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  1. Qt
  2. QTBUG-86005

QCamera::start() takes longer time when launching the app from Qt Creator

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    • macOS

      When camera streaming starts, it takes much longer in Qt creator
      than when the application is launched from Finder.
      And the application shows the following output. 

      Failed to start viewfinder m_surface, format: QVideoSurfaceFormat(Format_UYVY, QSize(1280, 720), viewport=QRect(0,0 1280x720), pixelAspectRatio=QSize(1, 1), handleType=NoHandle, yCbCrColorSpace=YCbCr_Undefined)
handleType = QVariant(QAbstractVideoBuffer::HandleType, )
pixelFormat = QVariant(QVideoFrame::PixelFormat, )
frameSize = QVariant(QSize, QSize(1280, 720))
frameWidth = QVariant(int, 1280)
viewport = QVariant(QRect, QRect(0,0 1280x720))
scanLineDirection = QVariant(QVideoSurfaceFormat::Direction, )
frameRate = QVariant(double, 0)
pixelAspectRatio = QVariant(QSize, QSize(1, 1))
sizeHint = QVariant(QSize, QSize(1280, 720))
yCbCrColorSpace = QVariant(QVideoSurfaceFormat::YCbCrColorSpace, )
mirrored = QVariant(bool, false)

      How to reproduce
      1. Use the attached example (Qtbug86005.zip)
      2. Click "Stream" to start camera streaming

      Expected behavior
      The viewfinder is shown instantly

      Actual behavior
      It takes more than 5 seconds

        1. Qtbug86005.zip
          43 kB
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            valentyn.doroshchuk Valentyn Doroshchuk
            nagrohn Nahomi Gröhn (Inactive)
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              Created:
              Updated:
              Resolved:

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