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up vote 0 down vote favorite 
import cv
import cv2
cap = cv2.VideoCapture(0)
cap.set(8,100)
out = cv2.VideoWriter('/home/pi/Desktop/output.mp4',cv2.cv.CV_FOURCC('D','I','V','X'),20.0,(640,480))
while(cap.isOpened()):
    ret, frame = cap.read()
    if ret==True:
        frame = cv2.flip(frame,0)
        out.write(frame)
        cv2.imshow('frame',frame)
        if cv2.waitKey(10) == 27: 
            break
cv2.VideoCapture(0).release()
out.release()
cv2.destoryAllWindow()

This code worked but it never stopped and no video file had been saved. Does anyone know how to solve this? Thanks a lot. xx

share|improve this question
    
Do the frames show up on the screen? Are the frames exactly 640x480 pixels? What happened when you pressed Escape? –  w-m Mar 6 '14 at 17:35
    
@w.m Sorry i just saw the comment. Yes, the frames showed up on the screen and it was exactly 640*480. When i pressed ESC, an error occurred. It displayed that cv2.VideoWriter object has no attribute 'release' –  VaFancy Mar 6 '14 at 22:19

1 Answer 1

up vote 2 down vote accepted

Both release() calls can be removed.

cv2.VideoCapture(0).release()

would call release() on a new VideoCapture, what you meant was cap.release().

For the VideoWriter, the release method doesn't exist - you don't have to care about releasing the VideoWriter or VideoCapture in Python. They will be released when their object is destroyed at the end of your program.

share|improve this answer
    
Thank you for answering me. I tried remove this line, but a new error occurs. "object has no attribute 'destroyAllWindows'" –  VaFancy Mar 6 '14 at 23:06
    
And when I used "DestroyWindow('frame')", it had the same problem. –  VaFancy Mar 6 '14 at 23:07
    
destroy, not destory –  w-m Mar 6 '14 at 23:24
    
My spelling mistake. But I typed the right version in my script while having this problem. –  VaFancy Mar 6 '14 at 23:33
    
And you corrected it to Window_S_, too? OpenCV does have a destroyAllWindows() method, and you are correct to call it there. –  w-m Mar 7 '14 at 7:20

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