# 功能：對視訊檔案進行剪下。
# 剪下指定長度的視訊，選擇要裁剪的視訊，選擇開始時間點和停止時間點即可。
# 將處理後的視訊儲存為output.avi檔案
import cv2  # OpenCV
import tkinter.filedialog  # Python檔案對話方塊

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)  # 開啟視訊檔案
    frames = cap.get(cv2.CAP_PROP_FRAME_COUNT)  # 獲得視訊檔案的幀數
    fps = cap.get(cv2.CAP_PROP_FPS)  # 獲得視訊檔案的幀率
    width = cap.get(cv2.CAP_PROP_FRAME_WIDTH)  # 獲得視訊檔案的幀寬
    height = cap.get(cv2.CAP_PROP_FRAME_HEIGHT)  # 獲得視訊檔案的幀高

    # 建立儲存視訊檔案類物件
    fourcc = cv2.VideoWriter_fourcc(*'XVID')
 
    out = cv2.VideoWriter(_videoGifPath, fourcc, fps, (int(width), int(height)))

    # 計算視訊長度/s
    video_length = frames / fps
    # print('start and stop must < %.1f' % video_length)  # 提示使用者輸入變數的範圍
    # start = float(input('Input an start time/s:'))
    # stop = float(input('Input an stop time/s:'))
    # print('start and stop must < %.1f' % video_length)  # 提示使用者輸入變數的範圍
 
    start = 0
    stop = 10
    # 設定幀讀取的開始位置
    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()  # 捕獲一幀影象
        out.write(frame)  # 儲存幀
        pos = cap.get(cv2.CAP_PROP_POS_FRAMES)

    cap.release()
    out.release()