python3 opencv截取视频_python+openCV对视频进行截取的实现

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