python+openCV对视频进行截取的实现

Python itxz 2个月前 (11-27) 35次浏览 0个评论

使用cv2对视频进行切割

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] # 原视频图片的高度
    f_width = f_shape[1]
    fps = cap.get(5) # 帧速率
    frame_number = cap.get(7) # 视频文件的帧数
    duration = frame_number / fps # 视频总帧数/帧速率 是时间/秒【总共有多少秒的视频时间】
    if start_time > duration or end_time > duration:
      return
    start_time = fps * float(start_time)
    end_time = fps * float(end_time)
    # AVI格式编码输出 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编码格式:

fourcc意为四字符代码(Four-Character Codes),顾名思义,该编码由四个字符组成,下面是VideoWriter_fourcc对象一些常用的参数,注意:字符顺序不能弄混
cv2.VideoWriter_fourcc(‘I’, ‘4’, ‘2’, ‘0’),该参数是YUV编码类型,文件名后缀为.avi
cv2.VideoWriter_fourcc(‘P’, ‘I’, ‘M’, ‘I’),该参数是MPEG-1编码类型,文件名后缀为.avi
cv2.VideoWriter_fourcc(‘X’, ‘V’, ‘I’, ‘D’),该参数是MPEG-4编码类型,文件名后缀为.avi
cv2.VideoWriter_fourcc(‘T’, ‘H’, ‘E’, ‘O’),该参数是Ogg Vorbis,文件名后缀为.ogv
cv2.VideoWriter_fourcc(‘F’, ‘L’, ‘V’, ‘1’),该参数是Flash视频,文件名后缀为.flv


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