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I am trying to compile opencv on Slackware 4.1. However I encountered the following error each time.
In file included from /usr/include/gstreamer-0.10/gst/pbutils/encoding-profile.h:29:0,
from /tmp/SBo/opencv-2.4.11/modules/highgui/src/cap_gstreamer.cpp:65:
/usr/include/gstreamer-0.10/gst/pbutils/gstdiscoverer.h:35:9: error: 'GstMiniObjectClass' does not name a type
typedef GstMiniObjectClass GstDiscovererStreamInfoClass;
/usr/include/gstreamer-0.10/gst/pbutils/gstdiscoverer.h:83:9: error: 'GstMiniObjectClass' does not name a type
typedef GstMiniObjectClass GstDiscovererContainerInfoClass;
/usr/include/gstreamer-0.10/gst/pbutils/gstdiscoverer.h:104:9: error: 'GstMiniObjectClass' does not name a type
typedef GstMiniObjectClass GstDiscovererAudioInfoClass;
^
/usr/include/gstreamer-0.10/gst/pbutils/gstdiscoverer.h:129:9: error: 'GstMiniObjectClass' does not name a type
typedef GstMiniObjectClass GstDiscovererVideoInfoClass;
^
/usr/include/gstreamer-0.10/gst/pbutils/gstdiscoverer.h:159:9: error: 'GstMiniObjectClass' does not name a type
typedef GstMiniObjectClass GstDiscovererSubtitleInfoClass;
^
/usr/include/gstreamer-0.10/gst/pbutils/gstdiscoverer.h:202:9: error: 'GstMiniObjectClass' does not name a type
typedef GstMiniObjectClass GstDiscovererInfoClass;
^
In file included from /tmp/SBo/opencv-2.4.11/modules/highgui/src/cap_gstreamer.cpp:65:0:
/usr/include/gstreamer-0.10/gst/pbutils/encoding-profile.h:47:9: error: 'GstMiniObjectClass' does not name a type
typedef GstMiniObjectClass GstEncodingProfileClass;
^
/usr/include/gstreamer-0.10/gst/pbutils/encoding-profile.h:66:9: error: 'GstEncodingProfileClass' does not name a type
typedef GstEncodingProfileClass GstEncodingContainerProfileClass;
^
/usr/include/gstreamer-0.10/gst/pbutils/encoding-profile.h:85:9: error: 'GstEncodingProfileClass' does not name a type
typedef GstEncodingProfileClass GstEncodingVideoProfileClass;
^
/usr/include/gstreamer-0.10/gst/pbutils/encoding-profile.h:104:9: error: 'GstEncodingProfileClass' does not name a type
typedef GstEncodingProfileClass GstEncodingAudioProfileClass;
^
/tmp/SBo/opencv-2.4.11/modules/highgui/src/cap_gstreamer.cpp: In member function 'virtual bool CvCapture_GStreamer::grabFrame()':
/tmp/SBo/opencv-2.4.11/modules/highgui/src/cap_gstreamer.cpp:232:57: error: 'gst_app_sink_pull_sample' was not declared in this scope
sample = gst_app_sink_pull_sample(GST_APP_SINK(sink));
^
make[2]: *** [modules/highgui/CMakeFiles/opencv_highgui.dir/src/cap_gstreamer.cpp.o] Error 1
The configuration report for the compilation is as follows:
-- General configuration for OpenCV 2.4.11 =====================================
-- Version control: unknown
--
-- Platform:
-- Host: Linux 3.10.17 i686
-- CMake: 2.8.12
-- CMake generator: Unix Makefiles
-- CMake build tool: /usr/bin/gmake
-- Configuration: Release
--
-- C/C++:
-- Built as dynamic libs?: YES
-- C++ Compiler: /usr/bin/c++ (ver 4.8.2)
-- C++ flags (Release): -O2 -march=i486 -mtune=i686 -fsigned-char -W -Wall -Werror=return-type -Werror=address -Werror=sequence-point -Wformat -Werror=format-security -Wmissing-declarations -Wundef -Winit-self -Wpointer-arith -Wshadow -Wsign-promo -Wno-narrowing -Wno-delete-non-virtual-dtor -fdiagnostics-show-option -pthread -march=i686 -fomit-frame-pointer -msse -msse2 -msse3 -mfpmath=sse -ffunction-sections -O2 -DNDEBUG -DNDEBUG
-- C++ flags (Debug): -O2 -march=i486 -mtune=i686 -fsigned-char -W -Wall -Werror=return-type -Werror=address -Werror=sequence-point -Wformat -Werror=format-security -Wmissing-declarations -Wundef -Winit-self -Wpointer-arith -Wshadow -Wsign-promo -Wno-narrowing -Wno-delete-non-virtual-dtor -fdiagnostics-show-option -pthread -march=i686 -fomit-frame-pointer -msse -msse2 -msse3 -mfpmath=sse -ffunction-sections -g -O0 -DDEBUG -D_DEBUG
-- C Compiler: /usr/bin/cc
-- C flags (Release): -O2 -march=i486 -mtune=i686 -fsigned-char -W -Wall -Werror=return-type -Werror=address -Werror=sequence-point -Wformat -Werror=format-security -Wmissing-declarations -Wmissing-prototypes -Wstrict-prototypes -Wundef -Winit-self -Wpointer-arith -Wshadow -Wno-narrowing -fdiagnostics-show-option -pthread -march=i686 -fomit-frame-pointer -msse -msse2 -msse3 -mfpmath=sse -ffunction-sections -O2 -DNDEBUG -DNDEBUG
-- C flags (Debug): -O2 -march=i486 -mtune=i686 -fsigned-char -W -Wall -Werror=return-type -Werror=address -Werror=sequence-point -Wformat -Werror=format-security -Wmissing-declarations -Wmissing-prototypes -Wstrict-prototypes -Wundef -Winit-self -Wpointer-arith -Wshadow -Wno-narrowing -fdiagnostics-show-option -pthread -march=i686 -fomit-frame-pointer -msse -msse2 -msse3 -mfpmath=sse -ffunction-sections -g -O0 -DDEBUG -D_DEBUG
-- Linker flags (Release):
-- Linker flags (Debug):
-- Precompiled headers: NO
--
-- OpenCV modules:
-- To be built: core flann imgproc highgui features2d calib3d ml video legacy objdetect photo gpu ocl nonfree contrib stitching superres ts videostab
-- Disabled: world
-- Disabled by dependency: -
-- Unavailable: androidcamera dynamicuda java python viz
--
-- GUI:
-- QT 4.x: YES (ver 4.8.5 EDITION = OpenSource)
-- QT OpenGL support: NO
-- OpenGL support: NO
-- VTK support: NO
--
-- Media I/O:
-- ZLib: /usr/lib/libz.so (ver 1.2.8)
-- JPEG: /usr/lib/libjpeg.so (ver 80)
-- PNG: /usr/lib/libpng.so (ver 1.4.12)
-- TIFF: /usr/lib/libtiff.so (ver 42 - 3.9.7)
-- JPEG 2000: build (ver 1.900.1)
-- OpenEXR: build (ver 1.7.1)
--
-- Video I/O:
-- DC1394 1.x: NO
-- DC1394 2.x: YES (ver 2.2.2)
-- FFMPEG: NO
-- codec: NO
-- format: NO
-- util: NO
-- swscale: NO
-- gentoo-style: NO
-- GStreamer:
-- base: YES (ver 0.10.36)
-- video: YES (ver 0.10.36)
-- app: YES (ver 0.10.36)
-- riff: YES (ver 0.10.36)
-- pbutils: YES (ver 0.10.36)
-- OpenNI: NO
-- OpenNI PrimeSensor Modules: NO
-- PvAPI: NO
-- GigEVisionSDK: NO
-- UniCap: NO
-- UniCap ucil: NO
-- V4L/V4L2: Using libv4l1 (ver 0.9.5) / libv4l2 (ver 0.9.5)
-- XIMEA: NO
-- Xine: NO
--
-- Other third-party libraries:
-- Use IPP: NO
-- Use Eigen: NO
-- Use TBB: NO
-- Use OpenMP: NO
-- Use GCD NO
-- Use Concurrency NO
-- Use C=: NO
-- Use Cuda: NO
-- Use OpenCL: YES
--
-- OpenCL:
-- Version: dynamic
-- Include path: /tmp/SBo/opencv-2.4.11/3rdparty/include/opencl/1.2
-- Use AMD FFT: NO
-- Use AMD BLAS: NO
--
-- Python:
-- Interpreter: /usr/bin/python2 (ver 2.7.5)
--
-- Java:
-- ant: NO
-- JNI: /usr/lib/java/include /usr/lib/java/include/linux /usr/lib/java/include
-- Java tests: NO
--
-- Documentation:
-- Build Documentation: NO
-- Sphinx: NO
-- PdfLaTeX compiler: /usr/share/texmf/bin/pdflatex
-- Doxygen: YES (/usr/bin/doxygen)
--
-- Tests and samples:
-- Tests: YES
-- Performance tests: YES
-- C/C++ Examples: NO
--
-- Install path: /usr
--
-- cvconfig.h is in: /tmp/SBo/opencv-2.4.11/build
I looked through the opencv requirement from below link
http://docs.opencv.org/doc/tutorials/introduction/linux_install/linux_install.html#linux-installation
That I need ffmpeg or libav packages, which I cannot find under standard slackware 14.1 packages. But I installed gstreamer completely instead (gstreamer, gst-pluigns-base, and good) and the error I encountered above definitely has something to do with gstreamer.
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I want to use a Gstreamer pipeline directly with OpenCV to manage the image acquisition from a camera. Currently I don't have the camera so I've been experimenting getting the video from URIs and local files. i'm using a Jetson AGX Xavier with L4T (ubuntu 18.04), my OpenCV build includes Gstreamer and both libraries seem to work fine independently.
For using gstreamer backend, opencv VideoCapture expects a valid pipeline string from your source to appsink (BGR format for color). Your pipeline strings are not correct mainly because they start with the binary command (gstlaunch for gst-launch-1.0, playbin) that you would use in a shell for running these.
I want to capture images from my usb camera with this python code: import cv2 cap=cv2.VideoCapture (PIPELINE_STR, cv2.CAP_GSTREAMER) ret, img = cap.read () I tried many pipelines but none of them can successfully open the VideoCapture object.
I got this fixed by installing libgstreamer-plugins-base1.0-dev. Before that CMake detected GStreamer version 0.10.36, after that - 1.4.5.
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