Video io, 'get' not working with OpenCv

[Christoph Gohlke]

Correction: OpenCV 2.3.1 provides a compatibility module, cv.py, which 
does `from cv2.cv import *`. So this is not the problem.

Christoph


On 12/17/2011 4:34 PM, Christoph Gohlke wrote:
> I don't think skimage 0.4.2 works with OpenCv 2.3.1.  Video.py tries 
> `import cv` but in OpenCv 2.3.1 the cv module was moved to cv2.cv. Try 
> change `import cv` to `from cv2 import cv` in video.py.
>
> Christoph
>
>
> On 12/17/2011 7:50 AM, robbert wrote:
>> Hi All,
>>
>> I've wrote a little test program to a extract a frame of a video file 
>> (for processing), but I can't get it work.
>> The video file is a compressed avi file, and can be played by the 
>> camshift.py demo of OpenCv.
>> So I think the OpenCv bindings for python are installed correctly.
>>
>> import skimage
>> from skimage.io import Video
>> vid = Video('c:\\test.avi')
>> frame0 = vid.get()
>>
>> However the above test program gives the following error:
>>
>> Traceback (most recent call last):
>>   File "C:\prog\skimage-test.py", line 8, in <module>
>>     frame0 = vid.get()
>>   File 
>> "C:\Python\lib\site-packages\scikits_image-0.4.2-py2.6-win32.egg\skimage\io\video.py", 
>> line 279, in get
>>     return self.video.get()
>>   File 
>> "C:\Python\lib\site-packages\scikits_image-0.4.2-py2.6-win32.egg\skimage\io\video.py", 
>> line 54, in get
>>     cv.Copy(img, img_mat)
>> TypeError: CvArr argument 'dst' must be IplImage, CvMat or CvMatND. 
>> Use fromarray() to convert numpy arrays to CvMat or cvMatND
>>
>> I used the following versions of the software
>> Python 2.6.4
>> Numpy 1.6.1
>> Scipy 0.9.0
>> skimage 0.4.2
>> OpenCv  2.3.1    (Rev: 4557)
>> PyQt 4.6.2
>> WinXp Sp3
>>
>> Am I doing something wrong? Or is there just a specific version of 
>> OpenCv required?
>> Note that OpenCv isn't on the (optional) requirements list.
>>
>> I also tried to install the alternative backend, gstreamer+python 
>> bindings, but under windows this seems to be troublesome.
>>
>>
>> kind regards,
>>
>> Robbert
>>
>>
>