[android-opencv] [OpenCV4Android] onCameraFrame gives a mat without a height value?

I'm trying to convert the mat I receive in the method onCameraFrame(Mat
inputMat){} to a Bitmap using opencv.android.Utils.matToBitmap

That method requires input of the mat and a bitmap of the same size. To
create a bitmap of the same size, I am accessing the mat's width and height
(I have also tried rows and cols).

The height/rows value always returns as 0. The width returns 640, the
correct value.

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