python截取視頻中的某一段，保存為avi結尾的視頻

# 功能：對視頻文件進行剪切。
# 剪切指定長度的視頻，選擇要裁剪的視頻，選擇開始時間點和停止時間點即可。
# 將處理后的視頻保存為output.avi文件

import cv2  # OpenCV
import tkinter.filedialog  # Python文件對話框

def samllVideoGif(_videoPath,_videoGifPath):
    # _videoPath = "C:\\Users\\sswc\\Desktop\\gai2\\public\\showPdf\\6f3db1f9-e247-4aa5-bca7-93bae62a0079.mp4"
    # _videoGifPath = "C:\\Users\\sswc\\Desktop\\gai2\\public\\showPdf\\6f3db1f9-e247-4aa5-bca7-93bae62a0079.avi"
    cap = cv2.VideoCapture(_videoPath)  # 打開視頻文件
    frames = cap.get(cv2.CAP_PROP_FRAME_COUNT)  # 獲得視頻文件的幀數
    fps = cap.get(cv2.CAP_PROP_FPS)  # 獲得視頻文件的幀率
    width = cap.get(cv2.CAP_PROP_FRAME_WIDTH)  # 獲得視頻文件的幀寬
    height = cap.get(cv2.CAP_PROP_FRAME_HEIGHT)  # 獲得視頻文件的幀高

    # 創建保存視頻文件類對象
    fourcc = cv2.VideoWriter_fourcc(*'XVID')
    out = cv2.VideoWriter(_videoGifPath, fourcc, fps, (int(width), int(height)))

    # 計算視頻長度/s
    video_length = frames / fps
    # print('start and stop must < %.1f' % video_length)  # 提示用戶輸入變量的范圍
    # start = float(input('Input an start time/s:'))
    # stop = float(input('Input an stop time/s:'))
    # print('start and stop must < %.1f' % video_length)  # 提示用戶輸入變量的范圍
    start = 0
    stop = 10
    # 設置幀讀取的開始位置
    cap.set(cv2.CAP_PROP_POS_FRAMES, start * fps)
    pos = cap.get(cv2.CAP_PROP_POS_FRAMES)  # 獲得幀位置
    while (pos <= stop * fps):
        ret, frame = cap.read()  # 捕獲一幀圖像
        out.write(frame)  # 保存幀
        pos = cap.get(cv2.CAP_PROP_POS_FRAMES)

    cap.release()
    out.release()