Python-OpenCV读取视频文件

import cv2


def capture_video():
    capture = cv2.VideoCapture('01.mp4')
    while True:
        ret, frame = capture.read()
        if not ret:
            break
        cv2.imshow('video', frame)
        if cv2.waitKey(50) == 27:
            break


capture_video()

cv2.waitKey(0)
cv2.destroyAllWindows()

if name == “main”:
stream_processing()

 - 从摄像头中读取

```python
import cv2

def video_demo(oxff=None):
    capture = cv2.VideoCapture(0)     # 捕捉摄像头
    while True:
        ret, frame = capture.read()
        # 读取摄像头，它能返回两个参数，第一个参数是bool 型的ret,其值为True或者False，代表有没有读到图片；
        # 第二个参数frame,表示读取当前一帧的图片
        frame = cv2.flip(frame, 1)  # 翻转   等于0：上下颠倒,大于0：水平颠倒,小于0:180旋转
        cv2.imshow("video", frame)

        if cv2.waitKey(10) == 27:   #按ESC停止(两下)
            break
        '''
        if cv2.waitKey(10) & 0xff == ord('q'):
            break
        '''
video_demo()
cv2.waitKey(0)
cv2.destroyAllWindows()