Using Python opencv to realize the mutual conversion between video and picture

Recently, we have to convert data sets frequently for experiments, so record 1.

1. Video to picture

That is, the video is parsed into a picture of 1 frame and 1 frame:

import cv2
vc=cv2.VideoCapture("/home/hqd/PycharmProjects/1/1/19.MOV")
c=1
if vc.isOpened():
  rval,frame=vc.read()
else:
  rval=False
while rval:
  rval,frame=vc.read()
  cv2.imwrite('/home/hqd/PycharmProjects/1/1/19/'+str(c)+'.jpg',frame)
  c=c+1
  cv2.waitKey(1)
vc.release()

2. Picture to video

That is, to convert pictures into video, the frame rate used here is 30 frames/second:

import cv2import os
fps = 30
fourcc = cv2.VideoWriter_fourcc('M', 'J', 'P', 'G')
video_writer = cv2.VideoWriter(filename='./result.avi', fourcc=fourcc, fps=fps, frameSize=(1920, 1080))
for i in range(0,6000):
  p = i
  if os.path.exists('/home/hqd/PycharmProjects/1/qqqq/'+str(p)+'.jpg'):  # Judge whether the picture exists or not 
    img = cv2.imread(filename='/home/hqd/PycharmProjects/1/qqqq/'+str(p)+'.jpg')
    cv2.waitKey(100)
    video_writer.write(img)
    print(str(p) + '.jpg' + ' done!')
video_writer.release()

Summarize