[blfs-support] gst-plugins-bad-1.0 does not build if opencv is present
pierre.labastie at neuf.fr
Thu Dec 22 07:06:50 PST 2016
On 22/12/2016 14:59, Douglas R. Reno wrote:
> On Thu, Dec 22, 2016 at 6:58 AM, Pierre Labastie
> <pierre.labastie at neuf.fr <mailto:pierre.labastie at neuf.fr>> wrote:
> I am amazed that nobody came to that earlier, but if
> opencv-3.1.0 is installed as per the book instructions,
> gst-plugins-bad does not build. The error is:
> make: Entering directory
> CXX libgstopencv_la-gstopencv.lo
> In file included from gstopencv.cpp:41:0:
> gstsegmentation.h:53:32: fatal error: opencv2/bgsegm.hpp: No such
> file or
> #include <opencv2/bgsegm.hpp>
> compilation terminated.
> make: *** [Makefile:1016: libgstopencv_la-gstopencv.lo] Error 1
> After much research (I'm really not good at finding
> things on internet, thanks Arch linux), I found that
> the bgsegm module is from the opencv_contrib
> package, and not included in the main opencv
> package (there is a cudabgsegm module in the
> main pacakge, but not available if not using cuda,
> that is, nvidia proprietary graphics driver). I have
> not yet tried to build the opencv_contrib package,
> nor to build gst-plugins-bad with that package
> installed. But I wanted to report to see whether
> anybody could confirm. I'd say that if confirmed,
> we should add the opencv_contrib package as
> optional (or disable gstopencv in gst-plugins-bad).
> Hi Pierre,
> I generally don't build OpenCV when updating gst-plugins-bad, as most
> of the time I'm heading towards GNOME and need the gst plugins as
> If you want me to confirm, I'll be building through gst-plugins-* in a
> couple hours, so that I can build WebkitGTK+. I can try building
> OpenCV this time if you want.
> Otherwise, my two cents is to disable gstopencv, but I can see where
> adding the contrib package could help. I just don't see too much of a
> use for OpenCV in gst-plugins-bad currently.
I'd say it would allow to build some image recognition module... Whether
it is useful (for cheese or whatever), I can't tell.
Problem is: opencv is in the in the optional deps of gst-plugins-bad, so
users may build it, for whatever reason [*]. In this case
gst-plugins-base does not build. OTOH, BLFS editors are not supposed to
test building with optional deps.
So, I might just disable opencv in gstreamer, and add a command
explanation telling that extra modules are needed if users want to
[*] I've bought a webcam, as advised by you ;-), but cheese is unable to
access it, so I thought I would rebuild gst-plugins with all deps to
make sure I have the right ones. The book is not very explicit about
which deps are needed for which usage...
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