pyqt5与ffmpeg组成视频播放器python代码

使用PyQt5和FFmpeg库可以方便地实现一个视频播放器的Python代码。下面给出一个简单的示例代码：

import sys
from PyQt5.QtWidgets import QApplication, QMainWindow, QWidget, QVBoxLayout, QPushButton, QLabel, QFileDialog
from PyQt5 import QtGui
import ffmpeg

class VideoPlayer(QMainWindow):
    def __init__(self):
        super().__init__()

        self.setWindowTitle('视频播放器')
        self.setGeometry(100, 100, 600, 400)

        self.video_widget = QWidget()
        self.video_layout = QVBoxLayout()
        self.video_widget.setLayout(self.video_layout)
        self.setCentralWidget(self.video_widget)

        self.label = QLabel()
        self.video_layout.addWidget(self.label)

        self.btn_open = QPushButton('打开')
        self.btn_open.clicked.connect(self.open_video)
        self.video_layout.addWidget(self.btn_open)

        self.btn_play = QPushButton('播放')
        self.btn_play.clicked.connect(self.play_video)
        self.video_layout.addWidget(self.btn_play)

        self.btn_pause = QPushButton('暂停')
        self.btn_pause.clicked.connect(self.pause_video)
        self.video_layout.addWidget(self.btn_pause)

        self.btn_stop = QPushButton('停止')
        self.btn_stop.clicked.connect(self.stop_video)
        self.video_layout.addWidget(self.btn_stop)

        self.video = None
        self.video_thread = None

    def open_video(self):
        video_path, _ = QFileDialog.getOpenFileName(self, '选择视频文件')
        if video_path:
            self.video = ffmpeg.input(video_path)

    def play_video(self):
        if self.video and not self.video_thread:
            self.video_thread = ffmpeg.output(self.video, 'pipe:', format='rawvideo', pix_fmt='rgb24')
            self.video_process = ffmpeg.run_async(self.video_thread, pipe_stdout=True)
            self.play()

    def play(self):
        while True:
            in_bytes = self.video_process.stdout.read(720 * 480 * 3)  # 根据视频分辨率调整每次读取的字节数
            if not in_bytes:
                break
            image = QtGui.QImage(in_bytes, 720, 480, QtGui.QImage.Format_RGB888)
            self.label.setPixmap(QtGui.QPixmap.fromImage(image))

    def pause_video(self):
        if self.video_process:
            self.video_process.send_signal('stop')

    def stop_video(self):
        if self.video_process:
            self.video_process.send_signal('q')
            self.video_process = None
            self.video_thread = None

if __name__ == '__main__':
    app = QApplication(sys.argv)
    player = VideoPlayer()
    player.show()
    sys.exit(app.exec_())

以上代码利用PyQt5和ffmpeg实现了一个基本的视频播放器。用户可以使用打开按钮选择视频文件，然后点击播放按钮开始播放，点击暂停按钮暂停播放，点击停止按钮停止播放。视频播放过程中，每次从ffmpeg进程中读取一帧图片数据，并利用Qt的QImage和QPixmap显示在界面上。请注意，由于视频分辨率不同，每次读取的字节数需要调整。