[Python知识库]python的视频分帧

视频分帧

下面代码的速度大约为：400帧 17s，20帧2.8s。

代码：

import cv2
from PIL import Image
import numpy as np
import time

time_start = time.time()

cap = cv2.VideoCapture('F:/photo_stitching/video_duct/7.84_49.mp4')  # 获取视频对象
isOpened = cap.isOpened  # 判断是否打开
# 视频信息获取
fps = cap.get(cv2.CAP_PROP_FPS)

imageNum = 0
sum=0
# timef=15  #隔15帧保存一张图片
timef=20  #隔15帧保存一张图片

while (isOpened):
    sum+=1
    (frameState, frame) = cap.read()  # 记录每帧及获取状态
    if frameState == True and (sum % timef==0):
        # 格式转变，BGRtoRGB
        frame = cv2.cvtColor(frame, cv2.COLOR_BGR2RGB)
        # 转变成Image
        frame = Image.fromarray(np.uint8(frame))
        frame = np.array(frame)
        # RGBtoBGR满足opencv显示格式
        frame = cv2.cvtColor(frame, cv2.COLOR_RGB2BGR)
        imageNum = imageNum + 1
        fileName = 'F:/photo_stitching/video_duct/7.84_49_test/' + str(imageNum) + '.jpg'  # 存储路径
        cv2.imwrite(fileName, frame, [cv2.IMWRITE_JPEG_QUALITY, 100])
        # print(fileName + " successfully write in")  # 输出存储状态

    elif frameState == False:
        break
print('finish!')

time_end = time.time()
d_time = time_end - time_start
print("图像分帧的耗时为 %.8s S"%d_time)
cap.release()