Re: [Playerstage-users] compatibility with OpenCV2.4.1 ?

[Rich M. <jp...@gm...>]

On Wed, Jan 16, 2013 at 8:17 AM, Dagna Bieda <dag...@gm...> wrote:

> Hi guys!
> Recently I've installed ubuntu on my new computer then I installed OpenCV
> 2.4.1 and it turned out that they changed their philosophy a bit and 2.4.1
> is not reverse compatible :/ Now they use using namespace cv; and all the
> functions don't have cv prefix anymore.
>
>
Player is compatible with OpenCV 2.4.  We've had it in Fedora since July
with no issues.  The old style C API still exists, the cv namespace is for
the new C++ API that's been introduced in parallel.


> When making player-3.0.2 I get following errors:
> libplayerdrivers/libplayerdrivers.so.3.0.2: undefined reference to
> `cvCreateImage'
> libplayerdrivers/libplayerdrivers.so.3.0.2: undefined reference to
> `cvLaplace'
>
>
The fact that you're seeing "undefined reference" errors means that Player
has already gotten past the step where it compiled all of its source
files.  That rules out any API issues (e.g. the cvCreateImage function
still exists in a header file somewhere.)  It's now trying to link against
OpenCV's libraries (libcv.so and friends) and failing.  This may be due to
having OpenCV on a non-standard path (like /usr/local) without properly
setting LD_LIBRARY_PATH.  Did you install OpenCV yourself, or did you use
packages provided by your distribution?

To debug further, we need:
* The location of libcv.so and the rest of the OpenCV libraries on your
system
* The output of CMake when you run it to build Player
* The full compiler command line that was run which produced the error
("make VERBOSE=1" will reveal it)

Rich