Do not forget to restart the `pipewire.service` and `pipewire-pulse.socket` user units (never forget `pipewire-pulse.socket` if you want your configuration changes to be applied).

There is a very little quality difference between `10` and `14`, but the CPU load difference is 2-3x. And the latency difference between `4`, `10`, `14` is yet to be investigated by anybody. `resample.quality = 14` on 44100→48000 Hz on Ryzen 2600 causes `pipewire` or `pipewire-pulse` processes to cause 4.0% one CPU core load.

You can compare resamplers here: https://src.infinitewave.ca/ (do not pay attention to anything above 18 KHz and over 120 dB). speex is listed as "Xiph.org Speex".

PipeWire uses its own resampling algorithm called Spa. Like with SoX's `sox`, Speex's `speexenc`, PipeWire includes its standalone version: `spa-resample`. Usage:

    $ spa-resample -q 14 -f s24 -r 48000 input16bit44100orAnythingElse.wav output24bit48000hz.wav

It is probably somehow possible to use other resamplers by creating your own sink. Or just use a plugin in your music player (e.g., Qmmp has SoX plugin).

#### External sound card not activated after reconnect

Check `~/.config/pipewire/media-session.d/default-profile` if there is any entry with default profile "off" and remove it. If that does not help, remove all files from `~/.config/pipewire/media-session.d/` and restart the `pipewire.service` user unit.

#### No Sound or pactl info shows Failure: Connection refused

It means applications are unable to connect to the PipeWire-Pulse service check if the `pipewire-pulse.service` user unit is running.

If that does not fix it, run `strace -f -o /tmp/pipe.txt pactl info` and pastebin `/tmp/pipe.txt` while seeking help on IRC (#pipewire on OFTC) or the mailing-lists.

#### Low audio quality on Bluetooth

In case Bluetooth playback stutters, check the unit status of the `pipewire.service` user unit for errors similar as below:

    Feb 17 18:23:01 HOST pipewire[249297]: (bluez_input.18:54:CF:04:00:56.a2dp-sink-60) client too slow! rate:512/48000 pos:370688 status:triggered

If they appear, check the currently selected codec using `pactl list sinks` and try changing it by setting `bluez5.codecs` to one of `sbc aac ldac aptx aptx_hd`. You can also try mSBC support (fixes mic on Sony 1000XM3, i.e. Headphones WH-1000XM3 and Earbuds WF-1000XM3), and the SBC-XQ codec.

Note: Headphones like the WH-1000XM3 refuse to advertise any codecs other than SBC/SBC-XQ if "Sound Quality Mode" is set to "Priority On Stable Connection" instead of "Prioritize Sound Quality" in the companion app.

With wireplumber:

    /etc/wireplumber/wireplumber.conf.d/bluez-config.conf (or ~/.config/wireplumber/wireplumber.conf.d/bluez-config.conf)

    monitor.bluez.properties = {
      bluez5.enable-sbc-xq = true
      bluez5.enable-msbc = true
      bluez5.codecs = [ sbc sbc_xq ]
    }

With pipewire-media-session:

    /etc/pipewire/media-session.d/bluez-monitor.conf (or ~/.config/pipewire/media-session.d/bluez-monitor.conf)

    ...
    properties = {
      ...
      bluez5.enable-msbc = true
      bluez5.enable-sbc-xq = true
      bluez5.codecs = [sbc sbc_xq]
    ...

Restart PipeWire by restarting the `pipewire.service` user unit for the changes to take effect.

#### Noticeable audio delay or audible pop/crack when starting playback

This is caused by node suspension when inactive.

With wireplumber, create a new file to overwrite the default configuration:

    /etc/wireplumber/wireplumber.conf.d/disable-suspension.conf (or ~/.config/wireplumber/wireplumber.conf.d/disable-suspension.conf)

    monitor.alsa.rules = [
      {
        matches = [
          {
            # Matches all sources
            node.name = "~alsa_input.*"
          },
          {
            # Matches all sinks
            node.name = "~alsa_output.*"
          }
        ]
        actions = {
          update-props = {
            session.suspend-timeout-seconds = 0
          }
        }
      }
    ]
    # bluetooth devices
    monitor.bluez.rules = [
      {
        matches = [
          {
            # Matches all sources
            node.name = "~bluez_input.*"
          },
          {
            # Matches all sinks
            node.name = "~bluez_output.*"
          }
        ]
        actions = {
          update-props = {
            session.suspend-timeout-seconds = 0
          }
        }
      }
    ]

Restart `pipewire.service` and `wireplumber.service` to apply changes.

Instead of disabling suspension entirely, you can also change the timeout value to the desired number of seconds of delay before source suspension.

Some devices implement their own detection of silence and suspension. For them disabling node suspention alone won't work. It's possible to work around them by adding a small amount of noise, making it so the output never goes fully silent:

    .../disable-suspension.conf

    ...
        session.suspend-timeout-seconds = 0,  # 0 disables suspend
        dither.method = "wannamaker3", # add dither of desired shape
        dither.noise = 2, # add additional bits of noise
    ...

It may be necessary to play with `dither.noise` and `dither.method` parameters to make it so the noise is sufficiently silent and simultaneously loud enough to prevent detection of silence. See PipeWire documentation.

With pipewire-media-session:

Disable this by editing `/etc/pipewire/media-session.d/*-monitor.conf` depending on where the delay occurs and changing property `session.suspend-timeout-seconds` to 0 to disable or experiment with other values and see what works.

Alternatively you can comment out the line `suspend-node` in `/etc/pipewire/media-session.d/media-session.conf`.

Restart both `pipewire.service` and `pipewire-pulse.service` to apply these changes, or alternatively reboot.

#### Audio cutting out when multiple streams start playing

This problem can typically be diagnosed by reading the journal of the `pipewire-pulse.service` user unit and finding lines similar to:

    pipewire-pulse[21740]: pulse-server 0x56009b9d5de0: [Nightly] UNDERFLOW channel:0 offset:370676 underrun:940

According to the official PipeWire troubleshooting guide, to solve this problem for wireplumber:

    /etc/wireplumber/wireplumber.conf.d/alsa-config.conf (or ~/.config/wireplumber/wireplumber.conf.d/alsa-config.conf)

    monitor.alsa.rules = [
      {
        matches = [
          {
            node.name = "~alsa_output.*"
          }
        ]
        actions = {
          update-props = {
            api.alsa.period-size   = 1024
            api.alsa.headroom      = 8192
          }
        }
      }
    ]

With pipewire-media-session:

    /etc/pipewire/media-session.d/alsa-monitor.conf (or ~/.config/pipewire/media-session.d/alsa-monitor.conf

    api.alsa.headroom = 1024

If you experience audio stuttering because of kernel page locking or late scheduling see Gaming#Tweaking kernel parameters for response time consistency.

#### Audio is distorted

- For microphones, try navigating to the card that is having issues after running `alsamixer` and use the arrow keys to reduce any "Mic Boost" or "Internal Mic Boost" options.
- Follow #Changing the default sample rate, reducing the sample rate to `44100` (44.1 kHz).

#### Audio problems after standby

If the sound is missing or otherwise garbled after waking the machine up from sleep, it might help to reinitialize ALSA:

    # alsactl init

#### High latency with USB DACs (e.g. Schiit DACs)

Changing sample rates or formats might help reduce latency with some DACs such as Schiit Hel 2.[5]

For pipewire-media-session:

Copy the default configuration file `/usr/share/pipewire/media-session.d/alsa-monitor.conf` into `/etc/pipewire/media-session.d/` (or `~/.config/pipewire/media-session.d/`). Then append a new rule-block similar to the following one:

    /etc/pipewire/media-session.d/alsa-monitor.conf (or ~/.config/pipewire/media-session.d/alsa-monitor.conf)

    ...
    rules = {
        ...
        {
            matches = [
                {
                    node.name = "alsa_output.name-of-node"
                }
            ]
            actions = {
                update-props = {
                    audio.format = "S24_3LE"
                    audio.rate = 96000
                    # Following value should be doubled until audio does not cut out or other issues stop occurring
                    api.alsa.period-size = 128
    ...

For wireplumber:

    /etc/wireplumber/wireplumber.conf.d/update-rate-and-format.conf (or ~/.config/wireplumber/wireplumber.conf.d/update-rate-and-format.conf)

    monitor.alsa.rules = [
      {
        matches = [
          {
            node.name = "alsa_output.name-of-node"
          }
        ]
        actions = {
          update-props = {
            audio.format = "S24_3LE"
            audio.rate = 96000
            # Following value should be doubled until audio does not cut out or other issues stop occurring
            api.alsa.period-size = 128
          }
        }
      }
    ]

`alsa_output.name-of-node` node can be obtained using `pw-top`.

Your DAC might support a different format or sample rate. You can check what your DAC supports by querying ALSA:

First get the card number of your DAC:

    $ aplay -l

    ...
    card 3: S2 [Schiit Hel 2], device 0: USB Audio [USB Audio]
      Subdevices: 0/1
      Subdevice #0: subdevice #0
    ...

So in this example it would be card 3. Get all supported sample rates and formats:

    $ cat /proc/asound/cardX/streamX

    ...
    Playback:
      ...
      Interface 1
        Altset 1
        Format: S16_LE
        Channels: 2
        Endpoint: 0x05 (5 OUT) (ASYNC)
        Rates: 44100, 48000, 88200, 96000, 176400, 192000, 352800, 384000
        Data packet interval: 125 us
        Bits: 16
        ...
      Interface 1
        Altset 2
        Format: S24_3LE
        Channels: 2
        Endpoint: 0x05 (5 OUT) (ASYNC)
        Rates: 44100, 48000, 88200, 96000, 176400, 192000, 352800, 384000
        Data packet interval: 125 us
        Bits: 24
        ...
      Interface 1
        Altset 3
        Format: S32_LE
        Channels: 2
        Endpoint: 0x05 (5 OUT) (ASYNC)
        Rates: 44100, 48000, 88200, 96000, 176400, 192000, 352800, 384000
        Data packet interval: 125 us
        Bits: 32
        ...
    ...

In this case `S16_LE, S24_3LE, S32_LE` are the supported formats and `44100, 48000, 88200, 96000, 176400, 192000, 352800, 384000` are the supported sample rates across all formats.

#### No sound from USB DAC until 30% volume

Some USB DACs will have no sound output until a certain level of volume is reached [6]. Typically this is around 25% - 30% which then leads to an uncomfortably loud initial volume and the inability to maintain a low volume. The solution is to ignore hardware mixer volume control by setting `api.alsa.soft-mixer` to `true`.

To achieve this with wireplumber use:

    /etc/wireplumber/wireplumber.conf.d/alsa-soft-mixer.conf (or ~/.config/wireplumber/wireplumber.conf.d/alsa-soft-mixer.conf)

    monitor.alsa.rules = [
      {
        matches = [
          {
            device.name = "~alsa_card.*"
          }
        ]
        actions = {
          update-props = {
            # Do not use the hardware mixer for volume control. It
            # will only use software volume. The mixer is still used
            # to mute unused paths based on the selected port.
            api.alsa.soft-mixer = true
          }
        }
      }
    ]

Then, restart pipewire. Set your master volume in `alsamixer` and then save the settings by running `alsactl store` as root. You should now be able to use your volume mixer as normal.

#### Realtime audio does not work

If `RTKit error: org.freedesktop.DBus.Error.AccessDenied` shows up in the status of the `pipewire.service` user unit, then the priority of the pipewire daemon was not changed to realtime. See [7] for this issue.

#### Simultaneous output to multiple sinks on the same sound card

Create a copy of `/usr/share/alsa-card-profile/mixer/profile-sets/default.conf` so that changes persist across updates. Here we define a profile joining the two default mappings for Analog and HDMI.

    /usr/share/alsa-card-profile/mixer/profile-sets/multiple.conf

    [General]
    auto-profiles = no

    [Mapping analog-stereo]
    device-strings = front:%f
    channel-map = left,right
    paths-output = analog-output analog-output-lineout analog-output-speaker analog-output-headphones analog-output-headphones-2
    paths-input = analog-input-front-mic analog-input-rear-mic analog-input-internal-mic analog-input-dock-mic analog-input analog-input-mic analog-input-linein analog-input-aux analog-input-video analog-input-tvtuner analog-input-fm analog-input-mic-line analog-input-headphone-mic analog-input-headset-mic
    priority = 15

    [Mapping hdmi-stereo]
    description = Digital Stereo (HDMI)
    device-strings = hdmi:%f
    paths-output = hdmi-output-0
    channel-map = left,right
    priority = 9
    direction = output

    [Profile multiple]
    description = Analog Stereo Duplex + Digital Stereo (HDMI) Output
    output-mappings = analog-stereo hdmi-stereo
    input-mappings = analog-stereo

Then configure your session manager to use the new card-profile for matching devices. Identifying information can be found using `pw-dump` or wpctl.

For wireplumber:

    /etc/wireplumber/wireplumber.conf.d/alsa-custom.conf (or ~/.config/wireplumber/wireplumber.conf.d/alsa-custom.conf)

    monitor.alsa.rules = [
      {
        matches = [
          {
            device.nick = "HDA Intel PCH"
          }
        ]
        actions = {
          update-props = {
            api.alsa.use-acp = true
            api.acp.auto-profile = false
            api.acp.auto-port = false
            device.profile-set = "multiple.conf"
            device.profile = "multiple"
          }
        }
      }
    ]

For pipewire-media-session:

    /etc/pipewire/media-session.d/alsa-monitor.conf (or ~/.config/pipewire/media-session.d/alsa-monitor.conf)

    rules = [
        {
            matches = [ { alsa.card_name = "HDA Intel PCH" } ]
            actions = {
                update-props = {
                    api.alsa.use-acp = true
                    device.profile-set = "multiple.conf"
                    device.profile = "multiple"
                    api.acp.auto-profile = false
                    api.acp.auto-port = false
                }
            }
        }
    ]

#### No notification sounds from Discord

This might cause by having the min.quantum too low, try setting it to more than 700. You can make an override for Discord specifically by appending the following rule to the pulse.rules section of pipewire-pulse.conf.

    /etc/pipewire/pipewire-pulse.conf (or ~/.config/pipewire/pipewire-pulse.conf)

    ...
    pulse.rules = [
      ...
        {
            # Discord notification sounds fix
            matches = [ { application.process.binary = "Discord" } ]
            actions = {
                update-props = {
                    pulse.min.quantum      = 1024/48000     # 21ms
                }
            }
        }
    ...

#### FMOD games crashing under PipeWire

Some games that use an old version of the FMOD audio engine, like Pillars of Eternity, invoke `pulseaudio --check` and crash if the PulseAudio binary is not present. A workaround is to symlink `/bin/pulseaudio` to `/bin/true`.[8]

    # ln -s /bin/true /bin/pulseaudio

Note that if you wish to reinstall PulseAudio, you need to remove the symlink.

#### Auto-switching is not working

If auto-switching is not working it may be an issue with WirePlumber state. As suggested by this comment you can delete WirePlumber's local state and restart the daemon to see if that helps:

    $ rm -r ~/.local/state/wireplumber/

Then restart the `wireplumber.service` user unit.

#### Missing realtime priority/crackling under load after suspend

Due to a bug from 2011 in rtkit, suspend events cause PipeWire's realtime priority to be revoked and not restored. To disable the protection which causes this, edit `rtkit-daemon.service`:

    /etc/systemd/system/rtkit-daemon.service.d/override.conf

    [Service]
    ExecStart=
    ExecStart=/usr/lib/rtkit-daemon --no-canary

Then restart the `rtkit-daemon.service` unit and `pipewire.service` user unit, along with the media session service.

#### No sound during streaming to RAOP devices (Sonos etc.)

Set up mDNS hostname resolution using either Avahi or systemd-resolved.

#### No sound devices show up in KDE Plasma

PipeWire clients (including the desktop environment) may rely on the XDG_RUNTIME_DIR environment variable to connect to the PipeWire daemon. [9] If you experience no sound devices immediately after login, it may be because this variable has manually been set to the wrong path.

Although this be resolved by manually restarting PipeWire, other issues can still occur such as being unable to screen share in Chromium (with `pipewire context failed`). `XDG_RUNTIME_DIR` is automatically set by pam_systemd(8), so you should remove any instances of it being set in your initialization files.

#### Device volume for SDDM and LightDM users is not restored on login

If you use SDDM or LightDM and notice that your audio volume level is not properly restored after logging in, mask PipeWire for the display manager's user, since WirePlumber running under the display manager can interfere with your user's WirePlumber session.

    # systemctl --user -M user@ mask pipewire.socket

Replace `user` with `sddm` for SDDM or `lightdm` for LightDM.

For more details, see this Debian Wiki article.

#### Terminal bell not working

From PipeWire's perspective, one must have the module x11.bell loaded. This shall be the configuration default (see also in config files mentioned above). Check if you have package pipewire-x11-bell installed. Also, your window manager might influence the terminal bell, e.g., for xfwm, check in the xfwm-terminal settings that "Audible bell" is activated. Now, restart pipewire service:

    $ systemctl --user restart pipewire

You can try if the terminal bell works with:

    $ echo $'\a'

#### No sound until after first playback attempt

When PipeWire is started using socket activation, some PipeWire-native applications may attempt to play audio before WirePlumber configures the nodes, resulting in an error, for example:

    $ mpv -v /path/to/file

    [ao/pipewire] PipeWire does not have any audio sinks, skipping
    [ao] Failed to initialize audio driver 'pipewire'

    $ journalctl --user -u mpd.service

    output: Failed to play on "PipeWire" (pipewire): no target node available
    exception: Failed to open audio output

As a workaround, you can enable the `pipewire.service` user unit.

### Video

#### OBS (etc.) display nothing, even if they ask for a window/screen

If you are sure that you have xdg-desktop-portal installed as well as either xdg-desktop-portal-gtk or xdg-desktop-portal-kde, check the running state of the daemons.

In OBS, if everything is working, you should see this in `stdout`:

    ...
    info: [pipewire] desktop selected, setting up screencast
    info: [pipewire] created stream 0x5632d7456850
    info: [pipewire] playing stream…

For multi-monitor setups the slurp package will allow to capture of all the screens.

## See also

- Wiki — PipeWire Wiki on Freedesktop GitLab
- Pipewire Update Blog Post — Blog post from January 2018 outlining the state of PipeWire at the time
- PipeWire Late Summer Update 2020 — Blog post from September 2020

Category:

- Multimedia

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