使用 opencv 逐帧处理视频

Question

import numpy as np
import cv2
cap = cv2.VideoCapture(0)
count = 0
fourcc = cv2.VideoWriter_fourcc("drop.avi")
out = cv2.VideoWriter('drop.avi',fourcc, 20.0, (640,480))
while True:
   # Capture frame-by-frame
   ret, frame = cap.read()
   # Our operations on the frame come here
   gray = cv2.cvtColor(frame, cv2.COLOR_BGR2GRAY)
   name = "frame%d.jpg"%count   # save frame as JPEG file
   cv2.imwrite(name,frame)

   # Display the resulting frame
   cv2.imshow('frame',gray)
   if cv2.waitKey(10):
      break

Answer 1

你指定了错误的 foucc。

fourcc = cv2.cv.CV_FOURCC(*'XVID') 
video_writer = cv2.VideoWriter("drop.avi", fourcc, 20, (640,480))

更多信息请看这里