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  1. Qt
  2. QTBUG-140183

[QVideoFrame] The setMirrored and setRotation methods on QVideoFrame aren’t working as expected.

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    • Icon: Bug Bug
    • Resolution: Unresolved
    • Icon: P2: Important P2: Important
    • None
    • 6.8.3, 6.10.0 Beta2
    • Multimedia
    • None
    • macOS, Windows

      In Qt 6.8.3, the setMirrored() and setRotation() methods in QVideoFrame don’t work as expected.

      • setRotation() only rotates the canvas (the display area), but doesn’t actually rotate the original video data.
      • setMirrored() does nothing at all — no mirror effect is applied.

       
      These features worked fine in Qt 6.5.3.

      I tested this using Qt’s Camera example, and the issue still persists，The difference is clearly visible in the attached screenshots.

      To verify this issue, you can replace the line
      {{}}

      m_captureSession.setVideoOutput(ui->viewfinder)

      {{}}
      in the Camera example’s setCamera() method with the following code:

       

      auto videoSink = ui->viewfinder->videoSink();
if (videoSink) {
    connect(videoSink, &QVideoSink::videoFrameChanged, [=](const QVideoFrame& videoFrame) {
        auto frame = videoFrame;
        frame.setMirrored(true);  
#if QT_VERSION >= QT_VERSION_CHECK(6, 8, 3)
        frame.setRotation(QtVideo::Rotation::Clockwise90);
#else
        frame.setRotationAngle(QVideoFrame::Rotation90);  
#endif
        videoSink->setVideoFrame(frame);
    });
    m_captureSession.setVideoSink(videoSink);
}
// m_captureSession.setVideoOutput(ui->viewfinder);

       

        1. 6.5.3.png
          6.5.3.png
          207 kB
        2. 6.8.3.png
          6.8.3.png
          241 kB
        3. origin.png
          origin.png
          141 kB
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            qtmultimediateam Qt Multimedia Team
            box zhang weihai
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              Updated:

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