[Jetson] libOpenCvSharpExtern: cannot open shared object file: No such file or directory

Summary of your issue

I’m trying to use opencvsharp in Jetson. The app is .NET 5 console app. I added OpenCvSharp4 and OpenCvSharp4.runtime.linux-arm. I got error libOpenCvSharpExtern: cannot open shared object file: No such file or directory.

1. I’m not sure about OpenCvSharp4.runtime.linux-arm, can it work for linux-arm64? Or I need to build from source code by myself? If yes, do we have any instruction for this (jetson)?
2. What about OpenCV 4.1.1, is it supported by opencvsharp?

Environment

• Jetson Nano (linux-arm64)
• OpenCV 4.1.1
• .NET 5 Console App

Example code:

var videoCapture = new VideoCapture();

videoCapture.Open(0);

var frame = new Mat();
var frameId = 0;
var maxFrame = 1;
while (videoCapture.IsOpened())
{
    if(videoCapture.Read(frame))
    {
        frameId++;
        var image = BitmapConverter.ToBitmap(frame);
        image.Save($"{frameId}.jpg");

        if (frameId >= maxFrame)
        {
            break;
        }
    }
}

Output:

Unhandled exception. System.TypeInitializationException: The type initializer for 'OpenCvSharp.Internal.NativeMethods' threw an exception.
 ---> System.DllNotFoundException: 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
   at OpenCvSharp.Internal.NativeMethods.redirectError(CvErrorCallback errCallback, IntPtr userdata, IntPtr& prevUserdata)
   at OpenCvSharp.Internal.ExceptionHandler.RegisterExceptionCallback()
   at OpenCvSharp.Internal.NativeMethods.LoadLibraries(IEnumerable`1 additionalPaths)
   at OpenCvSharp.Internal.NativeMethods..cctor()
   --- End of inner exception stack trace ---
   at OpenCvSharp.Internal.NativeMethods.videoio_VideoCapture_new1(IntPtr& returnValue)
   at OpenCvSharp.VideoCapture..ctor()
   at Program.Main(String[] args) in /Program.cs:line 18

[AvenSun]

@leopripos the attached file I built works well on Jetson, but it’s not the latest version. libOpenCvSharpExtern for Jetson you can have a try.

[dev-nextprogress]

Hi and first let me thanks @shimat and all the contributors to this great library. I am having the same question about the linux-arm64 runtime identifier. It appears as if the linux-arm package is not compatible with ARM64. The LoadLibrary call on the linux-arm version fails (I verified that the O/S can find it). I know we could probably try to build it ourselves but it’s a bit of a chore if you are not deeply familiar with CMake and such. So if there are any plans to create a linux-arm64 package that would be great to know. Thanks