For one of my application i want to write code to process high frame rate videos in which a small white dot in a grayscale image will be moving
in order to start building above application, i wanted to create a high frame rate video in first place for which i have tried to write the following code
import cv2
import numpy as np
# as normal usage thrown me error i am using this
fourcc = cv2.cv.CV_FOURCC(*'XVID')
#last parameter 1, i want to create a grayscale video
writer = cv2.VideoWriter("output.avi", fourcc, 100,(700,500),1)
i = 0
j = 0
for frame in range(100):
ref_image_array = np.zeros((700,500),np.uint8)
#trying to change the circle position in every image
cv2.circle(ref_image_array,(490-i,690-j),5,255,-1)
writer.write(ref_image_array)
i= i + 1
j= j + 1
writer.release()
print 'Writing Done'
cap = cv2.VideoCapture('output.avi')
while(cap.isOpened()):
print 'valid file'
ret, frame = cap.read()
gray = cv2.cvtColor(frame, cv2.COLOR_BGR2GRAY)
cv2.imshow('frame',gray)
if cv2.waitKey(1) & 0xFF == ord('q'):
break
cap.release()
cv2.destroyAllWindows()
i find something wrong with the way i am writing , because i am not able to play the video, kindly guide me
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