error: no type named 'channel_type' in 'cv::DataType<unsigned int>'

[freebooterish]

Attempting to build OpenFace-OpenFace_v0.2.5 on macOS the build fails with:

/usr/local/include/opencv2/core/mat.hpp:2150:37: error: no type named 'channel_type' in
'cv::DataType'
typedef typename DataType<_Tp>::channel_type channel_type;

[TadasBaltrusaitis]

Is OpenCV 3.1 installed on your system?

[freebooterish]

Yes, I installed the opencv-3.3.1 from source code with OPENCV_EXTRA_MODULES_PATH= "../opencv_contrib-3.3.1/modules"
When opencv3.3.1 is installed with brew install, the same errors still exists.

[ 75%] Built target LandmarkDetector
[ 76%] Building CXX object lib/local/FaceAnalyser/CMakeFiles/FaceAnalyser.dir/src/FaceAnalyser.cpp.o
In file included from /Volumes/data/test/OpenFace-OpenFace_v0.2.5/lib/local/FaceAnalyser/src/FaceAnalyser.cpp:35:
In file included from /Volumes/data/test/OpenFace-OpenFace_v0.2.5/lib/local/FaceAnalyser/./include/FaceAnalyser.h:44:
In file included from /usr/local/include/opencv2/core/core.hpp:48:
In file included from /usr/local/include/opencv2/core.hpp:59:
/usr/local/include/opencv2/core/mat.hpp:2150:37: error: no type named 'channel_type' in
'cv::DataType'
typedef typename DataType<_Tp>::channel_type channel_type;
~~~~~~~~~~~~~~~~~~~~~~~~^~~~~~~~~~~~

[linux-devil]

Make sure you link your opencv.

[TadasBaltrusaitis]

This might be an issue with OpenCV 3.3, which I have not tried yet. The main supported version of OpenCV for OpenFace is 3.1

[freebooterish]

It'OK after I installed opencv3.2.0 from source tar.

[JavierVillegas]

In Opencv 3.3 I had to uncomment the line
#define OPENCV_TRAITS_ENABLE_DEPRECATED
in traits.hpp

[TadasBaltrusaitis]

Thanks for the suggestions, once I move the code to OpenCV 3.3 I will need to adapt to the changes.