视频跳帧播放器设计与实现

视频跳帧播放器设计与实现

下面我将设计并实现一个功能完善的视频跳帧播放器，支持设置多个跳帧区间，并提供直观的用户界面。

设计思路

这个播放器需要实现以下核心功能：

• 视频文件加载和基本播放控制
• 设置跳帧区间（起始帧和结束帧）
• 播放过程中自动跳过指定帧区间
• 可视化时间轴和跳帧区间
• 帧数显示和跳转功能

实现方案

import sys
import cv2
import numpy as np
from PyQt5.QtWidgets import *
from PyQt5.QtGui import *
from PyQt5.QtCore import *
from PyQt5.QtMultimedia import QMediaPlayer, QMediaContent
from PyQt5.QtMultimediaWidgets import QVideoWidget

class VideoFramePlayer(QMainWindow):
    def __init__(self):
        super().__init__()
        self.setWindowTitle("高级视频跳帧播放器")
        self.setGeometry(100, 100, 1200, 800)
        
        # 初始化变量
        self.video_path = ""
        self.cap = None
        self.total_frames = 0
        self.fps = 0
        self.current_frame = 0
        self.is_playing = False
        self.jump_intervals = []  # 存储跳帧区间 [(start1, end1), (start2, end2), ...]
        
        # 创建UI
        self.create_ui()
        
        # 初始化定时器
        self.timer = QTimer(self)
        self.timer.timeout.connect(self.update_frame)
        
        # 设置样式
        self.set_style()
        
    def create_ui(self):
        # 主布局
        main_widget = QWidget()
        self.setCentralWidget(main_widget)
        main_layout = QVBoxLayout()
        main_widget.setLayout(main_layout)
        
        # 视频显示区域
        self.video_label = QLabel()
        self.video_label.setAlignment(Qt.AlignCenter)
        self.video_label.setMinimumSize(800, 450)
        self.video_label.setStyleSheet("background-color: #222; border: 1px solid #444;")
        main_layout.addWidget(self.video_label)
        
        # 控制区域
        control_layout = QHBoxLayout()
        
        # 播放控制按钮
        self.play_btn = QPushButton("播放")
        self.play_btn.clicked.connect(self.toggle_play)
        self.play_btn.setMinimumSize(80, 30)
        
        self.stop_btn = QPushButton("停止")
        self.stop_btn.clicked.connect(self.stop)
        self.stop_btn.setMinimumSize(80, 30)
        
        self.open_btn = QPushButton("打开视频")
        self.open_btn.clicked.connect(self.open_video)
        self.open_btn.setMinimumSize(100, 30)
        
        control_layout.addWidget(self.open_btn)
        control_layout.addWidget(self.play_btn)
        control_layout.addWidget(self.stop_btn)
        
        # 帧信息
        self.frame_label = QLabel("帧: 0 / 0")
        control_layout.addWidget(self.frame_label)
        
        main_layout.addLayout(control_layout)
        
        # 跳帧控制区域
        jump_frame_layout = QHBoxLayout()
        
        self.start_frame_input = QSpinBox()
        self.start_frame_input.setRange(0, 999999)
        self.start_frame_input.setValue(0)
        self.start_frame_input.setPrefix("起始帧: ")
        
        self.end_frame_input = QSpinBox()
        self.end_frame_input.setRange(0, 999999)
        self.end_frame_input.setValue(100)
        self.end_frame_input.setPrefix("结束帧: ")
        
        self.add_jump_btn = QPushButton("添加跳帧区间")
        self.add_jump_btn.clicked.connect(self.add_jump_interval)
        
        self.clear_jump_btn = QPushButton("清除所有跳帧")
        self.clear_jump_btn.clicked.connect(self.clear_jump_intervals)
        
        jump_frame_layout.addWidget(self.start_frame_input)
        jump_frame_layout.addWidget(self.end_frame_input