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Hello, having installed python-opencv + opencv-cuda, I'm trying to use FarnebackOpticalFlow on CUDA, but I get a "no attribute" error:
$ pacman -Q | grep opencv
opencv-cuda 4.9.0-8
python-opencv 4.9.0-8
$ python
Python 3.12.3 (main, Apr 23 2024, 09:16:07) [GCC 13.2.1 20240417] on linux
Type "help", "copyright", "credits" or "license" for more information.
>>> import cv2
>>> cv2.cuda_FarnebackOpticalFlow
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
AttributeError: module 'cv2' has no attribute 'cuda_FarnebackOpticalFlow'while CUDA seems to be working with the python binding:
$ python
Python 3.12.3 (main, Apr 23 2024, 09:16:07) [GCC 13.2.1 20240417] on linux
Type "help", "copyright", "credits" or "license" for more information.
>>> import cv2
>>> cv2.cuda.getCudaEnabledDeviceCount()
2and also looks like opencv-cuda was built with cudaoptflow enabled:
$ python
Python 3.12.3 (main, Apr 23 2024, 09:16:07) [GCC 13.2.1 20240417] on linux
Type "help", "copyright", "credits" or "license" for more information.
>>> import cv2
>>> print(cv2.getBuildInformation())
General configuration for OpenCV 4.9.0 =====================================
Version control: 4.9.0-dirty
Extra modules:
Location (extra): /build/opencv/src/opencv_contrib/modules
Version control (extra): 4.9.0-dirty
Platform:
Timestamp: 2024-05-23T21:17:36Z
Host: Linux 6.9.1-arch1-1 x86_64
CMake: 3.29.3
CMake generator: Unix Makefiles
CMake build tool: /usr/bin/make
Configuration: Release
CPU/HW features:
Baseline: SSE SSE2
requested: SSE3
required: SSE2
disabled: SSE3
Dispatched code generation: SSE4_1 SSE4_2 FP16 AVX AVX2 AVX512_SKX
requested: SSE4_1 SSE4_2 AVX FP16 AVX2 AVX512_SKX
SSE4_1 (16 files): + SSE3 SSSE3 SSE4_1
SSE4_2 (1 files): + SSE3 SSSE3 SSE4_1 POPCNT SSE4_2
FP16 (0 files): + SSE3 SSSE3 SSE4_1 POPCNT SSE4_2 FP16 AVX
AVX (8 files): + SSE3 SSSE3 SSE4_1 POPCNT SSE4_2 AVX
AVX2 (36 files): + SSE3 SSSE3 SSE4_1 POPCNT SSE4_2 FP16 FMA3 AVX AVX2
AVX512_SKX (5 files): + SSE3 SSSE3 SSE4_1 POPCNT SSE4_2 FP16 FMA3 AVX AVX2 AVX_512F AVX512_COMMON AVX512_SKX
C/C++:
Built as dynamic libs?: YES
C++ standard: 17
C++ Compiler: /usr/bin/g++-13 (ver 13.3.0)
C++ flags (Release): -march=x86-64 -mtune=generic -O2 -pipe -fno-plt -fexceptions -Wp,-D_FORTIFY_SOURCE=3 -Wformat -Werror=format-security -fstack-clash-protection -fcf-protection -fno-omit-frame-pointer -mno-omit-leaf-frame-pointer -Wp,-D_GLIBCXX_ASSERTIONS -g -ffile-prefix-map=/build/opencv/src=/usr/src/debug/opencv -flto=auto -fno-lto -fsigned-char -W -Wall -Wreturn-type -Wnon-virtual-dtor -Waddress -Wsequence-point -Wformat -Wformat-security -Wmissing-declarations -Wundef -Winit-self -Wpointer-arith -Wshadow -Wsign-promo -Wuninitialized -Wsuggest-override -Wno-delete-non-virtual-dtor -Wno-comment -Wimplicit-fallthrough=3 -Wno-strict-overflow -fdiagnostics-show-option -Wno-long-long -pthread -fomit-frame-pointer -ffunction-sections -fdata-sections -msse -msse2 -fvisibility=hidden -fvisibility-inlines-hidden -O3 -DNDEBUG -DNDEBUG
C++ flags (Debug): -march=x86-64 -mtune=generic -O2 -pipe -fno-plt -fexceptions -Wp,-D_FORTIFY_SOURCE=3 -Wformat -Werror=format-security -fstack-clash-protection -fcf-protection -fno-omit-frame-pointer -mno-omit-leaf-frame-pointer -Wp,-D_GLIBCXX_ASSERTIONS -g -ffile-prefix-map=/build/opencv/src=/usr/src/debug/opencv -flto=auto -fno-lto -fsigned-char -W -Wall -Wreturn-type -Wnon-virtual-dtor -Waddress -Wsequence-point -Wformat -Wformat-security -Wmissing-declarations -Wundef -Winit-self -Wpointer-arith -Wshadow -Wsign-promo -Wuninitialized -Wsuggest-override -Wno-delete-non-virtual-dtor -Wno-comment -Wimplicit-fallthrough=3 -Wno-strict-overflow -fdiagnostics-show-option -Wno-long-long -pthread -fomit-frame-pointer -ffunction-sections -fdata-sections -msse -msse2 -fvisibility=hidden -fvisibility-inlines-hidden -g -DDEBUG -D_DEBUG
C Compiler: /usr/bin/gcc-13
C flags (Release): -march=x86-64 -mtune=generic -O2 -pipe -fno-plt -fexceptions -Wp,-D_FORTIFY_SOURCE=3 -Wformat -Werror=format-security -fstack-clash-protection -fcf-protection -fno-omit-frame-pointer -mno-omit-leaf-frame-pointer -g -ffile-prefix-map=/build/opencv/src=/usr/src/debug/opencv -flto=auto -fno-lto -fsigned-char -W -Wall -Wreturn-type -Waddress -Wsequence-point -Wformat -Wformat-security -Wmissing-declarations -Wmissing-prototypes -Wstrict-prototypes -Wundef -Winit-self -Wpointer-arith -Wshadow -Wuninitialized -Wno-comment -Wimplicit-fallthrough=3 -Wno-strict-overflow -fdiagnostics-show-option -Wno-long-long -pthread -fomit-frame-pointer -ffunction-sections -fdata-sections -msse -msse2 -fvisibility=hidden -O3 -DNDEBUG -DNDEBUG
C flags (Debug): -march=x86-64 -mtune=generic -O2 -pipe -fno-plt -fexceptions -Wp,-D_FORTIFY_SOURCE=3 -Wformat -Werror=format-security -fstack-clash-protection -fcf-protection -fno-omit-frame-pointer -mno-omit-leaf-frame-pointer -g -ffile-prefix-map=/build/opencv/src=/usr/src/debug/opencv -flto=auto -fno-lto -fsigned-char -W -Wall -Wreturn-type -Waddress -Wsequence-point -Wformat -Wformat-security -Wmissing-declarations -Wmissing-prototypes -Wstrict-prototypes -Wundef -Winit-self -Wpointer-arith -Wshadow -Wuninitialized -Wno-comment -Wimplicit-fallthrough=3 -Wno-strict-overflow -fdiagnostics-show-option -Wno-long-long -pthread -fomit-frame-pointer -ffunction-sections -fdata-sections -msse -msse2 -fvisibility=hidden -g -DDEBUG -D_DEBUG
Linker flags (Release): -Wl,--exclude-libs,libippicv.a -Wl,--exclude-libs,libippiw.a -Wl,-O1 -Wl,--sort-common -Wl,--as-needed -Wl,-z,relro -Wl,-z,now -Wl,-z,pack-relative-relocs -flto=auto -fno-lto -Wl,--gc-sections -Wl,--as-needed -Wl,--no-undefined
Linker flags (Debug): -Wl,--exclude-libs,libippicv.a -Wl,--exclude-libs,libippiw.a -Wl,-O1 -Wl,--sort-common -Wl,--as-needed -Wl,-z,relro -Wl,-z,now -Wl,-z,pack-relative-relocs -flto=auto -fno-lto -Wl,--gc-sections -Wl,--as-needed -Wl,--no-undefined
ccache: NO
Precompiled headers: NO
Extra dependencies: m pthread cudart_static dl rt nppc nppial nppicc nppidei nppif nppig nppim nppist nppisu nppitc npps cublas cudnn cufft -L/opt/cuda/lib64 -L/lib64
3rdparty dependencies:
OpenCV modules:
To be built: alphamat aruco bgsegm bioinspired calib3d ccalib core cudaarithm cudabgsegm cudacodec cudafeatures2d cudafilters cudaimgproc cudalegacy cudaobjdetect cudaoptflow cudastereo cudawarping cudev cvv datasets dnn dnn_objdetect dnn_superres dpm face features2d flann freetype fuzzy gapi hdf hfs highgui img_hash imgcodecs imgproc intensity_transform java line_descriptor mcc ml objdetect optflow phase_unwrapping photo plot python3 quality rapid reg rgbd saliency shape stereo stitching structured_light superres surface_matching text tracking video videoio videostab viz wechat_qrcode xfeatures2d ximgproc xobjdetect xphoto
Disabled: world
Disabled by dependency: -
Unavailable: cannops julia matlab ovis python2 sfm ts
Applications: examples apps
Documentation: NO
Non-free algorithms: YES
GUI: QT6
QT: YES (ver 6.7.1 )
QT OpenGL support: YES (Qt6::OpenGL )
GTK+: NO
OpenGL support: YES (/lib64/libGL.so /lib64/libGLU.so)
VTK support: YES (ver 9.3.0)
Media I/O:
ZLib: /lib64/libz.so (ver 1.3.1)
JPEG: /lib64/libjpeg.so (ver 80)
WEBP: /lib64/libwebp.so (ver encoder: 0x020f)
PNG: /lib64/libpng.so (ver 1.6.43)
TIFF: /lib64/libtiff.so (ver 42 / 4.6.0)
JPEG 2000: OpenJPEG (ver 2.5.2)
OpenEXR: OpenEXR::OpenEXR (ver 3.2.4)
HDR: YES
SUNRASTER: YES
PXM: YES
PFM: YES
Video I/O:
DC1394: YES (2.2.7)
FFMPEG: YES
avcodec: YES (60.31.102)
avformat: YES (60.16.100)
avutil: YES (58.29.100)
swscale: YES (7.5.100)
avresample: NO
GStreamer: YES (1.24.3)
v4l/v4l2: YES (linux/videodev2.h)
Parallel framework: TBB (ver 2021.12 interface 12120)
Trace: YES (with Intel ITT)
Other third-party libraries:
Intel IPP: 2021.10.0 [2021.10.0]
at: /build/opencv/src/build-cuda/3rdparty/ippicv/ippicv_lnx/icv
Intel IPP IW: sources (2021.10.0)
at: /build/opencv/src/build-cuda/3rdparty/ippicv/ippicv_lnx/iw
VA: YES
Lapack: YES (/usr/lib/liblapack.so /usr/lib/libblas.so /usr/lib/libcblas.so)
Eigen: YES (ver 3.4.0)
Custom HAL: NO
Protobuf: /usr/lib/libprotobuf.so.25.3.0 (25.3.0)
Flatbuffers: builtin/3rdparty (23.5.9)
NVIDIA CUDA: YES (ver 12.5, CUFFT CUBLAS)
NVIDIA GPU arch: 52 53 60 61 62 70 72 75 80 86 87 89 90 90
NVIDIA PTX archs: 90
cuDNN: YES (ver 9.1.1)
Vulkan: YES
Include path: /build/opencv/src/opencv/3rdparty/include
Link libraries: Dynamic load
OpenCL: YES (INTELVA)
Include path: /build/opencv/src/opencv/3rdparty/include/opencl/1.2
Link libraries: Dynamic load
Python 3:
Interpreter: /usr/bin/python3 (ver 3.12.3)
Libraries: /lib64/libpython3.12.so (ver 3.12.3)
numpy: /usr/lib/python3.12/site-packages/numpy/core/include (ver 1.26.4)
install path: lib/python3.12/site-packages
Python (for build): /usr/bin/python3
Java:
ant: /bin/ant (ver 1.10.14)
Java: NO
JNI: /usr/lib/jvm/default/include /usr/lib/jvm/default/include/linux /usr/lib/jvm/default/include
Java wrappers: YES (ANT)
Java tests: NO
Install to: /usr
-----------------------------------------------------------------But yet cuda_FarnebackOpticalFlow isn't accessible. While I know how to build python-opencv wheel with CUDA support (including FarnebackOpticalFlow) -- that's what I'm using right now -- it would've been more convenient to us pre-built binaries from Arch.
Thanks in advance!
Last edited by alllexx88 (2024-12-01 12:06:53)
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The issue should be addressed a few days ago in https://gitlab.archlinux.org/archlinux/ … 6d994aa323
Now you can install `python-opencv-cuda` package (replacing `python-opencv`) and check the attribute again.
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Awesome, it works, thanks metamer!
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