[Bug 210505] graphics/opencv: Update to 3.4

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=210505

Steve Wills <swills at FreeBSD.org> changed:

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--- Comment #64 from Steve Wills <swills at FreeBSD.org> ---
Created attachment 192856
  --> https://bugs.freebsd.org/bugzilla/attachment.cgi?id=192856&action=edit
opencv 3.4.1 update

Here's an updated version based on the previous patches.

It's updated to OpenCV 3.4.1. It builds and passes stage-qa tests on
12-CURRENT, 11.1 and 10.3 on amd64 and i386. I have not tested on other
architectures, but can and will try to do so soon.

It fixes the py-opencv and opencv-java ports. It enables the extra modules by
default so that libopencv_dnn is built, which seems to be required by
py-opencv. 

It enables ffmpeg support by default so that opencv can work on local files as
well as live video. In order to avoid a circular dependency, it disables opencv
support in ffmpeg by default. Perhaps we need to have a slave without ffmpeg
support so ffmpeg can depend on it. I'm unsure of the level of desire for that,
but if there's interest might be willing to work on that.

I have a port of PySceneDetect which uses the new OpenCV and in my testing the
updated py-opencv (and by extension opencv itself) seem to work well. I have
not done any runtime testing of opencv-java.

Given the number of ports that depend on opencv directly or indirectly, this
may need an exp-run before committing. I would appreciate any review or testing
anyone is willing to do. Of course, once this is committed I can commit
PySceneDetect.

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