How to use scrollArea to view camera video in PyQt4



  • Hi
    I am new in Pyqt4, I design GUI in Qt and convert to pyqt4, now i want to use scroll Area to show camera view in the scroll area.
    this is my code to open camera in the new window.
    def init(self):
    self.capturing = False
    self.c = cv2.VideoCapture(0)

    def startCapture(self):
        print "pressed start"
        self.capturing = True
        cap = self.c
        while(self.capturing):
            ret, frame = cap.read()
            cv2.imshow("Capture", frame)
            cv2.waitKey(5)
        cv2.destroyAllWindows()
    

    Heare is my code to scrollArea design.
    self.scrollArea = QtGui.QScrollArea(self.centralWidget)
    self.scrollArea.setMouseTracking(True)
    self.scrollArea.setWidgetResizable(True)
    self.scrollArea.setObjectName(_fromUtf8("scrollArea"))
    self.scrollAreaWidgetContents = QtGui.QWidget()
    self.scrollAreaWidgetContents.setGeometry(QtCore.QRect(0, 0, 363, 214))
    self.scrollAreaWidgetContents.setObjectName(_fromUtf8("scrollAreaWidgetContents"))

        self.scrollArea.setWidget(self.scrollAreaWidgetContents)

  • Lifetime Qt Champion

    Hi,

    You are trying to mix two different GUI library here and that won't go as you expect even if OpenCV might use Qt as backend.

    You should rather convert the frames you capture to a QImage and use a QLabel to show them. Or you could consider using QtMultimedia if it fits your need, then there's no need for OpenCV.



  • @SGaist
    How can i use QtMultimedia in PyQt4.


  • Qt Champions 2017

    Hi
    Like any other Qt module,
    Something like

    import sys
    from PyQt5.QtWidgets import QApplication, QWidget
    from PyQt5.QtCore import QUrl
    from PyQt5 import QtMultimedia
    from qt_tools import key_text
    
    class Window(QWidget):
         def __init__(self):
             super().__init__()
             self.player = QtMultimedia.QMediaPlayer(self)
             self.player.setMedia(QUrl.fromLocalFile("xxxxx"))     
             self.show()
    
         def keyPressEvent(self, e):
             key = key_text(e.key())
             if key == "space":
                 print(self.player.errorString())
                 self.player.play()
    
    app = QApplication(sys.argv)
    window = Window()
    sys.exit(app.exec_())
    

    Note I do not use python :)
    Just used google to find sample.


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