- Qt 6.11
- Qt Multimedia
- QML Types
- WindowCapture
- Qt 6.11.1 Reference Documentation

# WindowCapture QML Type

This type is used for capturing a window. More...

Import Statement: | `import QtMultimedia`
Since: | Qt 6.6
In C++: | QWindowCapture

- List of all members, including inherited members

## Properties

- active : bool
- error : enumeration
- errorString : string
- window : Window

## Methods

- list<CapturableWindow> capturableWindows()
- void start()
- void stop()

## Detailed Description

WindowCapture captures a window. It is managed by MediaCaptureSession where the captured window can be displayed in a video preview object or recorded to a file.

## Window Capture Limitations

The following limitations apply to using WindowCapture:

- WindowCapture is only supported with the FFmpeg backend.

The following limitations apply when using `QWindowCapture` on X11 systems:

- On Linux X11 systems, when a window is moved partially outside the visible screen area, only the visible region is captured. As a result, the emitted video frames may have a size smaller than the window’s geometry.
- Windows that are outside the visible screen area cannot be captured, and an error signal is emitted in that case.
- The behavior of minimized windows or those located on an invisible virtual workspace depends on the window manager. For example, such windows can be captured on GNOME, whereas on WindowMaker or Xfwm such capturing is not allowed, and the window capture instance emits an error.

See also CaptureSession and CapturableWindow.

## Property Documentation

### active : bool

Describes whether the capturing is currently active.

### error : enumeration `[read-only]`

Returns a code of the last error.

### errorString : string `[read-only]`

Returns a human readable string describing the cause of error.

### window : Window

Describes the window for capturing.

See also QtMultimedia::WindowCapture::capturableWindows.

## Method Documentation

### list<CapturableWindow> capturableWindows()

Returns a list of CapturableWindow objects that is available for capturing.

### void start()

Starts capturing the window.

This is equivalent to setting the active property to `true`.

### void stop()

Stops capturing.

This is equivalent to setting the active property to `false`.