关于python:pythonopenCV对视频进行截取

应用cv2对视频进行切割

import cv2def 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 是工夫/秒【总共有多少秒的视频工夫】        if start_time > duration or end_time > duration:            return        start_time = fps * float(start_time)        end_time = fps * float(end_time)        # AVI格局编码输入 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编码格局：

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,上面是VideoWriter_fourcc对象一些罕用的参数，留神：字符程序不能弄混
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