python安装opencv：

pip install opencv-python

提取视频帧 视频转图片：

import os

mp4file = 'input.mp4'
savefile = "./output"
if not os.path.exists(savefile):
    os.mkdir(savefile)

import cv2

cap = cv2.VideoCapture(mp4file)
fourcc = cv2.VideoWriter_fourcc(*'XVID')
fps = cap.get(cv2.CAP_PROP_FPS)
size = (int(cap.get(cv2.CAP_PROP_FRAME_WIDTH)), int(cap.get(cv2.CAP_PROP_FRAME_HEIGHT)))
print(fps)
print(size)
i = 0
while (cap.isOpened()):
    i = i + 1
    ret, frame = cap.read()
    if ret == True:
        cv2.imwrite(savefile + '/' + str(i) + '.jpg', frame)
        if cv2.waitKey(1) & 0xFF == ord('q'):
            break
    else:
        break
print(i)
cap.release()
cv2.destroyAllWindows()

图片转视频：

import os

mp4file = 'out.mp4'
savefile = "./output"
if not os.path.exists(savefile):
    os.mkdir(savefile)

import cv2

fourcc = cv2.VideoWriter_fourcc(*'XVID')
fps = 30
size =(720, 1280)
videoWriter = cv2.VideoWriter(mp4file, fourcc, fps, size)  # 最后一个是保存图片的尺寸

for i in range(1, 1402):
    frame = cv2.imread(savefile + '/' + str(i) + '.jpg')
    videoWriter.write(frame)
videoWriter.release()