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using MinGW (tdm-1) 5.1.0 which was shipped along with codeblocks.

that's usually an unfortunate decision, it's amazing, that it even compiled. (that's 32bit only, right ?)

imho you should try to get a more modern mingw64 (it all works nicely here, using mingw64 7.2.0, the seh version)

and rebuild the opencv libs using cmake flags:

 -DENABLE_PRECOMPILED_HEADERS=OFF
 -DWITH_MSMF=OFF
 -DWITH_IPP=OFF
 -DCPU_DISPATCH=""       (leave empty)

using MinGW (tdm-1) 5.1.0 which was shipped along with codeblocks.

that's usually an unfortunate decision, it's amazing, that it even compiled. (that's 32bit only, right ?)

imho you should try to get a more modern mingw64 (it all works nicely here, using mingw64 7.2.0, the seh version)

and rebuild the opencv libs using cmake flags:

 -DENABLE_PRECOMPILED_HEADERS=OFF
 -DWITH_MSMF=OFF
 -DWITH_IPP=OFF
 -DCPU_DISPATCH=""       (leave empty)

good luck !