python opencv打开摄像头拍照与录像

import cv2

def make_photo():
    """使用opencv拍照"""
    cap = cv2.VideoCapture(0)  # 默认的摄像头
    while True:
        ret, frame = cap.read()
        if ret:
            cv2.imshow("capture", frame)  # 弹窗口
            # 等待按键q操作关闭摄像头
            if cv2.waitKey(1) & 0xFF == ord('q'):
                file_name = "xieyang.jpeg"
                cv2.imwrite(file_name, frame)
                break
        else:
            break

    cap.release()
    cv2.destroyAllWindows()


def make_video():
    """使用opencv录像"""
    cap = cv2.VideoCapture(0)  # 默认的摄像头
    # 指定视频代码
    fourcc = cv2.VideoWriter_fourcc(*"DIVX")
    out = cv2.VideoWriter('xieyang.avi', fourcc, 20.0, (640,480))
    while(cap.isOpened()):
        ret, frame = cap.read()
        if ret:
            out.write(frame)
            #
            cv2.imshow('frame',frame)
            # 等待按键q操作关闭摄像头
            if cv2.waitKey(1) & 0xFF == ord('q'):
                break
        else:
            break
    cap.release()
    out.release()
    cv2.destroyAllWindows()

if __name__ == '__main__':
    make_video()