Learning OpenCV 4 Computer Vision with Python 3 - Third Edition

Capturing camera frames

A stream of camera frames is represented by a VideoCapture object too. However, for a camera, we construct a VideoCapture object by passing the camera's device index instead of a video's filename. Let's consider the following example, which captures 10 seconds of video from a camera and writes it to an AVI file. The code is similar to the previous section's sample (which was captured from a video file instead of a camera) but changes are marked in bold:

import cv2cameraCapture = cv2.VideoCapture(0)fps = 30  # An assumptionsize = (int(cameraCapture.get(cv2.CAP_PROP_FRAME_WIDTH)),        int(cameraCapture.get(cv2.CAP_PROP_FRAME_HEIGHT)))videoWriter = cv2.VideoWriter( 'MyOutputVid.avi', cv2.VideoWriter_fourcc('I','4','2','0'), ...