Darknet: Darknet Start Problem

[tuncaybahadir]

Hello there,

I am a Ubuntu 16.04 user. I started the system first with OpenCV (2.4.0) and then started the yolo setup with OpenCV support. When I finish the process, I get an error about the following library when I write ./darknet. How can I solve my problem?

./darknet ./darknet: error while loading shared libraries: libopencv_highgui.so.3.4: cannot open shared object file: No such file or directory

./darknet detect cfg/yolo.cfg yolo.weights data/dog.jpg ./darknet: error while loading shared libraries: libopencv_highgui.so.3.4: cannot open shared object file: No such file or directory

[guerillagorilla]

Had the same issue as you on 17.10. After running both below, I was able to run darknet:

• sudo /bin/bash -c 'echo "/usr/local/lib" > /etc/ld.so.conf.d/opencv.conf'
• sudo ldconfig

[tuncaybahadir]

Thank you,
The sudo ldconfig command solved my problem.

[rachana88]

having this error , please help

./darknet: error while loading shared libraries: libopencv_highgui.so.3.1: cannot open shared object file: No such file or directory

[kasparov92]

@rachana88 you shall do the same as @guerillagorilla 's solution but replace the /usr/local/lib with the actual location of where you have installed the opencv

[mouradbelo]

I have the same problem. I have 4.0 version in /usr/local/lib : libopencv_highgui.so.4.0 but the error is about libopencv_highgui.so.3.3. So even after trying your solution it doesn't work because there isn't the libopencv_highgui.so.3.3 there's only libopencv_highgui.so.4.0.

[ianfhunter]

I too had this issue but was able to re-install withapt-get install libopencv-highgui-dev

[LinderPi]

I have the same problem. I have 4.0 version in /usr/local/lib : libopencv_highgui.so.4.0 but the error is about libopencv_highgui.so.3.3. So even after trying your solution it doesn't work because there isn't the libopencv_highgui.so.3.3 there's only libopencv_highgui.so.4.0.

@mouradbelo
How did you fix the problem in the end? I have the same issue and I don't know how to install the older version of that library. Please help!

[mouradbelo]

@LinderPi

I think you need to update your pkgconfig path file and compile again darknet. I don't have my computer in front of me now, i'll tell you how tomorrow. However if you want to install the old OpenCV library here's the link: https://opencv.org/releases.html.
Download the source code of the 3.3 version, compile then install. Here's a link on how to do this : https://docs.opencv.org/3.4/d7/d9f/tutorial_linux_install.html.
You can use ccmake instead of cmake to list all the options and choose what you want.

Hope this helps !

[barresoft]

for noobs (me) solution:

Install libs:
sudo apt-get install libopencv-highgui-dev

search for installed file
find /usr | grep libopencv_highgui.so.3.4

[milliema]

For miniconda/annaconda users, the libopencv_highgui.so.3.2 is located in : miniconda/envs/env_namexxx/lib

[DavidChenTaipei]

I am a MacOS 10.14 user and opencv-contrib-python version is 4.1.2.30 , I tried to import Darknet on python in terminal the error message was
OSError: libopencv_highgui.so.3.2: cannot open shared object file: No such file or directory
And @guerillagorilla 's solution doent work for me and I have already changed the path into where my libopencv_highgui.so.3.2 is installed
Can anyone help
I tried to find where libopencv_highgui.so.3.2 is installed so I tried
find /usr | grep libopencv_highgui.so.3.2
Then here's the output
/usr/lib/x86_64-linux-gnu/libopencv_highgui.so.3.2
So then I tried
sudo /bin/bash -c 'echo "/usr/lib/x86_64-linux-gnu/" > /etc/ld.so.conf.d/opencv.conf'
(Also I have also tried
sudo /bin/bash -c 'echo "/usr/lib/" > /etc/ld.so.conf.d/opencv.conf')
And
sudo ldconfig
then I got the same error message again

[pullmyleg]

Thanks to your post fixed a similar issue!

My fix was slightly different and am noting here so I don't forget :). Due to using an Azure Deep Learning Virtual Machine on Ubuntu 18.04 the OpenCV library files we're in the anaconda environment directories.

My error: error while loading shared libraries: libopencv_dnn.so.3.4: cannot open shared object file: No such file or directory

Used similar steps to you:

1. Searched for file missing sudo find / -name "libopencv_dnn.so.3.4*"
2. The file was found multiple times. I selected the conda environment I was using. In my case py37_default. I know this environment has all the libraries I required
3. Created opencv.conf in /etc/ld.so.conf.d
4. Added the anaconda/enviro/python/lib directory chosen to the opencv.conf file as one line and saved using sudo nano /etc/ld.so.conf.d/opencv.conf
5. Run this command: sudo ldconfig -v
6. Everything works as normal.

Note to be safe I also deleted the darknet repo folder and rebuilt using CMake as per readme.

[huynhldvn]

Had the same issue as you on 17.10. After running both below, I was able to run darknet:

• sudo /bin/bash -c 'echo "/usr/local/lib" > /etc/ld.so.conf.d/opencv.conf'
• sudo ldconfig

thank you @guerillagorilla you saved my day ~,~

[fengzihaoran]

What about this situation？
./darknet: error while loading shared libraries: libmvec.so.1: cannot open shared object file: No such file or directory

[husseinpasha]

I hade OpenCV 4.0 and then I removed it and installed OpenCV 3.4 from the source. After that, I got the same issue. I followed the above instructions but none of them worked except reinstalling darknet. After reinstalling darknet the problem was solved.
Ubuntu 18.04
Jetson TX2

[lswgh]

using make clean and then make ,it has solved!