OpenCV WebAssembly

Question

I try to run this tutorial, http://videocortex.io/2017/opencv-web-app/ , to build and try out OpenCV WebAssembly. But I can´t get over step "The Build System" I´ve build emscripten 1.38.21, installed Python 2.7.5.3_64bit and CMAKE 3.13.2 but get an error in the end:

Did I missed something?

When I run emcc -v I get some error´s also:

WARNING:root:LLVM version appears incorrect (seeing "6.0", expected "3.7") ERROR:root:Emscripten, llvm and clang versions do not match, this is dangerous (1.35.0, "1.38.21", "1.38.21") ERROR:root:Make sure to use the same branch in each repo, and to be up-to-date on each. See http://kripken.github.io/emscripten-site/docs/building_from_source/LLVM-Backend.html INFO:root:(Emscripten: Running sanity checks) emcc (Emscripten gcc/clang-like replacement + linker emulating GNU ld) 1.35.0 clang version 6.0.1 (emscripten 1.38.21 : 1.38.21) Target: x86_64-pc-windows-msvc Thread model: posix InstalledDir: D:\\Repositories\\emsdk\\clang\\e1.38.21_64bit WARNING:root:LLVM version appears incorrect (seeing "6.0", expected "3.7") ERROR:root:Emscripten, llvm and clang versions do not match, this is dangerous (1.35.0, "1.38.21", "1.38.21") ERROR:root:Make sure to use the same branch in each repo, and to be up-to-date on each. See http://kripken.github.io/emscripten-site/docs/building_from_source/LLVM-Backend.html INFO:root:(Emscripten: Running sanity checks)

Answer 1

Someone has successfully compiled OpenCV to WebAssembly. You can visit the GitHub repository and follow the steps:

1. Get the source code:
   git clone https://github.com/ucisysarch/opencvjs.git cd opencvjs git clone https://github.com/opencv/opencv cd opencv git checkout 3.1.0
2. Install Emscripten: ./emsdk update ./emsdk install sdk-incoming-64bit --shallow ./emsdk activate sdk-incoming-64bit source ./emsdk_env.sh
3. Build OpenCV to WebAssembly. python make.py --wasm