网络摄像机 Python 错误

Question

我正在尝试从 IP 摄像机访问视频。我正在使用 OpenCV 和 Python 来做到这一点。我尝试过的代码如下：

import numpy as np
import cv2
from cv2 import cv

camera=cv.CaptureFromFile("http://root:root@192.168.0.90/axis-cgi/mjpg/video.cgi?resolution=640x480&req_fps=30&.mjpg")
if camera is None:
    print 'Camera is null'
else:
    print 'Camera is not null'
cv.NamedWindow("win")

while True:
    image=cv.QueryFrame(camera)
    cv.ShowImage("win", image)
    k=int(cv.WaitKey(10))
    if k is 27:
        break

在运行此代码时，我得到的输出是：

Image not converted

在使用另一种方法时，CaptureFromCAM 而不是CaptureFromFile，代码是：

import numpy as np
import cv2
from cv2 import cv

camera=cv.CaptureFromCAM(0)
if camera is None:
    print 'Camera is null'
else:
    print 'Camera is not null'
cv.NamedWindow("win")

while True:
    image=cv.QueryFrame(camera)
    if image is None:
        print 'No conversion to IPL Image'
        break
    else:
        cv.ShowImage("win", image)

当我运行这段代码时，我得到的错误是：

ERROR: SampleCB() - buffer sizes do not match
No conversion to IPL Image

我读过它，SampleCB() 错误是在缓冲区大小与预期输入大小不匹配的情况下。我试图更改流分辨率，但似乎没有任何效果。我关注了this 线程和this 线程。他们正在提供 C++ 代码并且在转换为 Python（上面给出的代码）时它不起作用。或者线程给出了运动检测的代码。我正在使用 Windows 7 和 Eclipse 与 Pydev 进行开发。我该怎么办？

Answer 1

哦，请坚持使用 cv2 API。旧的 cv 在当前的 OpenCV 版本中不再可用：

import numpy as np
import cv2

cv2.namedWindow("win")
camera = cv2.VideoCapture("http://username:pass@192.168.0.90/axis-cgi/mjpg/video.cgi?resolution=640x480&req_fps=30&.mjpg")
while camera.isOpened():
    ok, image = camera.read()
    if not ok:
        print 'no image read'
        break
    cv2.imshow("win", image)
    k = cv2.waitKey(1) & 0xff
    if k == 27 : break # Esc pressed

Answer 2

看这个例子用python和OpenCV，IPCAM hikvision

import numpy as np 
import cv2

cap = cv2.VideoCapture() 
cap.open("rtsp://USER:PASS@IP:PORT/Streaming/Channels/2")

while(True):
     # Capture frame-by-frame
    ret, frame = cap.read()

    # Our operations on the frame come here
    #gray = cv2.cvtColor(frame, cv2.COLOR_BGR2GRAY)

    # Display the resulting frame
    cv2.imshow('Salida',frame)

    if cv2.waitKey(1) & 0xFF == ord('q'):
        break

# When everything done, release the capture 
cap.release() 
cv2.destroyAllWindows()

在窗口中查看： Get video from IPCAM with python and OpenCV