TypeError: cv.VideoWriter is not a constructor

[MathieuRS1]

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Hi,

I have this error,

TypeError: cv.VideoWriter is not a constructor

on trying the following example node-opencv/examples/write-video.js

And I don't understand why :(

Thank you, Mathieu

[MathieuRS1]

Ok you need to install the available-modules branch to use these functions.

npm install [...].git#available-modules

[acwang8880]

Can you elaborate what steps you took to resolve the issue? Thank you!!

[btsimonh]

available modules is now in the master branch; but you will need to install from github; npm is vanilla 6.0.0 which may not have the support.

npm install peterbraden/node-opencv

be aware that VideoWriter depends upon 'HAVE_OPENCV_VIDEOIO' - so this must have been set in the build of OpenCV itself, else it will be excluded when node-opencv builds.

using a relative std OpenCV 3.3.0 built with opencv-contrib, I successfully use:

    writer = new cv.VideoWriter(filename, 'MP42' /*'DIVX'*/, FPS, msg.camera.size(), true);    

which seems to produce mpeg4 in AVI relatively efficiently on an RPi3.

In terms of building opencv, I roughly documented what i did here node-opencv-with-node-red, in case it's any use