ubuntu22, net6.0 use OpenCvSharp4 throw exception: Unable to load shared library 'OpenCvSharpExtern' or one of its dependencies.

[cwf689]

Environment：

system: ubuntu22 ， arm64 libs: OpenCvSharp4 ver 4.8.0.20230708 OpenCvSharp4.Extensions ver 4.8.0.20230708 OpenCvSharp4.runtime.linux-arm ver 4.8.0.20230708 OpenCvSharp4.runtime.linux-arm64.cuda ver 4.8.0.20230708

Example code:

using OpenCvSharp; ... var capture = new VideoCapture(0);

Output:

The type initializer for 'OpenCvSharp.Internal.NativeMethods' threw an exception. Unable to load shared library 'OpenCvSharpExtern' or one of its dependencies. In order to help diagnose loading problems, consider setting the LD_DEBUG environment variable: libOpenCvSharpExtern: cannot open shared object file: No such file or directory

What did you intend to be?

[MoHamzawy]

I am getting the same with ubuntu 22 and net 7.0. I think currently there is no support for ubuntu 22?

[BradMJustice]

I'm also experiencing this. Specifically, I'm trying to run this in a Docker container. I've tried in a .NET 6 container (which uses 20) and a .NET 7 container (which uses 22). I do have the base OpenCvSharp4 and OpenCvSharp4.runtime.ubuntu.20.04-x64 packages referenced in my project.

[BradMJustice]

I'm also experiencing this. Specifically, I'm trying to run this in a Docker container. I've tried in a .NET 6 container (which uses 20) and a .NET 7 container (which uses 22). I do have the base OpenCvSharp4 and OpenCvSharp4.runtime.ubuntu.20.04-x64 packages referenced in my project.

Never mind, I was able to get past this by using the docker images located here https://github.com/shimat?tab=packages as my base image.

[sdcb]

Hey @cwf689, You can try my self compiled ubuntu22.04 mini version as following, I only compiled core, imgproc, imgcodec:

Id	Version	Size	OS	Arch
Sdcb.OpenCvSharp4.mini.runtime.centos.7-arm64		3.23MB	CentOS 7	ARM64
Sdcb.OpenCvSharp4.mini.runtime.centos.7-x64		16.75MB	CentOS 7	x64
Sdcb.OpenCvSharp4.mini.runtime.debian.11-arm64		4.05MB	Debian 11	ARM64
Sdcb.OpenCvSharp4.mini.runtime.debian.11-x64		18.13MB	Debian 11	x64
Sdcb.OpenCvSharp4.mini.runtime.debian.12-arm64		4.18MB	Debian 12	ARM64
Sdcb.OpenCvSharp4.mini.runtime.debian.12-x64		17.47MB	Debian 12	x64
Sdcb.OpenCvSharp4.mini.runtime.ubuntu.22.04-arm64		4.18MB	Ubuntu 22.04	ARM64
Sdcb.OpenCvSharp4.mini.runtime.ubuntu.22.04-x64		17.47MB	Ubuntu 22.04	x64
Sdcb.OpenCvSharp4.mini.runtime.android-arm64		4.04MB	Android	ARM64

[maaft]

@sdcb Hey, thank you! Do you have a link to the sources of your "mini" version?

[sdcb]

@maaft you're right, I created a build instructions (not source code, but like docs) here: https://github.com/sdcb/opencvsharp-mini-runtime/tree/main

[yangbocheng]

there is a method, my env is ubuntu20.04 x64

1. copy OpenCvSharpExtern.so to your publish dir
2. ldd libOpenCvSharpExtern.so | grep found to see whether your system has missed some so/dll for me is:

 root@ubuntu2004:/home/temp/test8/testubuntucv# ldd *.so* | grep found
	liblttng-ust.so.0 => not found
	libtesseract.so.4 => not found
	libgtk-x11-2.0.so.0 => not found
	libgdk-x11-2.0.so.0 => not found
	libdc1394.so.22 => not found
	libavcodec.so.58 => not found
	libavformat.so.58 => not found
	libavutil.so.56 => not found
	libswscale.so.5 => not found
	libIlmImf-2_3.so.24 => not found

3. to fix this excecute cmd: apt-get install libgtk2.0 lttng-ust libtesseract4 libavcodec58 libavformat58 libavutil56 libswscale5 libdc1394-22-dev libopenexr24

then this nuget dll work well. may be you should change the cmd by your real situation

[yangbocheng]

just use what @sdcb says, it works very well in ubuntu-2204 pure system. thanks @sdcb

[mohdshabbeer]

there is a method, my env is ubuntu20.04 x64

1. copy OpenCvSharpExtern.so to your publish dir
2. ldd libOpenCvSharpExtern.so | grep found to see whether your system has missed some so/dll for me is:

 root@ubuntu2004:/home/temp/test8/testubuntucv# ldd *.so* | grep found
	liblttng-ust.so.0 => not found
	libtesseract.so.4 => not found
	libgtk-x11-2.0.so.0 => not found
	libgdk-x11-2.0.so.0 => not found
	libdc1394.so.22 => not found
	libavcodec.so.58 => not found
	libavformat.so.58 => not found
	libavutil.so.56 => not found
	libswscale.so.5 => not found
	libIlmImf-2_3.so.24 => not found

3. to fix this excecute cmd: apt-get install libgtk2.0 lttng-ust libtesseract4 libavcodec58 libavformat58 libavutil56 libswscale5 libdc1394-22-dev libopenexr24

then this nuget dll work well. may be you should change the cmd by your real situation @yangbocheng sorry i am getting errors E: Unable to locate package lttng-ust E: Unable to locate package libdc1394-22-dev E: Unable to locate package libopenexr24

[peter-nguyen-contemi]

Hi @sdcb, are there any pre-built packages of OpenCvSharp4 version 4.10.0.20240616 for Ubuntu 22.04 (mini or full version) available for use?