使用cv2對視訊進行切割

import cv2


def clip_video(source_video,target_video,start_time,end_time):
  cap = cv2.VideoCapture(source_video)
  if not cap.isOpened():
    logger_warning('video is not opened')
  else:
    success,frame = cap.read()
    f_shape = frame.shape
    f_height = f_shape[0] # 原視訊圖片的高度
    f_width = f_shape[1]
    fps = cap.get(5) # 幀速率
    frame_number = cap.get(7) # 視訊檔案的幀數
    duration = frame_number / fps # 視訊總幀數/幀速率 是時間/秒【總共有多少秒的視訊時間】
    if start_time > duration or end_time > duration:
      return
    start_time = fps * float(start_time)
    end_time = fps * float(end_time)
    # AVI格式編碼輸出 XVID
    four_cc = cv2.VideoWriter_fourcc(*'H264')
    video_writer = cv2.VideoWriter(target_video,four_cc,fps,(int(f_width),int(f_height)))
    num = 0
    while True:
      success,frame = cap.read()
      if int(start_time) <= int(num) <= int(end_time):
        if success:
          video_writer.write(frame)
        else:
          break
      num += 1
      if num > frame_number:
        break
    cap.release()

VideoWriter_fourcc編碼格式：

fourcc意為四字元程式碼（Four-Character Codes），顧名思義，該編碼由四個字元組成,下面是VideoWriter_fourcc物件一些常用的引數，注意：字元順序不能弄混
cv2.VideoWriter_fourcc('I','4','2','0'),該引數是YUV編碼型別，檔名字尾為.avi
cv2.VideoWriter_fourcc('P','I','M','I'),該引數是MPEG-1編碼型別，檔名字尾為.avi
cv2.VideoWriter_fourcc('X','V','D'),該引數是MPEG-4編碼型別，檔名字尾為.avi

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