该程序功能只将mp4转为jpg

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背景

在实现opencv逐帧获取视频转存为图片后我便有了编写程序以图形的形式显示操作页面的想法。本文是基于上篇文章代码的修改以实现简单的GUI图形界面。

实现过程中发现仍需要深化学习的技术

• 线程与进程
• tkinter
• pathlib
• 打包为exe
• 发布到局域网

下图为运行结果实例

import tkinter as tk
from tkinter import filedialog
import cv2
from pathlib import Path
import threading

global is_processing,current_task,pool,pause_event
pause_event = threading.Event()
pause_event.set()
is_processing = True
pool = None


def select_video():
    video_path =filedialog.askdirectory()
    entry_video.delete(0, tk.END)
    entry_video.insert(0, video_path)

def select_output_dir():
    output_dir = filedialog.askdirectory()
    entry_output.delete(0, tk.END)
    entry_output.insert(0, output_dir)


def start_process():
    global  is_processing
    is_processing = True
    app_status()



def stop_process():
    global is_processing,pool
    is_processing = False


def break_process():
    global is_processing,pause_event
    # is_processing = False
    pause_event.clear()

def continue_process():
    global is_processing,thread,pause_event
    # is_processing = True
    pause_event.set()



def app_status():
    global is_processing,thread
    video_path = entry_video.get()
    output_dir = entry_output.get()
    interval = int(frame_interval_entry.get())
    thread = threading.Thread(target=run,args=(video_path,output_dir,interval))
    thread.start()


def output_img(video_path, img_dir,frame_interval):
    global is_processing,pause_event
    # 由视频逐帧输出图片
    # video_path: 视频文件路径
    # img_dir: 图片保存目录路径，路径不支持中文
    cv = cv2.VideoCapture(video_path)
    frame_count = 0
    n = 0
    while is_processing:
        ret, frame = cv.read()
        if not ret:
            break
        frame_count += 1
        if frame_count % frame_interval == 0:
            if not pause_event.is_set():  # 检查是否需要暂停线程
                pause_event.wait()
            n += 1
            img_name = f"0000000{n}.jpg"
            img_file_path = Path(img_dir) / img_name
            if not img_file_path.exists():
                print("创建文件:", img_file_path)
                cv2.imwrite(str(img_file_path), frame, [cv2.IMWRITE_JPEG_QUALITY, 100])
            else:
                print("跳过:", img_file_path)

def run(video_dir, img_dir,frame_interval):
    global is_processing
    while is_processing:
        if not is_processing:
            break
        for file in Path(video_dir).iterdir():
            if file.suffix == ".mp4":
                video_file_path = str(file)
                img_dir_name = Path(img_dir) / file.stem  # 使用视频文件名作为子目录名
                img_dir_name.mkdir(parents=True, exist_ok=True)
                output_img(video_file_path, str(img_dir_name),frame_interval)
    print("Thread execution stopped")


# 创建主窗口
root = tk.Tk()
root.title("视频处理程序")
root.geometry("800x600")

# 添加选择视频按钮
btn_select_video = tk.Button(root, text="选择视频文件", command=select_video)
btn_select_video.pack(side='top',pady=10)

# 添加选择输出路径按钮
btn_select_output = tk.Button(root, text="选择输出路径", command=select_output_dir)
btn_select_output.pack(side='top',pady=10)

# 显示视频路径输入框
entry_video = tk.Entry(root)
entry_video.pack()

# 显示输出路径输入框
entry_output = tk.Entry(root)
entry_output.pack()

# 添加帧间隔输入框
frame_interval_label = tk.Label(root, text="帧间隔：")
frame_interval_label.pack(side='top', pady=10)
frame_interval_entry = tk.Entry(root)
frame_interval_entry.pack()

# 添加开始处理按钮
btn_start = tk.Button(root, text="开始处理", command=start_process)
btn_start.pack(side='top',pady=10)

# 添加停止处理按钮
btn_start = tk.Button(root, text="停止处理", command=stop_process)
btn_start.pack(side='top',pady=10)

# 添加暂停处理按钮
btn_start = tk.Button(root, text="暂停处理", command=break_process)
btn_start.pack(side='top',pady=10)

# 添加继续处理按钮
btn_start = tk.Button(root, text="继续处理", command=continue_process)
btn_start.pack(side='top',pady=10)


# 启动主循环
root.mainloop()