mjpg-streamer now with OpenCV input plugin (+filtering)

[Wishbonea]

I've been busy getting ready for competition, so I haven't had much time to work on this. I tried building Python 3.5.1 from source and installing it, but still almost the same error, though this time slightly different. Now instead of PyType_GenericNew being the undefined symbol, PyFloat_Type is, leading me to think that Python might not be exporting symbols correctly as nightpool suggested. So I tried adding -Xlinker -export-dynamic" to the cmake build flags through the MAKE_CXX_FLAGS variable. It didn't seem to have any effect, so I'm thinking I may have put it in the wrong cmake variable. Any idea what I might be doing wrong?

Bellow is a log of what I tried, hopefully it will help you!

pi@core2062pi:~/mjpg-streamer/mjpg-streamer-experimental/_build$ cmake .. -DPYTHON_EXECUTABLE=/usr/local/bin/python3.5 -DCMAKE_CXX_FLAGS="-Xlinker -export-dynamic"
-- The C compiler identification is GNU 4.9.2
-- The CXX compiler identification is GNU 4.9.2
-- Check for working C compiler: /usr/bin/cc
-- Check for working C compiler: /usr/bin/cc -- works
-- Detecting C compiler ABI info
-- Detecting C compiler ABI info - done
-- Check for working CXX compiler: /usr/bin/c++
-- Check for working CXX compiler: /usr/bin/c++ -- works
-- Detecting CXX compiler ABI info
-- Detecting CXX compiler ABI info - done
-- Looking for include file sys/inotify.h
-- Looking for include file sys/inotify.h - found
-- Found PythonLibs: /usr/local/lib/libpython3.5m.a (found version "3.5.1")
-- Found PythonInterp: /usr/local/bin/python3.5 (found version "3.5.1")
-- Found NUMPY: /usr/local/lib/python3.5/site-packages/numpy/core/include
-- Found components for NumPy
-- NUMPY_ROOT_DIR    = /usr/local
-- NUMPY_INCLUDES    = /usr/local/lib/python3.5/site-packages/numpy/core/include
-- NUMPY_LIBRARIES   =
-- NUMPY_API_VERSION = 1.11.0
-- Found PkgConfig: /usr/bin/pkg-config (found version "0.28")
-- checking for module 'libgphoto2'
--   package 'libgphoto2' not found
-- Could NOT find GPHOTO2 (missing:  GPHOTO2_LIBRARY GPHOTO2_INCLUDE_DIR)
-- Looking for include file linux/videodev2.h
-- Looking for include file linux/videodev2.h - found
-- Looking for include file pthread.h
-- Looking for include file pthread.h - found
-- Looking for pthread_create
-- Looking for pthread_create - not found
-- Looking for pthread_create in pthreads
-- Looking for pthread_create in pthreads - not found
-- Looking for pthread_create in pthread
-- Looking for pthread_create in pthread - found
-- Found Threads: TRUE
-- Could NOT find SDL (missing:  SDL_LIBRARY SDL_INCLUDE_DIR)
--
-- The following features have been enabled:

 * PLUGIN_INPUT_FILE , File input plugin
 * PLUGIN_INPUT_HTTP , HTTP input proxy plugin
 * PLUGIN_INPUT_OPENCV , OpenCV input plugin
 * PLUGIN_CVFILTER_CPP , OpenCV example filter
 * PLUGIN_CVFILTER_PY , OpenCV python filter
 * PLUGIN_INPUT_UVC , Video 4 Linux input plugin
 * PLUGIN_OUTPUT_FILE , File output plugin
 * PLUGIN_OUTPUT_HTTP , HTTP server output plugin
 * PLUGIN_OUTPUT_RTSP , RTSP output plugin
 * PLUGIN_OUTPUT_UDP , UDP output stream plugin

-- The following OPTIONAL packages have been found:

 * OpenCV
 * PythonLibs
 * PythonInterp
 * Numpy
 * Threads

-- The following features have been disabled:

 * WXP_COMPAT , Enable compatibility with WebcamXP
 * PLUGIN_INPUT_RASPICAM , Raspberry Pi input camera plugin (unmet dependencies)
 * PLUGIN_INPUT_PTP2 , PTP2 input plugin (unmet dependencies)
 * ENABLE_HTTP_MANAGEMENT , Enable experimental HTTP management option
 * PLUGIN_OUTPUT_VIEWER , SDL output viewer plugin (unmet dependencies)

-- The following OPTIONAL packages have not been found:

 * Gphoto2
 * SDL

-- Configuring done
-- Generating done
-- Build files have been written to: /home/pi/mjpg-streamer/mjpg-streamer-experimental/_build
pi@core2062pi:~/mjpg-streamer/mjpg-streamer-experimental/_build$ make
Scanning dependencies of target mjpg_streamer
[  5%] Building C object CMakeFiles/mjpg_streamer.dir/mjpg_streamer.c.o
[ 10%] Building C object CMakeFiles/mjpg_streamer.dir/utils.c.o
Linking C executable mjpg_streamer
[ 10%] Built target mjpg_streamer
Scanning dependencies of target input_file
[ 15%] Building C object plugins/input_file/CMakeFiles/input_file.dir/input_file.c.o
Linking C shared library input_file.so
[ 15%] Built target input_file
Scanning dependencies of target input_http
[ 21%] Building C object plugins/input_http/CMakeFiles/input_http.dir/input_http.c.o
[ 26%] Building C object plugins/input_http/CMakeFiles/input_http.dir/misc.c.o
[ 31%] Building C object plugins/input_http/CMakeFiles/input_http.dir/mjpg-proxy.c.o
Linking C shared library input_http.so
[ 31%] Built target input_http
Scanning dependencies of target input_opencv
[ 36%] Building CXX object plugins/input_opencv/CMakeFiles/input_opencv.dir/input_opencv.cpp.o
Linking CXX shared library input_opencv.so
[ 36%] Built target input_opencv
Scanning dependencies of target cvfilter_cpp
[ 42%] Building CXX object plugins/input_opencv/filters/cvfilter_cpp/CMakeFiles/cvfilter_cpp.dir/filter_cpp.cpp.o
Linking CXX shared library cvfilter_cpp.so
[ 42%] Built target cvfilter_cpp
Scanning dependencies of target cvfilter_py
[ 47%] Building CXX object plugins/input_opencv/filters/cvfilter_py/CMakeFiles/cvfilter_py.dir/filter_py.cpp.o
[ 52%] Building CXX object plugins/input_opencv/filters/cvfilter_py/CMakeFiles/cvfilter_py.dir/conversion.cpp.o
Linking CXX shared library cvfilter_py.so
[ 52%] Built target cvfilter_py
Scanning dependencies of target input_uvc
[ 57%] Building C object plugins/input_uvc/CMakeFiles/input_uvc.dir/dynctrl.c.o
[ 63%] Building C object plugins/input_uvc/CMakeFiles/input_uvc.dir/input_uvc.c.o
[ 68%] Building C object plugins/input_uvc/CMakeFiles/input_uvc.dir/jpeg_utils.c.o
[ 73%] Building C object plugins/input_uvc/CMakeFiles/input_uvc.dir/v4l2uvc.c.o
Linking C shared library input_uvc.so
[ 73%] Built target input_uvc
Scanning dependencies of target output_file
[ 78%] Building C object plugins/output_file/CMakeFiles/output_file.dir/output_file.c.o
Linking C shared library output_file.so
[ 78%] Built target output_file
Scanning dependencies of target output_http
[ 84%] Building C object plugins/output_http/CMakeFiles/output_http.dir/httpd.c.o
[ 89%] Building C object plugins/output_http/CMakeFiles/output_http.dir/output_http.c.o
Linking C shared library output_http.so
[ 89%] Built target output_http
Scanning dependencies of target output_rtsp
[ 94%] Building C object plugins/output_rtsp/CMakeFiles/output_rtsp.dir/output_rtsp.c.o
Linking C shared library output_rtsp.so
[ 94%] Built target output_rtsp
Scanning dependencies of target output_udp
[100%] Building C object plugins/output_udp/CMakeFiles/output_udp.dir/output_udp.c.o
Linking C shared library output_udp.so
[100%] Built target output_udp
pi@core2062pi:~/mjpg-streamer/mjpg-streamer-experimental/_build$ cd ..
pi@core2062pi:~/mjpg-streamer/mjpg-streamer-experimental$ sudo make install
make -C _build install
make[1]: Entering directory '/home/pi/mjpg-streamer/mjpg-streamer-experimental/_build'
make[2]: Entering directory '/home/pi/mjpg-streamer/mjpg-streamer-experimental/_build'
make[3]: Entering directory '/home/pi/mjpg-streamer/mjpg-streamer-experimental/_build'
make[3]: Leaving directory '/home/pi/mjpg-streamer/mjpg-streamer-experimental/_build'
[ 10%] Built target mjpg_streamer
make[3]: Entering directory '/home/pi/mjpg-streamer/mjpg-streamer-experimental/_build'
make[3]: Leaving directory '/home/pi/mjpg-streamer/mjpg-streamer-experimental/_build'
[ 15%] Built target input_file
make[3]: Entering directory '/home/pi/mjpg-streamer/mjpg-streamer-experimental/_build'
make[3]: Leaving directory '/home/pi/mjpg-streamer/mjpg-streamer-experimental/_build'
[ 31%] Built target input_http
make[3]: Entering directory '/home/pi/mjpg-streamer/mjpg-streamer-experimental/_build'
make[3]: Leaving directory '/home/pi/mjpg-streamer/mjpg-streamer-experimental/_build'
[ 36%] Built target input_opencv
make[3]: Entering directory '/home/pi/mjpg-streamer/mjpg-streamer-experimental/_build'
make[3]: Leaving directory '/home/pi/mjpg-streamer/mjpg-streamer-experimental/_build'
[ 42%] Built target cvfilter_cpp
make[3]: Entering directory '/home/pi/mjpg-streamer/mjpg-streamer-experimental/_build'
make[3]: Leaving directory '/home/pi/mjpg-streamer/mjpg-streamer-experimental/_build'
[ 52%] Built target cvfilter_py
make[3]: Entering directory '/home/pi/mjpg-streamer/mjpg-streamer-experimental/_build'
make[3]: Leaving directory '/home/pi/mjpg-streamer/mjpg-streamer-experimental/_build'
[ 73%] Built target input_uvc
make[3]: Entering directory '/home/pi/mjpg-streamer/mjpg-streamer-experimental/_build'
make[3]: Leaving directory '/home/pi/mjpg-streamer/mjpg-streamer-experimental/_build'
[ 78%] Built target output_file
make[3]: Entering directory '/home/pi/mjpg-streamer/mjpg-streamer-experimental/_build'
make[3]: Leaving directory '/home/pi/mjpg-streamer/mjpg-streamer-experimental/_build'
[ 89%] Built target output_http
make[3]: Entering directory '/home/pi/mjpg-streamer/mjpg-streamer-experimental/_build'
make[3]: Leaving directory '/home/pi/mjpg-streamer/mjpg-streamer-experimental/_build'
[ 94%] Built target output_rtsp
make[3]: Entering directory '/home/pi/mjpg-streamer/mjpg-streamer-experimental/_build'
make[3]: Leaving directory '/home/pi/mjpg-streamer/mjpg-streamer-experimental/_build'
[100%] Built target output_udp
make[2]: Leaving directory '/home/pi/mjpg-streamer/mjpg-streamer-experimental/_build'
Install the project...
-- Install configuration: "Release"
-- Up-to-date: /usr/local/bin/mjpg_streamer
-- Installing: /usr/local/share/mjpg-streamer/www
-- Up-to-date: /usr/local/share/mjpg-streamer/www/rotateicons.png
-- Up-to-date: /usr/local/share/mjpg-streamer/www/bodybg.gif
-- Up-to-date: /usr/local/share/mjpg-streamer/www/stream_simple.html
-- Up-to-date: /usr/local/share/mjpg-streamer/www/cambozola.jar
-- Up-to-date: /usr/local/share/mjpg-streamer/www/jquery.ui.tabs.min.js
-- Up-to-date: /usr/local/share/mjpg-streamer/www/control.htm
-- Up-to-date: /usr/local/share/mjpg-streamer/www/jquery.ui.core.min.js
-- Up-to-date: /usr/local/share/mjpg-streamer/www/static_simple.html
-- Up-to-date: /usr/local/share/mjpg-streamer/www/favicon.ico
-- Up-to-date: /usr/local/share/mjpg-streamer/www/javascript_motiondetection.html
-- Up-to-date: /usr/local/share/mjpg-streamer/www/jquery.js
-- Up-to-date: /usr/local/share/mjpg-streamer/www/java.html
-- Up-to-date: /usr/local/share/mjpg-streamer/www/javascript_simple.html
-- Up-to-date: /usr/local/share/mjpg-streamer/www/jquery.rotate.js
-- Up-to-date: /usr/local/share/mjpg-streamer/www/spinbtn_updn.gif
-- Up-to-date: /usr/local/share/mjpg-streamer/www/java_control.html
-- Up-to-date: /usr/local/share/mjpg-streamer/www/java_simple.html
-- Up-to-date: /usr/local/share/mjpg-streamer/www/stream.html
-- Up-to-date: /usr/local/share/mjpg-streamer/www/static.html
-- Up-to-date: /usr/local/share/mjpg-streamer/www/videolan.html
-- Up-to-date: /usr/local/share/mjpg-streamer/www/LICENSE.txt
-- Up-to-date: /usr/local/share/mjpg-streamer/www/index.html
-- Up-to-date: /usr/local/share/mjpg-streamer/www/JQuerySpinBtn.css
-- Up-to-date: /usr/local/share/mjpg-streamer/www/functions.js
-- Up-to-date: /usr/local/share/mjpg-streamer/www/favicon.png
-- Up-to-date: /usr/local/share/mjpg-streamer/www/sidebarbg.gif
-- Up-to-date: /usr/local/share/mjpg-streamer/www/example.jpg
-- Up-to-date: /usr/local/share/mjpg-streamer/www/jquery.ui.widget.min.js
-- Up-to-date: /usr/local/share/mjpg-streamer/www/fix.css
-- Up-to-date: /usr/local/share/mjpg-streamer/www/jquery.ui.custom.css
-- Up-to-date: /usr/local/share/mjpg-streamer/www/JQuerySpinBtn.js
-- Up-to-date: /usr/local/share/mjpg-streamer/www/style.css
-- Up-to-date: /usr/local/share/mjpg-streamer/www/javascript.html
-- Up-to-date: /usr/local/lib/mjpg-streamer/input_file.so
-- Up-to-date: /usr/local/lib/mjpg-streamer/input_http.so
-- Up-to-date: /usr/local/lib/mjpg-streamer/input_opencv.so
-- Up-to-date: /usr/local/lib/mjpg-streamer/cvfilter_cpp.so
-- Up-to-date: /usr/local/lib/mjpg-streamer/cvfilter_py.so
-- Up-to-date: /usr/local/lib/mjpg-streamer/input_uvc.so
-- Up-to-date: /usr/local/lib/mjpg-streamer/output_file.so
-- Up-to-date: /usr/local/lib/mjpg-streamer/output_http.so
-- Up-to-date: /usr/local/lib/mjpg-streamer/output_rtsp.so
-- Up-to-date: /usr/local/lib/mjpg-streamer/output_udp.so
make[1]: Leaving directory '/home/pi/mjpg-streamer/mjpg-streamer-experimental/_build'
pi@core2062pi:~/mjpg-streamer/mjpg-streamer-experimental$ export LD_LIBRARY_PATH=.
pi@core2062pi:~/mjpg-streamer/mjpg-streamer-experimental$ sudo ./mjpg_streamer -i "input_opencv.so --filter cvfilter_py.so --fargs ~/mjpg-streamer/mjpg-streamer-experimental/plugins/input_opencv/filters/cvfilter_py/example_filter.py" -o "output_http.so -w ./www"
MJPG Streamer Version: svn rev: 2016.3.0
 i: device........... : default
 i: Desired Resolution: 640 x 480
 i: filter........... : cvfilter_py.so
 i: filter args ..... : ~/mjpg-streamer/mjpg-streamer-experimental/plugins/input_opencv/filters/cvfilter_py/example_filter.py
['/usr/local/lib/python35.zip', '/usr/local/lib/python3.5', '/usr/local/lib/python3.5/plat-linux', '/usr/local/lib/python3.5/lib-dynload', '/usr/local/lib/python3.5/site-packages']
Traceback (most recent call last):
  File "/usr/local/lib/python3.5/site-packages/numpy/__init__.py", line 180, in <module>
    from . import add_newdocs
  File "/usr/local/lib/python3.5/site-packages/numpy/add_newdocs.py", line 13, in <module>
    from numpy.lib import add_newdoc
  File "/usr/local/lib/python3.5/site-packages/numpy/lib/__init__.py", line 3, in <module>
    import math
ImportError: /usr/local/lib/python3.5/lib-dynload/math.cpython-35m-arm-linux-gnueabihf.so: undefined symbol: PyFloat_Type
ImportError: numpy.core.multiarray failed to import
Error loading numpy!

This was done on a Debian Minbian install on a Raspberry Pi 3 with Python 3.5.1, Numpy 1.11.0, and Open CV 3.1.0.