[PD] pix_opencv error

[kubriel]

sorry for bothering, but i dont know, where to ask, and i spend all my
possibilities with google and testing.
i succesfully compiled pix_opencv, lot of objects is working well, but
the most important objects for optical flow instantly quit pd with this
output in terminal:

v4l2: VIDIOC_S_FMT: Invalid argument
OpenCV ERROR: Sizes of input arguments do not match ()
	in function cvCalcOpticalFlowBM, cvoptflowbm.cpp(592)
Terminating the application...
	called from cvUnregisterType, cxpersistence.cpp(4933)
Terminating the application...
	called from cvUnregisterType, cxpersistence.cpp(4933)
Terminating the application...
	called from cvUnregisterType, cxpersistence.cpp(4933)
Terminating the application...
	called from cvUnregisterType, cxpersistence.cpp(4933)
Terminating the application...
	called from cvUnregisterType, cxpersistence.cpp(4933)
Terminating the application...
	called from cvUnregisterType, cxpersistence.cpp(4933)
Terminating the application...
	called from cvUnregisterType, cxpersistence.cpp(4933)
Terminating the application...
	called from cvUnregisterType, cxpersistence.cpp(4933)
Terminating the application...
	called from cvUnregisterType, cxpersistence.cpp(4933)
Terminating the application...
pd_gui: pd process exited


it happens with pix_opencv_of_bm and pix_opencv_of_lk.
v4l2: VIDIOC_S_FMT: Invalid argument is written everytime i use webcam,
whis is perfectly working - so i dont know, if there is some
relationship between this errors..
everything on my ubuntu karmic amd64, and succesfully compiled Pd
version 0.42.5, and gem ver: 0.92.2
i will be very lucky if somebody has a clue, whats going on.
thanks,
kubriel