Building mediapipe with custom OpenCV path

[siquus]

I am using Archlinux with OpenCV in /usr/local/include, /usr/local/lib. I haven't found documentation on how to change the OpenCV default directories used by mediapipe. The build error says that the <opencv2/...> include files can't be found. The solutions I found online, like adding

copts = ["-I/usr/local/include/opencv4/"]

to opencv_linux.BUILD do not work. Using --define=OPENCV=source fails because some enums are not defined.

Could you please add some documentation on how to set the OpenCV path manually? Thanks!

[ghost]

Did you check https://google.github.io/mediapipe/getting_started/install.html, there are multiple options to setting up OpenCV.

[siquus]

Ah..sorry about that. For what it's worth, here are the steps necessary to build mediapipe on Archlinux:

OpenCV

1. Some special opencv_contrib modules are required which are not built by default by OpenCV. Following the commands from mediapipe/setup_opencv.sh works. I used OpenCV's default "4.x" branches for both repositories rather than the "3.4" from the file.
2. In mediapipe's install instructions, scroll down to "OpenCV 4 setup" and change mediapipe/WORKSPACE and mediapipe/thirdparty/opencv_linux.BUILD accordingly.

Bazel

1. change mediapipe/.bazelversion to contain the version your system is using (I used 5.3.2)
2. Bazel has known issues with openjdk17. The workaround mentioned in that issue, adding --host_jvm_args="--add-opens=java.base/java.lang=ALL-UNNAMED", works for me.

Compiling

bazel --host_jvm_args="--add-opens=java.base/java.lang=ALL-UNNAMED" build -c opt --define MEDIAPIPE_DISABLE_GPU=1 mediapipe/examples/desktop/hand_tracking:hand_tracking_cpu

[google-ml-butler]

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