Pedro Nogueira's profile - activity

Hi, I am developing a image analysis software with opencv (runs in both 2.4.11 and 3.0). I use it with webcams without problems but I tried to use a Avermedia C874 video capture device. Under windows the software recognizes "Avermedia USB HD Capture" as a video device, but when I choose it, the function (in java):

  VideoCapture capture = new VideoCapture( -1); 

  Thread.sleep(1000); // Wait for video to start

The call...

capture.isOpened();

returns always false. Does anyone knw a solution to capture frames from this device?

By the way I tried it also in linux and it also does not recognize the board. Thanks for your answers, PN

GNU Make 3.82.90

After downloading the latest version (3) from Github and runing with the cmake and mingw32-make instruction (including renaming sh.exe) everuthing worked fine.

Hi there,

While compiling I get this error:

[ 29%] Building CXX object modules/highgui/CMakeFiles/opencv_highgui.dir/src/window_w32.cpp.obj
F:\Transferencias\opencv\sources\modules\highgui\src\window_w32.cpp:1:0: warning: -fPIC ignored for target (all code is position independent) [enabled by default]
 /*M///////////////////////////////////////////////////////////////////////////////////////
 ^
F:\Transferencias\opencv\sources\modules\highgui\src\window_w32.cpp: In function 'int icvCreateTrackbar(const char*, const char*, int*, int, CvTrackbarCallback, CvTrackbarCallback2, void*)':
F:\Transferencias\opencv\sources\modules\highgui\src\window_w32.cpp:1853:81: error: 'BTNS_AUTOSIZE' was not declared in this scope
                                         WS_CHILD | CCS_TOP | TBSTYLE_WRAPABLE | BTNS_AUTOSIZE | BTNS_BUTTON,
                                                                                 ^
F:\Transferencias\opencv\sources\modules\highgui\src\window_w32.cpp:1853:97: error: 'BTNS_BUTTON' was not declared in this scope
                                         WS_CHILD | CCS_TOP | TBSTYLE_WRAPABLE | BTNS_AUTOSIZE | BTNS_BUTTON,
                                                                                                 ^
modules\highgui\CMakeFiles\opencv_highgui.dir\build.make:187: recipe for target 'modules/highgui/CMakeFiles/opencv_highgui.dir/src/window_w32.cpp.obj' failed
mingw32-make[2]: *** [modules/highgui/CMakeFiles/opencv_highgui.dir/src/window_w32.cpp.obj] Error 1
CMakeFiles\Makefile2:2230: recipe for target 'modules/highgui/CMakeFiles/opencv_highgui.dir/all' failed
mingw32-make[1]: *** [modules/highgui/CMakeFiles/opencv_highgui.dir/all] Error 2
Makefile:159: recipe for target 'all' failed
mingw32-make: *** [all] Error 2

Any sugestions? Thanks, PN