🐟 OpenCV代码片段
# 视频
## 视频裁剪
视频输出的大小一定不要写错，裁剪大小由frame[:,:,:]这行代码控制。
`cv2.waitKey(0)`表示等待0毫秒
```python
import cv2
cap = cv2.VideoCapture("fight.avi")
video_writer = cv2.VideoWriter('output.avi', cv2.VideoWriter_fourcc(*'avc1'), 30, (640, 720))
ret, frame = cap.read()
while ret:
frame = frame[:,640:,:]
cv2.imshow("Video", frame)
video_writer.write(frame)
ret, frame = cap.read()
if cv2.waitKey(1) == ord("q"):
video_writer.release()
cap.release()
cv2.destroyAllWindows()
```