QScreenCapture Class

Detailed Description

The class captures a screen. It is managed by the QMediaCaptureSession class where the captured screen can be displayed in a video preview object or recorded to a file.

 QMediaCaptureSession session;
 QAudioInput audioInput;
 session.setAudioInput(&input);
 QMediaRecorder recorder;
 session.setRecorder(&recorder);
 recorder.setQuality(QMediaRecorder::HighQuality);
 recorder.setOutputLocation(QUrl::fromLocalFile("test.mp3"));
 recorder.record();

Screen Capture Limitations

On Qt 6.5.2 and 6.5.3, the following limitations apply to using QScreenCapture:

• It is only supported with the FFmpeg backend.
• It is supported on all desktop platforms, except Linux with Wayland compositor, due to Wayland protocol restrictions and limitations.
• It is not supported on mobile operating systems, except on Android. There, you might run into performance issues as the class is currently implemented via QScreen::grabWindow, which is not optimal for the use case.
• On Linux, it works with X11, but it has not been tested on embedded.
• In most cases, we set a screen capture frame rate that equals the screen refresh rate, except on Windows, where the rate might be flexible. Such a frame rate (75/120 FPS) might cause performance issues on weak CPUs if the captured screen is of 4K resolution.