cv::VideoCapture cap(0);
(!cap.isOpened())
return -1;
This always returns -1. I've included the results of cv::getBuildInformation(). Please help!
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ General configuration for OpenCV 3.0.0 ===================================== Version control: unknown
Platform: Host: Linux 3.10.0-693.2.2.el7.x86_64 x86_64 CMake: 3.6.3 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 4.8.5) C++ flags (Release): -fsigned-char -W -Wall -Werror=return-type -Werror=non-virtual-dtor -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 -Wno-long-long -pthread -fomit-frame-pointer -msse -msse2 -mno-avx -msse3 -mno-ssse3 -mno-sse4.1 -mno-sse4.2 -ffunction-sections -fvisibility=hidden -fvisibility-inlines-hidden -O2 -DNDEBUG -DNDEBUG C++ flags (Debug): -fsigned-char -W -Wall -Werror=return-type -Werror=non-virtual-dtor -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 -Wno-long-long -pthread -fomit-frame-pointer -msse -msse2 -mno-avx -msse3 -mno-ssse3 -mno-sse4.1 -mno-sse4.2 -ffunction-sections -fvisibility=hidden -fvisibility-inlines-hidden -g -O0 -DDEBUG -D_DEBUG C Compiler: /usr/bin/cc C flags (Release): -fsigned-char -W -Wall -Werror=return-type -Werror=non-virtual-dtor -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 -Wno-long-long -pthread -fomit-frame-pointer -msse -msse2 -mno-avx -msse3 -mno-ssse3 -mno-sse4.1 -mno-sse4.2 -ffunction-sections -fvisibility=hidden -O2 -DNDEBUG -DNDEBUG C flags (Debug): -fsigned-char -W -Wall -Werror=return-type -Werror=non-virtual-dtor -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 -Wno-long-long -pthread -fomit-frame-pointer -msse -msse2 -mno-avx -msse3 -mno-ssse3 -mno-sse4.1 -mno-sse4.2 -ffunction-sections -fvisibility=hidden -g -O0 -DDEBUG -D_DEBUG Linker flags (Release): Linker flags (Debug): Precompiled headers: YES Extra dependencies: Qt5::Core Qt5::Gui Qt5::Widgets Qt5::Test Qt5::Concurrent /lib64/libjpeg.so /lib64/libpng.so /lib64/libz.so /lib64/libtiff.so avcodec avformat avutil swscale avresample dl m pthread rt 3rdparty dependencies: libwebp libjasper IlmImf ippicv
OpenCV modules: To be built: hal core flann imgproc ml photo video imgcodecs shape videoio highgui objdetect superres ts features2d calib3d stitching videostab Disabled: world Disabled by dependency: - Unavailable: cudaarithm cudabgsegm cudacodec cudafeatures2d cudafilters cudaimgproc cudalegacy cudaobjdetect cudaoptflow cudastereo cudawarping cudev java python2 python3 viz
GUI: QT 5.x: YES (ver 5.8.0) QT OpenGL support: NO OpenGL support: NO VTK support: NO
Media I/O: ZLib: /lib64/libz.so (ver 1.2.7) JPEG: /lib64/libjpeg.so (ver ) WEBP: build (ver 0.3.1) PNG: /lib64/libpng.so (ver 1.5.13) TIFF: /lib64/libtiff.so (ver 42 - 4.0.3) JPEG 2000: build (ver 1.900.1) OpenEXR: build (ver 1.7.1) GDAL: NO
Video I/O: DC1394 1.x: NO DC1394 2.x: NO FFMPEG: YES codec: YES (ver 56.60.100) format: YES (ver 56.40.101) util: YES (ver 54.31.100) swscale: YES (ver 3.1.101) resample: YES (ver 2.1.0) gentoo-style: YES GStreamer: NO OpenNI: NO OpenNI PrimeSensor Modules: NO OpenNI2: NO PvAPI: NO GigEVisionSDK: NO UniCap: NO UniCap ucil: NO V4L/V4L2: NO/YES XIMEA: NO Xine: NO gPhoto2: NO
Other third-party libraries: Use IPP: 8.2.1 [8.2.1] at: /home/USER/OpenCVlibs/opencv-3.0.0/3rdparty/ippicv/unpack/ippicv_lnx Use IPP Async: NO Use Eigen: NO Use TBB: NO Use OpenMP: NO Use GCD NO Use Concurrency NO Use C=: NO Use pthreads for parallel for: YES Use Cuda: NO Use OpenCL: YES
OpenCL: Version: dynamic Include path: /home/USER/OpenCVlibs/opencv-3.0.0/3rdparty/include/opencl/1.2 Use AMDFFT: NO Use AMDBLAS: NO
Python 2: Interpreter: /usr/bin/python2.7 (ver 2.7.5)
Python 3: Interpreter: NO
Python (for build): /usr/bin/python2.7
Java: ant: NO JNI: NO Java wrappers: NO Java tests: NO
Matlab: mex: NO
Documentation: Doxygen: /usr/bin/doxygen (ver 1.8.5) PlantUML: NO
Tests and samples: Tests: YES Performance tests: YES C/C++ Examples: NO
Install path: /home/USER/OpenCVlibs/opencv-3.0.0/release
