xwwwb
1
Hi everyone,
I created a palette using trackbar,
When I slide, the window closes,
error message:
[1] 87735 segmentation fault python seven_trackbar.py
this is my code:
import cv2
import numpy as np
def callback(x):
print(x)
cv2.namedWindow('trackbar', cv2.WINDOW_NORMAL)
cv2.createTrackbar('R', 'trackbar', 0, 255, callback)
cv2.createTrackbar('G', 'trackbar', 0, 255, callback)
cv2.createTrackbar('B', 'trackbar', 0, 255, callback)
img = np.zeros((480, 460, 3), np.uint8)
while True:
r = cv2.getTrackbarPos('R', 'trackbar')
g = cv2.getTrackbarPos('G', 'trackbar')
b = cv2.getTrackbarPos('B', 'trackbar')
img[:] = [b, g, r]
cv2.imshow('trackbar', img)
key = cv2.waitKey(0)
if key & 0xff == ord('q'):
break
cv2.destroyAllWindows()
Macbook air M1
Python 3.10.4
opencv-python 4.6.0.66
Does anyone know how to solve it 
berak
2
please tell us, which gui toolkit is used here
(print(cv2.getBuildInformation()))
First you obviously need to debug your code and find out the line and expression that segfaults.
It may not even have anything to do with sliding.
xwwwb
4
General configuration for OpenCV 4.6.0 =====================================
Version control: 4.6.0
Platform:
Timestamp: 2022-06-07T10:22:17Z
Host: Darwin 20.2.0 arm64
CMake: 3.22.3
CMake generator: Unix Makefiles
CMake build tool: /usr/bin/make
Configuration: Release
CPU/HW features:
Baseline: NEON FP16
C/C++:
Built as dynamic libs?: NO
C++ standard: 11
C++ Compiler: /Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/c++ (ver 12.0.5.12050022)
C++ flags (Release): -fsigned-char -W -Wall -Wreturn-type -Wnon-virtual-dtor -Waddress -Wsequence-point -Wformat -Wformat-security -Wmissing-declarations -Wmissing-prototypes -Wstrict-prototypes -Wundef -Winit-self -Wpointer-arith -Wshadow -Wsign-promo -Wuninitialized -Wno-delete-non-virtual-dtor -Wno-unnamed-type-template-args -Wno-comment -fdiagnostics-show-option -Qunused-arguments -Wno-semicolon-before-method-body -ffunction-sections -fdata-sections -fvisibility=hidden -fvisibility-inlines-hidden -O3 -DNDEBUG -DNDEBUG
C++ flags (Debug): -fsigned-char -W -Wall -Wreturn-type -Wnon-virtual-dtor -Waddress -Wsequence-point -Wformat -Wformat-security -Wmissing-declarations -Wmissing-prototypes -Wstrict-prototypes -Wundef -Winit-self -Wpointer-arith -Wshadow -Wsign-promo -Wuninitialized -Wno-delete-non-virtual-dtor -Wno-unnamed-type-template-args -Wno-comment -fdiagnostics-show-option -Qunused-arguments -Wno-semicolon-before-method-body -ffunction-sections -fdata-sections -fvisibility=hidden -fvisibility-inlines-hidden -g -O0 -DDEBUG -D_DEBUG
C Compiler: /Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/cc
C flags (Release): -fsigned-char -W -Wall -Wreturn-type -Wnon-virtual-dtor -Waddress -Wsequence-point -Wformat -Wformat-security -Wmissing-declarations -Wmissing-prototypes -Wstrict-prototypes -Wundef -Winit-self -Wpointer-arith -Wshadow -Wsign-promo -Wuninitialized -Wno-delete-non-virtual-dtor -Wno-unnamed-type-template-args -Wno-comment -fdiagnostics-show-option -Qunused-arguments -Wno-semicolon-before-method-body -ffunction-sections -fdata-sections -fvisibility=hidden -fvisibility-inlines-hidden -O3 -DNDEBUG -DNDEBUG
C flags (Debug): -fsigned-char -W -Wall -Wreturn-type -Wnon-virtual-dtor -Waddress -Wsequence-point -Wformat -Wformat-security -Wmissing-declarations -Wmissing-prototypes -Wstrict-prototypes -Wundef -Winit-self -Wpointer-arith -Wshadow -Wsign-promo -Wuninitialized -Wno-delete-non-virtual-dtor -Wno-unnamed-type-template-args -Wno-comment -fdiagnostics-show-option -Qunused-arguments -Wno-semicolon-before-method-body -ffunction-sections -fdata-sections -fvisibility=hidden -fvisibility-inlines-hidden -g -O0 -DDEBUG -D_DEBUG
Linker flags (Release): -Wl,-dead_strip
Linker flags (Debug): -Wl,-dead_strip
ccache: YES
Precompiled headers: NO
Extra dependencies: -framework OpenCL /Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX11.3.sdk/System/Library/Frameworks/Accelerate.framework -lm -ldl -framework Cocoa -framework AppKit
3rdparty dependencies: libprotobuf ade ittnotify libjpeg-turbo libwebp libpng libtiff libopenjp2 IlmImf zlib quirc tegra_hal
OpenCV modules:
To be built: calib3d core dnn features2d flann gapi highgui imgcodecs imgproc ml objdetect photo python3 stitching video videoio
Disabled: world
Disabled by dependency: -
Unavailable: java python2 ts
Applications: -
Documentation: NO
Non-free algorithms: NO
GUI: COCOA
Cocoa: YES
VTK support: NO
Media I/O:
ZLib: build (ver 1.2.12)
JPEG: build-libjpeg-turbo (ver 2.1.2-62)
WEBP: build (ver encoder: 0x020f)
PNG: build (ver 1.6.37)
TIFF: build (ver 42 - 4.2.0)
JPEG 2000: build (ver 2.4.0)
OpenEXR: build (ver 2.3.0)
HDR: YES
SUNRASTER: YES
PXM: YES
PFM: YES
Video I/O:
DC1394: NO
FFMPEG: YES
avcodec: YES (58.134.100)
avformat: YES (58.76.100)
avutil: YES (56.70.100)
swscale: YES (5.9.100)
avresample: YES (4.0.0)
GStreamer: NO
AVFoundation: YES
Parallel framework: GCD
Trace: YES (with Intel ITT)
Other third-party libraries:
Lapack: YES (/Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX11.3.sdk/System/Library/Frameworks/Accelerate.framework -lm -ldl)
Eigen: NO
Custom HAL: YES (carotene (ver 0.0.1))
Protobuf: build (3.19.1)
OpenCL: YES (no extra features)
Include path: NO
Link libraries: -framework OpenCL
Python 3:
Interpreter: /Users/xperience/.pyenv/versions/3.7.10/bin/python3.7 (ver 3.7.10)
Libraries: /Users/xperience/.pyenv/versions/3.7.10/lib/libpython3.7m.a (ver 3.7.10)
numpy: /Users/xperience/.pyenv/versions/3.7.10/lib/python3.7/site-packages/numpy/core/include (ver 1.21.0)
install path: python/cv2/python-3
Python (for build): /System/Library/Frameworks/Python.framework/Versions/2.7/bin/python2.7
Java:
ant: NO
JNI: NO
Java wrappers: NO
Java tests: NO
Install to: /Users/xperience/actions-runner/_work/opencv-python/opencv-python/_skbuild/macosx-11.0-arm64-3.7/cmake-install
I use pip to install
xwwwb
5
I use single step debugging
When the code runs to
key=cv2. waitKey (0)
it will crash
yeah, highgui trackbars are buggy on apple
berak
7
let the devs know, and raise an issue
better yet, check for existing issues.
kosFoo
9
This macOs ARM related issue has been solved with the rolling built packages:
Use pip install opencv-contrib-python-rolling for example. (v 5.0.0.20221015 at the time of writing).
Issue: OpenCV Trackbar Crash on ARM Mac · Issue #22561 · opencv/opencv · GitHub
1 Like