IP camera Python error

问题:

I am trying to access a video from an IP camera. I am using OpenCV and Python to do so. The code that I have tried is given below:

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

On running this code the output that I am getting is:

Image not converted

On using another method, CaptureFromCAM instead of CaptureFromFile the code is:

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)

When I run this code the error I am getting is:

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

I read about it, and the SampleCB() error is in the case when the buffer size does not match the expected input size. I tried to change the streaming resolution, but nothing seems to work. I followed this thread and this thread. They are giving the C++ code and on conversion to Python (the code given above) it does not work. Or the thread gives the code for motion detection. I am using Windows 7 and Eclipse with Pydev for development. What do I do?

回答1:

Oh, please stick with the cv2 API. The old cv one is no more available in current OpenCV versions:

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

回答2:

Look this example with python and 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()

See in the window: Get video from IPCAM with python and OpenCV