CCTV using OpenCV+Raspberry

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Hello i make some project like CCTV with python opencv and raspberry pi. I can access webcam using cv2.VideoCapture and save in avi Video Format with cv2.VideoWriter, but my problem is sometimes the file size in video format limited maximum 140 MB which just save video in short duration. Sorry for my english. Here is my program

MySoftware: https://stackoverflow.com/questions/45540021/create-cctv-with-opencv-python-and-raspberry