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You cannot use this:

cvSize(int(capture.get(CV_CAP_PROP_FRAME_WIDTH)), 
int(capture.get(CV_CAP_PROP_FRAME_HEIGHT))));

Try this:

import numpy as np
import cv2

cap = cv2.VideoCapture(0)

fourcc = cv2.VideoWriter_fourcc(*'XVID')
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)
        out.write(frame)

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

You cannot use this:

cvSize(int(capture.get(CV_CAP_PROP_FRAME_WIDTH)), 
int(capture.get(CV_CAP_PROP_FRAME_HEIGHT))));

frame_width = int(cap.get(3))
frame_height = int(cap.get(4))

# Define the codec and create VideoWriter object.The output is stored in 'outpy.avi' file.
out = cv2.VideoWriter('outpy.avi',cv2.VideoWriter_fourcc('M','J','P','G'), 10, (frame_width,frame_height))

import numpy as np
import cv2

cap = cv2.VideoCapture(0)

fourcc = cv2.VideoWriter_fourcc(*'XVID')
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)
        out.write(frame)

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

You cannot use this:

cvSize(int(capture.get(CV_CAP_PROP_FRAME_WIDTH)), 
int(capture.get(CV_CAP_PROP_FRAME_HEIGHT))));

frame_width = int(cap.get(3))
frame_height = int(cap.get(4))

# Define the codec and create VideoWriter object.The output is stored in 'outpy.avi' file.
out = cv2.VideoWriter('outpy.avi',cv2.VideoWriter_fourcc('M','J','P','G'), 10, (frame_width,frame_height))

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

You cannot use this:this: cvSize(int(capture.get(CV_CAP_PROP_FRAME_WIDTH)), int(capture.get(CV_CAP_PROP_FRAME_HEIGHT))));

cvSize(int(capture.get(CV_CAP_PROP_FRAME_WIDTH)), 
int(capture.get(CV_CAP_PROP_FRAME_HEIGHT))));

frame_width = int(cap.get(3))
frame_height = int(cap.get(4))

# Define the codec and create VideoWriter object.The output is stored in 'outpy.avi' file.
out = cv2.VideoWriter('outpy.avi',cv2.VideoWriter_fourcc('M','J','P','G'), 10, (frame_width,frame_height))

Or if you prefer this:

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

You cannot use this: cvSize(int(capture.get(CV_CAP_PROP_FRAME_WIDTH)), int(capture.get(CV_CAP_PROP_FRAME_HEIGHT))));this:

cvSize(int(capture.get(CV_CAP_PROP_FRAME_WIDTH)), 
int(capture.get(CV_CAP_PROP_FRAME_HEIGHT))));

frame_width = int(cap.get(3))
frame_height = int(cap.get(4))

# Define the codec and create VideoWriter object.The output is stored in 'outpy.avi' file.
out = cv2.VideoWriter('outpy.avi',cv2.VideoWriter_fourcc('M','J','P','G'), 10, (frame_width,frame_height))

Or if you prefer this:

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

You cannot use this:used this: cvSize(int(capture.get(CV_CAP_PROP_FRAME_WIDTH)), int(capture.get(CV_CAP_PROP_FRAME_HEIGHT))));

cvSize(int(capture.get(CV_CAP_PROP_FRAME_WIDTH)), 
int(capture.get(CV_CAP_PROP_FRAME_HEIGHT))));

frame_width = int(cap.get(3))
frame_height = int(cap.get(4))

# Define the codec and create VideoWriter object.The output is stored in 'outpy.avi' file.
out = cv2.VideoWriter('outpy.avi',cv2.VideoWriter_fourcc('M','J','P','G'), 10, (frame_width,frame_height))

Or if you prefer this:

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