Python+OpenCV开发一个视频播放器

pip install opencv-python  # Python版本

import cv2

cap = cv2.VideoCapture('video.mp4')
while cap.isOpened():
    ret, frame = cap.read()
    if not ret:
        break
    cv2.imshow('Player', frame)
    if cv2.waitKey(25) == 27:  # 按ESC退出
        break
cap.release()
cv2.destroyAllWindows()

self.speed = 1.0  # 初始速度
key = cv2.waitKey(max(1, int(25 / self.speed)))  # 确保延迟≥1ms

#创建进度条
cv2.createTrackbar('Progress', 'Player', 0, total_frames, self.on_trackbar)
#回调函数
def on_trackbar(self, pos):
    self.cap.set(cv2.CAP_PROP_POS_FRAMES, pos)  # 跳转到指定帧

def draw_overlay(self, frame):
    # 计算进度条长度
    progress_width = int(frame.shape * (self.current_frame / self.total_frames))
    cv2.rectangle(frame, (0, 10), (progress_width, 30), (0, 255, 0), -1)
    # 显示时间
    cv2.putText(frame, f"Time: {self.current_frame/self.fps:.2f}s", (10, 60), cv2.FONT_HERSHEY_SIMPLEX, 0.7, (0, 255, 0), 2)

import cv2

class VideoPlayer:
    def __init__(self, video_path):
        self.cap = cv2.VideoCapture(video_path)
        if not self.cap.isOpened():
            raise ValueError("无法打开视频文件，请检查路径或格式")

        # 获取视频属性
        self.total_frames = int(self.cap.get(cv2.CAP_PROP_FRAME_COUNT))
        if self.total_frames <= 0:
            raise ValueError("视频总帧数无效，请检查文件格式")
        self.fps = self.cap.get(cv2.CAP_PROP_FPS)
        self.delay = int(1000 / self.fps)  # 默认帧延迟（毫秒）

        # 初始化播放控制变量
        self.pause = False
        self.current_frame = 0
        self.speed = 1.0  # 播放速度倍数

        # 创建窗口和进度条
        cv2.namedWindow('OpenCV Video Player')
        cv2.createTrackbar('Progress', 'OpenCV Video Player', 0, self.total_frames, self.on_trackbar)

    def on_trackbar(self, pos):
        """进度条回调函数"""
        self.current_frame = pos
        self.cap.set(cv2.CAP_PROP_POS_FRAMES, pos)

    def run(self):
        while True:
            if not self.pause:
                ret, frame = self.cap.read()
                if not ret:
                    # 视频结束，重置到开头循环播放
                    self.cap.set(cv2.CAP_PROP_POS_FRAMES, 0)
                    self.current_frame = 0
                    continue
                self.current_frame += 1

                # 更新进度条位置（避免递归调用）
                cv2.setTrackbarPos('Progress', 'OpenCV Video Player', self.current_frame)

                # 在帧上绘制进度条和时间戳
                self.draw_overlay(frame)

                cv2.imshow('OpenCV Video Player', frame)

            # 处理键盘事件（确保延迟不低于1ms）
            key = cv2.waitKey(max(1, int(self.delay / self.speed)))
            if key == 27:  # ESC退出
                break
            elif key == 32:  # 空格键暂停/继续
                self.pause = not self.pause
            elif key == ord('+'):  # 加速
                self.speed = min(4.0, self.speed + 0.5)
                print(f"加速至 {self.speed}x")
            elif key == ord('-'):  # 减速
                self.speed = max(0.5, self.speed - 0.5)
                print(f"减速至 {self.speed}x")

        self.cap.release()
        cv2.destroyAllWindows()

    def draw_overlay(self, frame):
        """绘制进度条、时间和速度信息"""
        # 进度条：基于视频宽度计算
        video_width = frame.shape[1]
        progress_ratio = self.current_frame / self.total_frames
        progress_width = int(video_width * progress_ratio)
        cv2.rectangle(frame, (0, 10), (progress_width, 30), (0, 255, 0), -1)

        # 时间戳
        current_time = self.current_frame / self.fps
        time_text = f"Time: {current_time:.2f}s"
        cv2.putText(frame, time_text, (10, 60), cv2.FONT_HERSHEY_SIMPLEX, 0.7, (0, 255, 0), 2)

        # 播放速度
        speed_text = f"Speed: {self.speed:.1f}x"
        cv2.putText(frame, speed_text, (10, 100), cv2.FONT_HERSHEY_SIMPLEX, 0.7, (0, 255, 0), 2)

if __name__ == "__main__":
    player = VideoPlayer('/home/Videos/movie/1.mp4')  # 替换为你的视频路径
    player.run()