On 22/12/2016 14:59, Douglas R. Reno wrote:
On Thu, Dec 22, 2016 at 6:58 AM, Pierre Labastie
<[email protected] <mailto:[email protected]>> wrote:
Hi,
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[3]: Entering directory
'/sources/gst10-plugins-bad/gst-plugins-bad-1.10.2/ext/opencv'
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
directory
#include <opencv2/bgsegm.hpp>
^
compilation terminated.
make[3]: *** [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).
Regards,
Pierre
Regards
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
dependencies.
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
enable it.
[*] 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...
Pierre
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