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the following code produces an output video file but I cant play it with any tool. I have copied the opencv_ffmpeg310_64.dll file into the c:\python2.7 folder. I am on windows 10 and opencv 3.1.0 I tried all types of CODEC none are working.

import numpy as np
import cv2

cap = cv2.VideoCapture(0)

# Define the codec and create VideoWriter object
fourcc = cv2.VideoWriter_fourcc(*'XVID')
#fourcc = cv2.VideoWriter_fourcc(*'XVID')
#fourcc = cv2.VideoWriter_fourcc('M','J','P','G')
out = cv2.VideoWriter('output.avi',fourcc, 20.0, (640,480))

while(cap.isOpened()):
    ret, frame = cap.read()
    if ret==True:
        frame = cv2.flip(frame,0)

        # write the flipped frame
        out.write(frame)

        cv2.imshow('frame',frame)
        if cv2.waitKey(1) & 0xFF == ord('q'):
            break
    else:
        break

# Release everything if job is finished
cap.release()
out.release()
cv2.destroyAllWindows()

the following code produces an output I have tried many codecs , all but the last one produce 0 bytes video, the last codec does produce a video file with some but I cant play it with any tool. then its not playable . This problem is driving me crazy , The code I am using is tested by other users n working. I have copied the opencv_ffmpeg310_64.dll file into the c:\python2.7 folder. I am on windows 10 and opencv 3.1.0 I tried all types of CODEC none are working.

 import numpy as np
 import cv2

 cap = cv2.VideoCapture(0)

 # Define the codec and create VideoWriter object
# Define the codec and create VideoWriter object
#fourcc = cv2.VideoWriter_fourcc(*'FFV1')
#fourcc = cv2.VideoWriter_fourcc(*'XVID')
#fourcc = cv2.VideoWriter_fourcc(*'DIVX')
#fourcc = cv2.VideoWriter_fourcc(*'DIV3')
#fourcc = cv2.VideoWriter_fourcc('F','M','P','4')
#fourcc = cv2.VideoWriter_fourcc('D','I','V','X')
#fourcc = cv2.VideoWriter_fourcc('D','I','V','3')
#fourcc = cv2.VideoWriter_fourcc('F','F','V','1')


fourcc = cv2.VideoWriter_fourcc(*'XVID')
#fourcc = cv2.VideoWriter_fourcc(*'XVID')
#fourcc = cv2.VideoWriter_fourcc('M','J','P','G')
 out = cv2.VideoWriter('output.avi',fourcc, 20.0, (640,480))

 while(cap.isOpened()):
     ret, frame = cap.read()
     if ret==True:
         frame = cv2.flip(frame,0)

         # write the flipped frame
         out.write(frame)

         cv2.imshow('frame',frame)
         if cv2.waitKey(1) & 0xFF == ord('q'):
             break
     else:
         break

 # Release everything if job is finished
 cap.release()
 out.release()
 cv2.destroyAllWindows()