Writing an mp4 video using python opencv

Writing an mp4 video using python opencv

This worked for me.

self._name = name + .mp4
self._cap = VideoCapture(0)
self._fourcc = VideoWriter_fourcc(*MP4V)
self._out = VideoWriter(self._name, self._fourcc, 20.0, (640,480))

What worked for me was to make sure the input frame size is equal to output videos size (in this case, (680, 480) ).

http://answers.opencv.org/question/27902/how-to-record-video-using-opencv-and-python/

Here is my working code (Mac OSX Sierra 10.12.6):

cap = cv2.VideoCapture(0)
cap.set(3,640)
cap.set(4,480)

fourcc = cv2.VideoWriter_fourcc(*MP4V)
out = cv2.VideoWriter(output.mp4, fourcc, 20.0, (640,480))

while(True):
    ret, frame = cap.read()
    out.write(frame)
    cv2.imshow(frame, frame)
    c = cv2.waitKey(1)
    if c & 0xFF == ord(q):
        break

cap.release()
out.release()
cv2.destroyAllWindows()

Note: I installed openh264 as suggested by @10SecTom but Im not sure if that was relevant to the problem.

Just in case:

brew install openh264

Writing an mp4 video using python opencv

There are some things to change in your code:

1. Change the name of your output to output.mp4 (change to .mp4)
2. I had the the same issues that people have in the comments, so I changed the fourcc to 0x7634706d: out = cv2.VideoWriter(output.mp4,0x7634706d , 20.0, (640,480))