---
title: Advanced Settings
weight: 49
---

## Privilege Levels for Settings

There are four types of settings:

1. Override settings, in "Web Console → Custom Clients"
2. Default settings, in "Web Console → Custom Clients"
3. User settings, in the RustDesk client
4. Strategy settings, in "Web Console → Strategies"

The hierarchy of privilege for these settings is as follows: `Override > Strategy > User > Default`.

## Security Settings

### access-mode

Set the access mode (permissions) for incoming connections.

**Location**:

1. **Desktop** Settings → Security → Permissions
2. **Mobile**

| Install required | Values | Default | Example |
| :------: | :------: | :------: | :------: |
| N | custom, full, view | custom | `access-mode=custom` |

### enable-keyboard

Enable keyboard/mouse input for incoming connections.

**Location**:

1. **Desktop** Settings → Security → Permissions → Enable keyboard
2. **Mobile**

| Install required | Values | Default | Example |
| :------: | :------: | :------: | :------: |
| N | Y, N | Y | `enable-keyboard=Y` |

### enable-clipboard

Enable copy and paste for the incoming connections.

**Location**:

1. **Desktop** Settings → Security → Permissions → Enable clipboard
2. **Mobile**

| Install required | Values | Default | Example |
| :------: | :------: | :------: | :------: |
| N | Y, N | Y | `enable-clipboard=Y` |

### enable-file-transfer

Enable file copy and paste or file transfer (session) for incoming connections.

**Location**:

1. **Desktop** Settings → Security → Permissions → Enable file transfer
2. **Mobile**

| Install required | Values | Default | Example |
| :------: | :------: | :------: | :------: |
| N | Y, N | Y | `enable-file-transfer=Y` |

### enable-audio

Enable audio record and transfer to peer.

**Location**:

1. **Desktop** Settings → Security → Permissions → Enable audio
2. **Mobile**

| Install required | Values | Default | Example |
| :------: | :------: | :------: | :------: |
| N | Y, N | Y | `enable-audio=Y` |

### enable-tunnel

Enable TCP tunneling.

**Location**:

1. **Desktop** Settings → Security → Permissions → Enable TCP tunneling
2. **Mobile**

| Install required | Values | Default | Example |
| :------: | :------: | :------: | :------: |
| N | Y, N | Y | `enable-tunnel=Y` |

### enable-remote-restart

Enable restarting by the control side.

**Location**:

1. **Desktop** Settings → Security → Permissions → Enable remote restart
2. **Mobile**

| Install required | Values | Default | Example |
| :------: | :------: | :------: | :------: |
| N | Y, N | Y | `enable-remote-restart=Y` |

### enable-record-session

Enable sessions to be recorded.

**Location**:

1. **Desktop** Settings → Security → Permissions → Enable recording session
2. **Mobile** Settings → Share screen → Enable recording session

| Install required | Values | Default | Example |
| :------: | :------: | :------: | :------: |
| N | Y, N | Y | `enable-record-session=Y` |

### enable-block-input

Enable the control side to block other users' input.

**Location**:

1. **Desktop** Settings → Security → Permissions → Enable blocking user input (Windows only)
2. **Mobile**

| Install required | Values | Default | Example |
| :------: | :------: | :------: | :------: |
| N | Y, N | Y | `enable-block-input=Y` |

### allow-remote-config-modification

Allow the control side to change the settings in controlled RustDesk UI.

**Location**:

1. **Desktop** Settings → Security → Permissions → Enable remote configuration modification
2. **Mobile**

| Install required | Values | Default | Example |
| :------: | :------: | :------: | :------: |
| N | Y, N | Y | `allow-remote-config-modification=Y` |

### enable-lan-discovery

Allows LAN peers to discover me.

After LAN discovery, [WOL](https://en.wikipedia.org/wiki/Wake-on-LAN) can work if supported locally.

**Location**:

1. **Desktop** Settings → Security → Security → Deny LAN discovery
2. **Mobile** Settings → Share screen → Deny LAN discovery

| Install required | Values | Default | Example |
| :------: | :------: | :------: | :------: |
| Y | Y, N | Y | `enable-lan-discovery=Y` |

### direct-server

Enable direct IP access.

**Location**:

1. **Desktop** Settings → Security → Security → Enable direct IP access
2. **Mobile** Settings → Share screen → Direct IP access

| Install required | Values | Default | Example |
| :------: | :------: | :------: | :------: |
| N | Y, N | N | `direct-server=Y` |

### direct-access-port

Direct IP access port.

**Location**:

1. **Desktop** Settings → Security → Security → Direct IP access port (Show if "Enable direct IP access" is checked)
2. **Mobile** Settings → Share screen → Direct IP access

| Install required | Values | Default | Example |
| :------: | :------: | :------: | :------: |
| N |  | 21118 | `direct-access-port=21118` |

### whitelist

Use IP Whitelisting.

**Location**:

1. **Desktop** Settings → Security → Security → Use IP Whitelisting
2. **Mobile** Settings → Share screen → Use IP Whitelisting

| Install required | Values | Default | Example |
| :------: | :------: | :------: | :------: |
| N | `,` or `<ip1>,<ip2>,<ip3>` | `,` means no filter | `whitelist=,` |

### allow-auto-disconnect & auto-disconnect-timeout

Automatically close incoming sessions after a period of user inactivity.

**Location**:

1. **Desktop** Settings → Security → Security → Automatically close incoming sessions on user inactivity
2. **Mobile** Settings → Share screen → Automatically close incoming sessions on user inactivity

| Option | Install required | Values | Default | Example |
| :------: | :------: | :------: | :------: | :------: |
| allow-auto-disconnect | N | Y, N | N | `allow-auto-disconnect=Y` |
| auto-disconnect-timeout | N | Timeout in minutes | 10 | `auto-disconnect-timeout=10` |

### allow-only-conn-window-open

Only allow connection if RustDesk window is open.

**Location**:

1. **Desktop** Settings → Security → Security → Only allow connection if RustDesk window is open
2. **Mobile**

| Install required | Values | Default | Example |
| :------: | :------: | :------: | :------: |
| Y | Y, N | N | `allow-only-conn-window-open=N` |

### approve-mode

Accept incoming connections via password or manually click.

**Location**:

1. **Desktop** Settings → Security → Password → Dropdown box
2. **Mobile** Share screen → Dropdown menu on right-up corner

| Install required | Values | Default | Example |
| :------: | :------: | :------: | :------: |
| N | password, click, password-click | password-click | `approve-mode=password-click` |

### proxy-url

The proxy URL.

Currently support `http` and `socks5`.

**Location**:

1. **Desktop** Settings → Network → Proxy → Socks5/Http(s) proxy
2. **Mobile**

Examples:

1. **http** `proxy-url=http://192.168.0.2:12345`
2. **https** `proxy-url=https://192.168.0.2:12345`
3. **socks5** `proxy-url=socks5://192.168.0.2:1080`

### proxy-username & proxy-password

Proxy username and password.

**Location**:

1. **Desktop** Settings → Network → Proxy → Socks5/Http(s) proxy
2. **Mobile**

| Option | Install required | Values | Default | Example |
| :------: | :------: | :------: | :------: | :------: |
| proxy-username | N | | | `proxy-username=user` |
| proxy-password | N | | | `proxy-password=pass` |

## General Settings

### theme

Controls the UI theme of RustDesk client.

**Location**:

1. **Desktop** Settings → General → Theme
2. **Mobile** Settings → Settings → Theme

| Install required | Values | Default | Example |
| :------: | :------: | :------: | :------: |
| N | dark, light, system | system | `theme=system` |

### lang

Controls the language of RustDesk client.

**Location**:

1. **Desktop** Settings → General → Language
2. **Mobile** Settings → Settings → Language

| Install required | Values | Default | Example |
| :------: | :------: | :------: | :------: |
| N | default, ar, bg, ... | default | `lang=default` |

Currently available languages are:

ar, bg, ca, cs, da, de, el, en, eo, es, et, fa, fr, he, hr, hu, id, it, ja, ko, kz, lt, lv, nb, nl, pl, pt, ro, ru, sk, sl, sq, sr, sv, th, tr, ua, vn, zh-cn, zh-tw

You can check [LANGS](https://github.com/rustdesk/rustdesk/blob/master/src/lang.rs#L45) in the code for the latest language list.

### allow-auto-record-incoming

Automatically record incoming sessions.

**Location**:

1. **Desktop** Settings → General → Recording → Automatically record incoming sessions
2. **Mobile** Settings → Recording → Automatically record incoming sessions

| Install required | Values | Default | Example |
| :------: | :------: | :------: | :------: |
| N | Y, N | N | `allow-auto-record-incoming=N` |

### video-save-directory

The directory to save recorded videos.

**Location**:

1. **Desktop** Settings → General → Recording → Video save directory
2. **Mobile** Settings → Recording

Default values:

1. **MacOS** ~/Movies/**app_name**
2. **Linux** ~/Videos/**app_name**
3. **Windows** %USERPROFILE%\Videos\\**app_name**
4. **Android** /Storage/emulated/0/**app_name**/ScreenRecord

**Note**: Replace **app_name** means current app name.

### enable-confirm-closing-tabs

Controls whether to show a confirm dialog before closing all remote tabs.

**Location**:

1. **Desktop** Settings → General → Other → Confirm before closing multiple tabs
2. **Mobile**

| Install required | Values | Default | Example |
| :------: | :------: | :------: | :------: |
| N | Y, N | Y | `enable-confirm-closing-tabs=Y` |

### enable-abr

Enable adaptive bitrate.

**Location**:

1. **Desktop** Settings → General → Other → Adaptive bitrate
2. **Mobile** Settings → Share screen → Adaptive bitrate (beta)

| Install required | Values | Default | Example |
| :------: | :------: | :------: | :------: |
| N | Y, N | Y | `enable-abr=Y` |

### allow-remove-wallpaper

Remove wallpaper during incoming sessions.

**Location**:

1. **Desktop** Settings → General → Other → Remove wallpaper during incoming sessions
2. **Mobile**

| Install required | Values | Default | Example |
| :------: | :------: | :------: | :------: |
| N | Y, N | N | `allow-remove-wallpaper=N` |

### enable-open-new-connections-in-tabs

Controls whether to use a new tab or a new window to open a new connection.

**Location**:

1. **Desktop** Settings → General → Other → Open connection in new tab
2. **Mobile**

| Install required | Values | Default | Example |
| :------: | :------: | :------: | :------: |
| N | Y, N | Y | `enable-open-new-connections-in-tabs=Y` |

### allow-always-software-render

Always use software rendering.

**Location**:

1. **Desktop** Settings → General → Other → Always use software rendering
2. **Mobile**

| Install required | Values | Default | Example |
| :------: | :------: | :------: | :------: |
| N | Y, N | N | `allow-always-software-render=N` |

### allow-linux-headless

Allow incoming connection if there's no displays.

This option requires desktop environment, Xorg server and GDM, see [PR 3902](https://github.com/rustdesk/rustdesk/pull/3902).

**Location**:

1. **Desktop** Settings → General → Other → Allow Linux headless
2. **Mobile**

| Install required | Values | Default | Example |
| :------: | :------: | :------: | :------: |
| Y | Y, N | N | `allow-linux-headless=N` |

### enable-hwcodec

Enable hardware encoding to make the picture smoother.

**Location**:

1. **Desktop**
2. **Mobile** Settings → Hardware codec

| Install required | Values | Default | Example |
| :------: | :------: | :------: | :------: |
| N | Y, N | Y | `enable-hwcodec=Y` |

### peer-card-ui-type

Controls the view of peer cards, includes "Big tiles", "Small tiles" and "List".

**Location**:

1. **Desktop** Home → Peer panel → Right top grid icon
2. **Mobile**

| Install required | Values | Default | Example |
| :------: | :------: | :------: | :------: |
| N | 0, 1, 2 | 0 | `peer-card-ui-type=0` |

**0** Big tiles  
**1** Small tiles  
**2** List

### peer-sorting

Controls the ordering of peer cards.

**Location**:

1. **Desktop** Home → Peer panel → Right top sort icon
2. **Mobile**

| Install required | Values | Default | Example |
| :------: | :------: | :------: | :------: |
| N | Remote ID, Remote Host, Username | Remote ID | `peer-sorting=Remote ID` |

### sync-ab-with-recent-sessions

Controls whether to sync the address book with recent sessions.

**Location**:

1. **Desktop** Home → Peer panel → Address book → Tags → Dropdown menu → Sync with recent sessions
2. **Mobile** Home → Peer panel → Address book → Tags → Dropdown menu → Sync with recent sessions

| Install required | Values | Default | Example |
| :------: | :------: | :------: | :------: |
| N | Y, N | N | `sync-ab-with-recent-sessions=N` |

### sync-ab-tags

Controls whether to sort the address book tags.

**Location**:

1. **Desktop** Home → Peer panel → Address book → Tags → Dropdown menu → Sort tags
2. **Mobile** Home → Peer panel → Address book → Tags → Dropdown menu → Sort tags

| Install required | Values | Default | Example |
| :------: | :------: | :------: | :------: |
| N | Y, N | N | `sync-ab-tags=N` |

### filter-ab-by-intersection

Filter address book by tag intersection.

**Preview**: [PR #5985](https://github.com/rustdesk/rustdesk/pull/5985)

**Location**:

1. **Desktop** Home → Peer panel → Address book → Tags → Dropdown menu → Filter by intersection
2. **Mobile** Home → Peer panel → Address book → Tags → Dropdown menu → Filter by intersection

| Install required | Values | Default | Example |
| :------: | :------: | :------: | :------: |
| N | Y, N | N | `filter-ab-by-intersection=N` |

## Display Settings

### view-only

This option will set the "view-only" option for every peer after the first connection.

Then the "view-only" option in each peer's settings will controls whether the connection is view-only.

**Location**:

1. **Desktop** Settings → Display → Other default options → View mode
2. **Mobile** Settings → Display settings → Other default options → View mode

| Install required | Values | Default | Example |
| :------: | :------: | :------: | :------: |
| N | Y, N | N | `view-only=Y` |

### show-monitors-toolbar

Controls whether to show monitors in toolbar.

![show-monitors-toolbar](/docs/en/self-host/client-configuration/advanced-settings/images/show-monitors-toolbar.png)

**Location**:

1. **Desktop** Settings → Display → Other default options → Show monitors toolbar
2. **Mobile**

| Install required | Values | Default | Example |
| :------: | :------: | :------: | :------: |
| N | Y, N | N | `show-monitors-toolbar=Y` |

### collapse-toolbar

Controls whether the remote toolbar is collapsed after connecting.

**Location**:

1. **Desktop** Settings → Display → Other default options → Collapse toolbar
2. **Mobile**

| Install required | Values | Default | Example |
| :------: | :------: | :------: | :------: |
| N | Y, N | N | `collapse-toolbar=Y` |

### show-remote-cursor

This option will set the "show-remote-cursor" option for every peer after the first connection.

Then the "show-remote-cursor" option in each peer's settings will controls whether the remote cursor is displayed in the remote control page.

**Location**:

1. **Desktop** Settings → Display → Other default options → Show remote cursor
2. **Mobile** Settings → Display settings → Other default options → Show remote cursor

| Install required | Values | Default | Example |
| :------: | :------: | :------: | :------: |
| N | Y, N | N | `show-remote-cursor=N` |

### follow-remote-cursor

This option will set the "follow-remote-cursor" option for every peer after the first connection.

Then the "follow-remote-cursor" option in each peer's settings will controls whether to follow the remote cursor.

**Preview** [PR 7717](https://github.com/rustdesk/rustdesk/pull/7717)

**Location**:

1. **Desktop** Settings → Display → Other default options → Follow remote cursor
2. **Mobile** Settings → Display settings → Other default options → Follow remote cursor

| Install required | Values | Default | Example |
| :------: | :------: | :------: | :------: |
| N | Y, N | N | `follow-remote-cursor=Y` |

### follow-remote-window

This option will set the "follow-remote-window" option for every peer after the first connection.

Then the "follow-remote-window" option in each peer's settings will controls whether to follow the remote window.

**Preview** [PR 7717](https://github.com/rustdesk/rustdesk/pull/7717)

**Location**:

1. **Desktop** Settings → Display → Other default options → Follow remote window focus
2. **Mobile** Settings → Display settings → Other default options → Follow remote window focus

| Install required | Values | Default | Example |
| :------: | :------: | :------: | :------: |
| N | Y, N | N | `follow-remote-window=Y` |

### zoom-cursor

This option will set the "zoom-cursor" option for every peer after the first connection.

The "zoom-cursor" option in each peer's settings will then control whether the cursor is scaled based on the current image scale.

**Location**:

1. **Desktop** Settings → Display → Other default options → Zoom cursor
2. **Mobile**

| Install required | Values | Default | Example |
| :------: | :------: | :------: | :------: |
| N | Y, N | N | `zoom-cursor=Y` |

### show-quality-monitor

This option will set the "show-quality-monitor" option for every peer after the first connection.

The "show-quality-monitor" option in each peer's settings will then control whether to show the quality monitor.

**Location**:

1. **Desktop** Settings → Display → Other default options → Show quality monitor
2. **Mobile** Settings → Display settings → Other default options → Show quality monitor

| Install required | Values | Default | Example |
| :------: | :------: | :------: | :------: |
| N | Y, N | N | `show-quality-monitor=Y` |

### disable-audio

This option will set the "disable-audio" option for every peer after the first connection.

The "disable-audio" option in each peer's settings will then control whether to play sound.

**Location**:

1. **Desktop** Settings → Display → Other default options → Mute
2. **Mobile** Settings → Display settings → Other default options → Mute

| Install required | Values | Default | Example |
| :------: | :------: | :------: | :------: |
| N | Y, N | N | `disable-audio=Y` |

### enable-file-copy-paste

This option will set the "enable-file-copy-paste" option for every peer after the first connection.

The "enable-file-copy-paste" option in each peer's settings will then control enable file copy and paste in connection.

**Location**:

1. **Desktop** Settings → Display → Other default options → Enable file copy and paste (Windows only)
2. **Mobile**

| Install required | Values | Default | Example |
| :------: | :------: | :------: | :------: |
| N | Y, N | N | `enable-file-copy-paste=Y` |

### disable-clipboard

This option will set the "disable-clipboard" option for every peer after the first connection.

The "disable-clipboard" option in each peer's settings will then control whether to enable text copy and paste.

**Location**:

1. **Desktop** Settings → Display → Other default options → Disable clipboard
2. **Mobile** Settings → Display settings → Other default options → Disable clipboard

| Install required | Values | Default | Example |
| :------: | :------: | :------: | :------: |
| N | Y, N | N | `disable-clipboard=Y` |

### lock-after-session-end

This option will set the "lock-after-session-end" option for every peer after the first connection.

The "lock-after-session-end" option in each peer's settings will then control whether to lock the peer machine after the session ends.

**Location**:

1. **Desktop** Settings → Display → Other default options → Lock after session end
2. **Mobile** Settings → Display settings → Other default options → Lock after session end

| Install required | Values | Default | Example |
| :------: | :------: | :------: | :------: |
| N | Y, N | N | `lock-after-session-end=Y` |

### privacy-mode

This option will set the "privacy-mode" option for every peer after the first connection.

The "privacy-mode" option in each peer's settings will then control whether to use privacy mode after connecting.

**Location**:

1. **Desktop** Settings → Display → Other default options → Privacy mode
2. **Mobile** Settings → Display settings → Other default options → Privacy mode

| Install required | Values | Default | Example |
| :------: | :------: | :------: | :------: |
| N | Y, N | N | `privacy-mode=Y` |

### touch-mode

This option will set the "touch-mode" option for every peer after the first connection.

The "touch-mode" option in each peer's settings will then control whether to use touch mode or mouse mode.

**Location**:

1. **Desktop**
2. **Mobile** Settings → Display settings → Other default options → Touch mode

| Install required | Values | Default | Example |
| :------: | :------: | :------: | :------: |
| N | Y, N | N | `touch-mode=Y` |

### i444

This option will set the "i444" option for every peer after the first connection.

The "i444" option in each peer's settings will then control whether to use true color.

**Location**:

1. **Desktop** Settings → Display → Other default options → True color (4:4:4)
2. **Mobile** Settings → Display settings → Other default options → True color (4:4:4)

| Install required | Values | Default | Example |
| :------: | :------: | :------: | :------: |
| N | Y, N | N | `i444=Y` |

### reverse-mouse-wheel

This option will set the "reverse-mouse-wheel" option for every peer after the first connection.

The "reverse-mouse-wheel" option in each peer's settings will then control whether to reverse mouse wheel.

**Location**:

1. **Desktop** Settings → Display → Other default options → Reverse mouse wheel
2. **Mobile** Settings → Display settings → Other default options → Reverse mouse wheel

| Install required | Values | Default | Example |
| :------: | :------: | :------: | :------: |
| N | Y, N | N | `reverse-mouse-wheel=Y` |

### swap-left-right-mouse

This option will set the "swap-left-right-mouse" option for every peer after the first connection.

The "swap-left-right-mouse" option in each peer's settings will then control whether to swap left-right mouse button.

**Location**:

1. **Desktop** Settings → Display → Other default options → Swap left-right mouse button
2. **Mobile** Settings → Display settings → Other default options → Swap left-right mouse button

| Install required | Values | Default | Example |
| :------: | :------: | :------: | :------: |
| N | Y, N | N | `swap-left-right-mouse=Y` |

### displays-as-individual-windows

This option will set the "displays-as-individual-windows" option for every peer after the first connection.

The "displays-as-individual-windows" option in each peer's settings will then control whether to show displays as individual windows.

**Preview** [PR 5945](https://github.com/rustdesk/rustdesk/pull/5945)

**Location**:

1. **Desktop** Settings → Display → Other default options → Show displays as individual windows
2. **Mobile**

| Install required | Values | Default | Example |
| :------: | :------: | :------: | :------: |
| N | Y, N | N | `displays-as-individual-windows=Y` |

### use-all-my-displays-for-the-remote_session

This option will set the "use-all-my-displays-for-the-remote_session" option for every peer after the first connection.

The "use-all-my-displays-for-the-remote_session" option in each peer's settings will then control whether to use all my displays for the remote session.

**Preview** [PR 6064](https://github.com/rustdesk/rustdesk/pull/6064)

**Location**:

1. **Desktop** Settings → Display → Other default options → Use all my displays for the remote session
2. **Mobile**

| Install required | Values | Default | Example |
| :------: | :------: | :------: | :------: |
| N | Y, N | N | `use-all-my-displays-for-the-remote_session=Y` |

### view-style

This option will set the "view-style" option for every peer after the first connection.

The "view-style" option in each peer's settings will then control the view style.

**Location**:

1. **Desktop** Settings → Display → Default view style
2. **Mobile** Settings → Display settings → Default view style

| Install required | Values | Default | Example |
| :------: | :------: | :------: | :------: |
| N | original, adaptive | original | `view-style=original` |

### scroll-style

This option will set the "scroll-style" option for every peer after the first connection.

The "scroll-style" option in each peer's settings will then control the scroll style.

**Location**:

1. **Desktop** Settings → Display → Default scroll style
2. **Mobile**

| Install required | Values | Default | Example |
| :------: | :------: | :------: | :------: |
| N | scrollauto, scrollbar | scrollauto | `scroll-style=scrollauto` |

### image-quality

This option will set the "image-quality" option for every peer after the first connection.

The "image-quality" option in each peer's settings will then control the image quality.

**Location**:

1. **Desktop** Settings → Display → Default image quality
2. **Mobile** Settings → Display settings → Default image quality

| Install required | Values | Default | Example |
| :------: | :------: | :------: | :------: |
| N | best, balanced, low, custom | balanced | `image-quality=balanced` |

### custom-image-quality

This option will set the "custom-image-quality" option for every peer after the first connection.

The "custom-image-quality" option in each peer's settings will then control the image quality if "image-quality" is set to custom.

**Location**:

1. **Desktop** Settings → Display → Default image quality → Custom
2. **Mobile** Settings → Display settings → Default image quality → Custom

| Install required | Values | Default | Example |
| :------: | :------: | :------: | :------: |
| N | [10.0, 2000.0] | 50.0 | `custom-image-quality=50` |

### custom-fps

This option will set the "custom-fps" option for every peer after the first connection.

The "custom-fps" option in each peer's settings will then control the fps if "image-quality" is set to custom.

**Location**:

1. **Desktop** Settings → Display → Default image quality → Custom
2. **Mobile** Settings → Display settings → Default image quality → Custom

| Install required | Values | Default | Example |
| :------: | :------: | :------: | :------: |
| N | [5, 120] | 30 | `custom-fps=30` |

### codec-preference

This option will set the "codec-preference" option for every peer after the first connection.

The "codec-preference" option in each peer's settings will then control codec for images.

**Location**:

1. **Desktop** Settings → Display → Default codec
2. **Mobile** Settings → Display settings → Default codec

| Install required | Values | Default | Example |
| :------: | :------: | :------: | :------: |
| N | auto, vp8, vp9, av1, h264, h265 | auto | `codec-preference=auto` |

**CAUTION**: Options other than "vp8" and "vp9" may not work. This depends on what your machine supports.