(1)安装:
pip install opencv-python
如果想使用高级的方法需要安装:
pip3 install opencv-contrib-python
备注:如果在安装时出现卡住长时间不动,可以通过升级pip来避免:
pip3 install --upgrade pip
pip3 install -i https://mirrors.aliyun.com/pypi/simple opencv-contrib-python
如果使用import cv2报错:ImportError: cannot import name '_registerMatType',说明opencv版本与opencv-contrib版本不一致,需要重新安装。
(2)视频读取:
import cv2
cap = cv2.VideoCapture("video/stream")
cap.get(cv2.CAP_PROP_FRAME_WIDTH) ##获取视频文件、视频流的宽
cap.get(cv2.CAP_PROP_FRAME_HEIGHT) ##获取高
cap.get(cv2.CAP_PROP_FPS) ##获取帧率
cap.get(cv2.CAP_PROP_FRAME_COUNT) ##获取视频帧数
while True:
if not cap.isOpened():
continue
ret,frame = cap.read()
if not ret:
continue
print(frame)
cap.release()
cap.get()获取视频信息,具体参考文档:OpenCV: Flags for video I/O
(3)视频写入:
fourcc = cv2.VideoWriter_fourcc('m', 'p', '4', 'v')
out = cv2.VideoWriter(outvideo,fourcc,rate,(bak_w,bak_h),True)
while True:
img = cv2.imread("1.jpg")
if not img:
break
out.write(img)
out.release()