Question

大家好，我正在研究PyQt5，对此我是全新的！我正在尝试制作一个小的应用程序来浏览视频文件，在屏幕上显示它，并从视频中获取帧，以便我可以对其进行处理。到目前为止，我已经按照互联网上的说明进行了前两件事（您可以快速浏览下面的代码），但是我不知道如何获得框架。有人可以告诉我如何从pyqt5中获取框架吗？非常感激！这是我的代码：

from PyQt5.QtCore import QDir, QSize, QSizeF, Qt, QUrl
from PyQt5.QtGui import QTransform
from PyQt5.QtMultimedia import QMediaContent, QMediaPlayer
from PyQt5.QtMultimediaWidgets import QGraphicsVideoItem
from PyQt5.QtWidgets import (QApplication, QFileDialog, QGraphicsScene,
    QGraphicsView, QHBoxLayout, QPushButton, QSlider, QStyle, QVBoxLayout,
    QWidget)


class VideoPlayer(QWidget):

def __init__(self, parent=None):
    super(VideoPlayer, self).__init__(parent)

    self.mediaPlayer = QMediaPlayer(None, QMediaPlayer.VideoSurface)

    self.videoItem = QGraphicsVideoItem()
    self.videoItem.setSize(QSizeF(640, 480))

    scene = QGraphicsScene(self)
    graphicsView = QGraphicsView(scene)

    scene.addItem(self.videoItem)

    rotateSlider = QSlider(Qt.Horizontal)
    rotateSlider.setRange(-180,  180)
    rotateSlider.setValue(0)
    rotateSlider.valueChanged.connect(self.rotateVideo)

    openButton = QPushButton("Open...")
    openButton.clicked.connect(self.openFile)

    self.playButton = QPushButton()
    self.playButton.setEnabled(False)
    self.playButton.setIcon(self.style().standardIcon(QStyle.SP_MediaPlay))
    self.playButton.clicked.connect(self.play)

    self.positionSlider = QSlider(Qt.Horizontal)
    self.positionSlider.setRange(0, 0)
    self.positionSlider.sliderMoved.connect(self.setPosition)

    controlLayout = QHBoxLayout()
    controlLayout.setContentsMargins(0, 0, 0, 0)
    controlLayout.addWidget(openButton)
    controlLayout.addWidget(self.playButton)
    controlLayout.addWidget(self.positionSlider)

    layout = QVBoxLayout()
    layout.addWidget(graphicsView)
    layout.addWidget(rotateSlider)
    layout.addLayout(controlLayout)

    self.setLayout(layout)

    self.mediaPlayer.setVideoOutput(self.videoItem)
    self.mediaPlayer.stateChanged.connect(self.mediaStateChanged)
    self.mediaPlayer.positionChanged.connect(self.positionChanged)
    self.mediaPlayer.durationChanged.connect(self.durationChanged)

def sizeHint(self):
    return QSize(800, 600)

def openFile(self):
    fileName, _ = QFileDialog.getOpenFileName(self, "Open Movie",
            QDir.homePath())

    if fileName != '':
        self.mediaPlayer.setMedia(
                QMediaContent(QUrl.fromLocalFile(fileName)))
        self.playButton.setEnabled(True)

def play(self):
    if self.mediaPlayer.state() == QMediaPlayer.PlayingState:
        self.mediaPlayer.pause()
    else:
        self.mediaPlayer.play()

def mediaStateChanged(self, state):
    if self.mediaPlayer.state() == QMediaPlayer.PlayingState:
        self.playButton.setIcon(
                self.style().standardIcon(QStyle.SP_MediaPause))
    else:
        self.playButton.setIcon(
                self.style().standardIcon(QStyle.SP_MediaPlay))

def positionChanged(self, position):
    self.positionSlider.setValue(position)

def durationChanged(self, duration):
    self.positionSlider.setRange(0, duration)

def setPosition(self, position):
    self.mediaPlayer.setPosition(position)

def rotateVideo(self, angle):
    x = self.videoItem.boundingRect().width() / 2.0
    y = self.videoItem.boundingRect().height() / 2.0

    self.videoItem.setTransform(
            QTransform().translate(x, y).rotate(angle).translate(-x, -y))


if __name__ == '__main__':

import sys

app = QApplication(sys.argv)

player = VideoPlayer()
player.show()

sys.exit(app.exec_())

PyQt5：如何从视频中获取帧？

0 个答案: