【发布时间】：2017-01-11 04:42:29
【问题描述】：
我正在尝试加载一个 mat 文件（具有被跟踪对象的位置坐标）并加载一个视频文件。要加载视频文件，我使用的是 opencv。我制作了一个 GUI 来加载它们。只要有人按下开始按钮，视频就会开始播放，暂停就会停止。
这里是它的 gui：
这是我遇到的两个问题：
- 视频被加载到不同的窗口中。我希望它出现在具有“开始”和“暂停”按钮的主窗口
- 我想添加 2 个按钮（“下一帧”和“上一帧”），让我可以逐帧浏览视频。下一帧按钮移至下一帧，上一帧将视频移至上一帧。
代码如下：
import sys
import scipy.io as sio
from PyQt4 import QtGui, QtCore
import cv2
class QtCapture(QtGui.QWidget):
def __init__(self, filename):
super(QtGui.QWidget, self).__init__()
self.cap = cv2.VideoCapture(str(filename))
self.video_frame = QtGui.QLabel()
lay = QtGui.QVBoxLayout()
lay.setMargin(0)
lay.addWidget(self.video_frame)
self.setLayout(lay)
def nextFrameSlot(self):
ret, frame = self.cap.read()
# My webcam yields frames in BGR format
frame = cv2.cvtColor(frame, cv2.cv.CV_BGR2RGB)
img = QtGui.QImage(frame, frame.shape[1], frame.shape[0], QtGui.QImage.Format_RGB888)
pix = QtGui.QPixmap.fromImage(img)
self.video_frame.setPixmap(pix)
def start(self):
self.timer = QtCore.QTimer()
self.timer.timeout.connect(self.nextFrameSlot)
self.timer.start(1000./30)
def pause(self):
self.timer.stop()
def deleteLater(self):
self.cap.release()
super(QtGui.QWidget, self).deleteLater()
class ControlWindow(QtGui.QMainWindow):
def __init__(self):
super(ControlWindow, self).__init__()
self.setGeometry(50, 50, 800, 600)
self.setWindowTitle("PyTrack")
self.capture = None
self.matPosFileName = None
self.videoFileName = None
self.positionData = None
self.updatedPositionData = {'red_x':[], 'red_y':[], 'green_x':[], 'green_y': [], 'distance': []}
self.updatedMatPosFileName = None
self.isVideoFileLoaded = False
self.isPositionFileLoaded = False
self.quitAction = QtGui.QAction("&Exit", self)
self.quitAction.setShortcut("Ctrl+Q")
self.quitAction.setStatusTip('Close The App')
self.quitAction.triggered.connect(self.closeApplication)
self.openMatFile = QtGui.QAction("&Open Position File", self)
self.openMatFile.setShortcut("Ctrl+Shift+T")
self.openMatFile.setStatusTip('Open .mat File')
self.openMatFile.triggered.connect(self.loadPosMatFile)
self.openVideoFile = QtGui.QAction("&Open Video File", self)
self.openVideoFile.setShortcut("Ctrl+Shift+V")
self.openVideoFile.setStatusTip('Open .h264 File')
self.openVideoFile.triggered.connect(self.loadVideoFile)
self.mainMenu = self.menuBar()
self.fileMenu = self.mainMenu.addMenu('&File')
self.fileMenu.addAction(self.openMatFile)
self.fileMenu.addAction(self.openVideoFile)
self.fileMenu.addAction(self.quitAction)
self.imageCaptureWindow = QtGui.QWidget(self)
self.start_button = QtGui.QPushButton('Start', self.imageCaptureWindow)
self.start_button.clicked.connect(self.startCapture)
self.start_button.setGeometry(0,10,40,30)
self.pause_button = QtGui.QPushButton('Pause', self.imageCaptureWindow)
self.pause_button.setGeometry(50,10,40,30)
self.setCentralWidget(self.imageCaptureWindow)
self.show()
def startCapture(self):
if not self.capture and self.isPositionFileLoaded and self.isVideoFileLoaded:
self.capture = QtCapture(self.videoFileName)
self.pause_button.clicked.connect(self.capture.pause)
self.capture.setParent(self)
self.capture.setWindowFlags(QtCore.Qt.Tool)
self.capture.start()
self.capture.show()
def endCapture(self):
self.capture.deleteLater()
self.capture = None
def loadPosMatFile(self):
try:
self.matPosFileName = str(QtGui.QFileDialog.getOpenFileName(self, 'Select .mat position File'))
self.positionData = sio.loadmat(self.matPosFileName)
self.isPositionFileLoaded = True
except:
print "Please select a .mat file"
def loadVideoFile(self):
try:
self.videoFileName = QtGui.QFileDialog.getOpenFileName(self, 'Select .h264 Video File')
self.isVideoFileLoaded = True
except:
print "Please select a .h264 file"
def closeApplication(self):
choice = QtGui.QMessageBox.question(self, 'Message','Do you really want to exit?',QtGui.QMessageBox.Yes | QtGui.QMessageBox.No)
if choice == QtGui.QMessageBox.Yes:
print("Closing....")
sys.exit()
else:
pass
if __name__ == '__main__':
import sys
app = QtGui.QApplication(sys.argv)
window = ControlWindow()
sys.exit(app.exec_())
我该怎么做呢？感谢您的帮助！
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