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I am having trouble enabling gstreamer support for the opencv python package (cv2). gstreamer1.0 is running fine as a standalone and I have manually built the cv2 python package from the OpenCV sources.

import cv2
print(cv2.getBuildInformation())

prints:

Video I/O:
    ...
    GStreamer: NO
    ...

I ensured WITH_GSTREAMER was set to ON during ccmake. Not sure whats left for me to try. Can anyone help?

Here is a link to my related stack overlflow post.

Thanks!

Edit: I did a

cmake .. -DWITH_GSTREAMER=ON

to have some cmake output that I can post. Not sure if the command I am using will actually replicate what I have done using ccmake. Anyway, here is the output

    -- Looking for ccache - not found
-- Found ZLIB: /usr/lib/x86_64-linux-gnu/libz.so (found suitable version "1.2.8", minimum required is "1.2.3") 
-- Could NOT find TIFF (missing:  TIFF_LIBRARY TIFF_INCLUDE_DIR) 
-- Could NOT find Jasper (missing:  JASPER_LIBRARIES JASPER_INCLUDE_DIR) 
-- Found ZLIB: /usr/lib/x86_64-linux-gnu/libz.so (found version "1.2.8") 
-- Could NOT find PNG (missing:  PNG_LIBRARY PNG_PNG_INCLUDE_DIR) 
-- Checking for module 'gtk+-3.0'
--   No package 'gtk+-3.0' found
-- Checking for module 'gtk+-2.0'
--   No package 'gtk+-2.0' found
-- Checking for module 'gstreamer-base-0.10'
--   No package 'gstreamer-base-0.10' found
-- Checking for module 'gstreamer-video-0.10'
--   No package 'gstreamer-video-0.10' found
-- Checking for module 'gstreamer-app-0.10'
--   No package 'gstreamer-app-0.10' found
-- Checking for module 'gstreamer-riff-0.10'
--   No package 'gstreamer-riff-0.10' found
-- Checking for module 'gstreamer-pbutils-0.10'
--   No package 'gstreamer-pbutils-0.10' found
-- Checking for module 'libdc1394-2'
--   No package 'libdc1394-2' found
-- Checking for module 'libdc1394'
--   No package 'libdc1394' found
-- Looking for linux/videodev.h
-- Looking for linux/videodev.h - not found
-- Looking for linux/videodev2.h
-- Looking for linux/videodev2.h - found
-- Looking for sys/videoio.h
-- Looking for sys/videoio.h - not found
-- Checking for modules 'libavcodec;libavformat;libavutil;libswscale'
--   No package 'libavcodec' found
--   No package 'libavformat' found
--   No package 'libavutil' found
--   No package 'libswscale' found
-- Checking for module 'libavresample'
--   No package 'libavresample' found
-- found Intel IPP (ICV version): 2019.0.0 [2019.0.0 Gold]
-- at: /home/basti/Downloads/opencv-3.4.5/build/3rdparty/ippicv/ippicv_lnx/icv
-- found Intel IPP Integration Wrappers sources: 2019.0.0
-- at: /home/basti/Downloads/opencv-3.4.5/build/3rdparty/ippicv/ippicv_lnx/iw
-- Could not find OpenBLAS lib. Turning OpenBLAS_FOUND off
-- Could NOT find Atlas (missing:  Atlas_CLAPACK_INCLUDE_DIR Atlas_CBLAS_LIBRARY Atlas_BLAS_LIBRARY) 
-- A library with BLAS API found.
-- A library with LAPACK API found.
-- Could NOT find JNI (missing:  JAVA_INCLUDE_PATH JAVA_INCLUDE_PATH2 JAVA_AWT_INCLUDE_PATH) 
-- VTK is not found. Please set -DVTK_DIR in CMake to VTK build directory, or to VTK install subdirectory with VTKConfig.cmake file
-- OpenCV Python: during development append to PYTHONPATH: /home/basti/Downloads/opencv-3.4.5/build/python_loader
-- 
-- General configuration for OpenCV 3.4.5 =====================================
--   Version control:               unknown
-- 
--   Platform:
--     Timestamp:                   2019-01-08T15:50:13Z
--     Host:                        Linux 4.13.0-36-generic x86_64
--     CMake:                       3.5.1
--     CMake generator:             Unix Makefiles
--     CMake build tool:            /usr/bin/make
--     Configuration:               Release
-- 
--   CPU/HW features:
--     Baseline:                    SSE SSE2 SSE3
--       requested:                 SSE3
--     Dispatched code generation:  SSE4_1 SSE4_2 FP16 AVX AVX2 AVX512_SKX ...