hmaarrfk
commented
2 years ago @Tobias-Fischer
Closed johnholman closed 2 years ago
hmaarrfk
commented
2 years ago @Tobias-Fischer
hmaarrfk
commented
2 years ago I'm not even sure that cv.samples.findFile("jurassic_park.png") works. It doesn't on linux. We don't ship the examples.
johnholman
commented
2 years ago It does if you put the image file in the same directory as the script though. For example it works on windows and on the pi (linux-aarch64) if you install opencv-python with pip rather than the conda-forge package.
johnholman
commented
2 years ago But apologise for the unnecessary findFile() etc! Simplified version below produces the same error:
import cv2 as cv img = cv.imread("jurassic_park.png") print(f'image size {img.shape}') cv.imshow("Display window", img) k = cv.waitKey(0)
hmaarrfk
commented
2 years ago I'm sorry to ask. Can you provide the correctly named image. This is just to make it easier for others to help you
hmaarrfk
commented
2 years ago Do you have the equivalent of these packages installed
https://github.com/conda-forge/opencv-feedstock/blob/main/recipe/yum_requirements.txt
johnholman
commented
2 years ago On the image - don't know what copyright situation is for the jurassic one but any image will do - I'll look for something and attach in a moment.
On the mesa-libGL requirement - if that is a conda package I don't think I have it installed. I just tried running "mamba install mesa-libgl" and it said nothing provides it. Can you advise on the right incantation - I can see lots of different related packages with "mamba search mesa-libgl"
johnholman
commented
2 years ago Revised example with image attached:
import cv2 as cv
img = cv.imread("bosch_shredder.jpg")
print(f'image size {img.shape}')
cv.imshow("Display window", img)
k = cv.waitKey(0)
hmaarrfk
commented
2 years ago It should be a package you install with apt or yum.
It provides OpenGL by the operating system
johnholman
commented
2 years ago apt list mesa --installed shows
libegl-mesa0/stable,now 20.3.5-1+rpt3+rpi1 arm64 [installed,automatic] libgl1-mesa-dri/stable,now 20.3.5-1+rpt3+rpi1 arm64 [installed] libglapi-mesa/stable,now 20.3.5-1+rpt3+rpi1 arm64 [installed,automatic] libgles2-mesa/stable,now 20.3.5-1+rpt3+rpi1 arm64 [installed] libglx-mesa0/stable,now 20.3.5-1+rpt3+rpi1 arm64 [installed,automatic] mesa-va-drivers/stable,now 20.3.5-1+rpt3+rpi1 arm64 [installed,automatic] mesa-vdpau-drivers/stable,now 20.3.5-1+rpt3+rpi1 arm64 [installed,automatic]
Does that look sufficient? (Maybe this is is a raspberry pi specific thing?)
johnholman
commented
2 years ago I think qt5 is working on this platform. After also installing pyqt a simple qt application works:
from PyQt5.QtWidgets import QApplication, QWidget import sys app = QApplication(sys.argv) window = QWidget() window.show() app.exec()
I can also use imshow() from matplotlib using the qt backend:
import cv2 as cv import matplotlib.pyplot as plt import matplotlib as mpl
img = cv.imread("bosch_shredder.jpg") img = cv.cvtColor(img, cv.COLOR_BGR2RGB) mpl.use('QtAgg') plt.imshow(img) plt.show()
but calling imshow() from opencv still fails.
NOTE (added to first comment as well)
Even simpler test which doesn't require a test image:
import cv2 cv2.waitKey(0)
which produces similar error:
cv2.error: OpenCV(4.5.5) /home/conda/feedstock_root/build_artifacts/libopencv_1647515468288/work/modules/highgui/src/window.cpp:1334: error: (-2:Unspecified error) The function is not implemented. Rebuild the library with Windows, GTK+ 2.x or Cocoa support. If you are on Ubuntu or Debian, install libgtk2.0-dev and pkg-config, then re-run cmake or configure script in function 'cvWaitKey'
hajapy
commented
2 years ago Looks like WITH_QT is being set to 0 on these builds: https://dev.azure.com/conda-forge/feedstock-builds/_build/results?buildId=476367&view=logs&j=696704cc-6fef-57a3-ea36-f27779b8cd5e&t=ed2e6513-0a06-519f-13f9-1e5619642f2a&l=2318
Could be due to target_platform "linux-aarch64" failing this check https://github.com/conda-forge/opencv-feedstock/blob/main/recipe/build.sh#L26 and getting disabled.
hmaarrfk
commented
2 years ago Try installing in an hour or two.
johnholman
commented
2 years ago Many thanks - this works now
hmaarrfk
commented
2 years ago Thank you for helping debug so much!
Tobias-Fischer
commented
2 years ago Thanks both - my bad for missing to change the build.sh as well!
Solution to issue cannot be found in the documentation.
Issue
Trying to use opencv on 8GB raspberry pi 4 running PIOS 64 bit (Debian bullseye). Installed using mamba-forge as
Running simple test script that reads an image file and then attempts to display it with imshow():
Result:
I hoped this would work as https://github.com/conda-forge/opencv-feedstock/pull/301 suggests that qt support has been merged but perhaps I misunderstand. I did notice that qt was not installed as a dependency hence the explicit installation.
NOTE (added next day) Still simpler test which doesn't require a test image is
import cv2 cv2.waitKey(0)
which produces similar error:
cv2.error: OpenCV(4.5.5) /home/conda/feedstock_root/build_artifacts/libopencv_1647515468288/work/modules/highgui/src/window.cpp:1334: error: (-2:Unspecified error) The function is not implemented. Rebuild the library with Windows, GTK+ 2.x or Cocoa support. If you are on Ubuntu or Debian, install libgtk2.0-dev and pkg-config, then re-run cmake or configure script in function 'cvWaitKey'
Installed packages
Environment info