OpenCvSharp4.runtime.linux-arm doesn't work on raspberry pi 4 #1263

dseferlis · 2021-05-13T05:58:20Z

Summary of issue

Hello everyone.
First of all thank you for your effort to make this lib.
Trying to use opencvsharp on an image capture app on a raspberry pi. Installed the OpenCvSharp4.runtime.linux-arm nuget package thinking of this is what I need.
Although I get the error bellow.
Is there something I can do to make it work?

Environment

Raspberry pi model 4 4GB
OS: Raspbian 10 buster (armv7l)
Project framework: .net 5

Example code:

using OpenCvSharp;

namespace OpencvTest.Console
{
    class Program
    {
        static void Main(string[] args) {
            var capture = new VideoCapture(0);
            var window = new Window("Test");
            var image = new Mat();
            while (true) {
                capture.Read(image);
                if (image.Empty()) {
                    break;
                }
                
                window.ShowImage(image);
                if (Cv2.WaitKey(1) == 113) {
                    break;
                }
            }
            System.Console.WriteLine("Hello World!");
        }
    }
}

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: wrong ELF class: ELFCLASS64
   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_new3(Int32 device, Int32 apiPreference, IntPtr& returnValue)
   at OpenCvSharp.VideoCapture..ctor(Int32 index, VideoCaptureAPIs apiPreference)
   at OpencvTest.Console.Program.Main(String[] args)

The text was updated successfully, but these errors were encountered:

AvenSun · 2021-05-13T16:20:35Z

you should check dependency of native library as follows
ldd ./lib/OpenCvSharpExtern.so
Do use full path of library, find all marked "not found" then install .
but the best way is building OpenCvSharpExtern library on Pi 4.

dseferlis · 2021-05-14T07:17:26Z

Thanks for reply.
Project build produces a libOpenCvSharpExtern.so. Running ldd libOpenCvSharpExtern.so (even with full path) i get the error "not a dynamic executable". Am I missing something?

EDIT: using file libOpenCvSharpExtern.so i get:
libOpenCvSharpExtern.so: ELF 64-bit LSB shared object, x86-64, version 1 (GNU/Linux), dynamically linked, BuildID[sha1]=2feb0d05276a0f30a7e6c2669610ca40685c2dca, not stripped

AvenSun · 2021-05-16T09:29:58Z

@bitdeli-chef

EDIT: using file libOpenCvSharpExtern.so i get:
libOpenCvSharpExtern.so: ELF 64-bit LSB shared object, x86-64, version 1 (GNU/Linux), dynamically linked, BuildID[sha1]=2feb0d05276a0f30a7e6c2669610ca40685c2dca, not stripped

It seems that libOpenCvSharpExtern.so (64 bit) you're referred is not a valid library for current OS .
Is your OS 32bit ?

dseferlis · 2021-05-16T19:38:54Z

Is your OS 32bit ?

Yes. It's the default for raspberry i think. At least in the official imager.

AvenSun · 2021-05-17T02:26:36Z

that's the problem
32-bit OS can not invoke 64-bit library .

dseferlis · 2021-05-18T07:19:17Z

So I should build library on pi i guess.
Is there plans to release lib for arm32?

AvenSun · 2021-05-18T07:29:21Z

If you would like to use OpenCvSharp on arm32
yes, you have to build it on your own.
actually Pi 4 is 64 bit SOC, you can also try 64-bit OS.

dseferlis · 2021-05-18T09:12:58Z

Thank you!!! I hadn't realize Pi can run 64bit OS...

dseferlis · 2021-05-18T10:46:52Z

What I don't get is that building project for linux-arm, which produces 32bit executable, libOpenCvSharpExtern.so is included in output directory, but when building for linux-arm64, which produces 64bit executable, libOpenCvSharpExtern.so is not included.

AvenSun · 2021-05-23T13:23:31Z

I can build it successfully on Jetson family (arm64).
you should check the log

jblam · 2021-06-23T05:46:57Z

libOpenCvSharpExtern.so: ELF 64-bit LSB shared object, x86-64, version 1 (GNU/Linux), dynamically linked, BuildID[sha1]=2feb0d05276a0f30a7e6c2669610ca40685c2dca, not stripped

It seems that libOpenCvSharpExtern.so (64 bit) you're referred is not a valid library for current OS .

I'd just note that the latest version of the OpenCvSharp4.runtime.linux-arm nuget package (currently 4.5.2.20210507) includes the x84-64 binary, not an ARM binary. So the package is guaranteed never to work, as I understand it.

I'd suggest unlisting that package, to avoid having other people encounter this problem and leave comments on this issue :)

GitNao · 2021-07-10T03:14:47Z

try this (GitNao@080b355#diff-f260d80d63498fdd7fb8dab34c17d5002bdf2249912fcbd1c7af7825f81b7ba7)

use Pi3B+

libOpenCvSharpExtern.so (https://github.com/GitNao/opencvsharp/suites/3203466114/artifacts/74081383)
rename .nupkg -> .zip

GitNao · 2021-07-10T06:36:51Z

libavcodec.so.57 => not found
libavformat.so.57 => not found
libavutil.so.55 => not found
libswscale.so.4 => not found

libOpenCvSharpExtern.so (https://github.com/GitNao/opencvsharp/actions/runs/1017218277)

libavcodec.so.58 => /lib/arm-linux-gnueabihf/neon/vfp/libavcodec.so.58 (0x738f4000)
libavformat.so.58 => /lib/arm-linux-gnueabihf/neon/vfp/libavformat.so.58 (0x736ca000)
libavutil.so.56 => /lib/arm-linux-gnueabihf/neon/vfp/libavutil.so.56 (0x73641000)
libswscale.so.5 => /lib/arm-linux-gnueabihf/neon/vfp/libswscale.so.5 (0x735c6000)

jblam · 2021-07-16T00:51:43Z

@GitNao this looks great! Unfortunately I've since removed my dependency on OpenCV so I'm not in a position to verify the change.

starrynightok · 2021-08-02T01:44:15Z

I encountered the same problem on arm64，and cross-compile this library. it took effect.

obie73 · 2021-09-25T16:27:49Z

I encountered the same problem on arm64, and cross-compile this library. it took effect.

Did you compile on an Apple M1?

CobraCalle · 2021-12-16T12:34:03Z

Hello,

because there is an "arm64" nuget too, I ran into the same problem, because I would like to use the "original" raspberry os. I have to access the camera through mmal, and under 64bit debian I cannot access video frames larger than 2mp, but I have a 12mp camera attached)... I think that is because mmal(sharp) is not 100% officially supported under debian (64bit), so I would like to go back to 32bite rapbian...

I 32-bit nuget would be great, because than ir would be much mor easy to switch to a newer version.

thanks

carl

timstokman · 2022-01-11T00:26:04Z

libOpenCvSharpExtern.so: ELF 64-bit LSB shared object, x86-64, version 1 (GNU/Linux), dynamically linked, BuildID[sha1]=2feb0d05276a0f30a7e6c2669610ca40685c2dca, not stripped

It seems that libOpenCvSharpExtern.so (64 bit) you're referred is not a valid library for current OS .

I'd just note that the latest version of the OpenCvSharp4.runtime.linux-arm nuget package (currently 4.5.2.20210507) includes the x84-64 binary, not an ARM binary. So the package is guaranteed never to work, as I understand it.

I'd suggest unlisting that package, to avoid having other people encounter this problem and leave comments on this issue :)

Noticed the same thing. They do have a workflow for linux-arm, I wonder what is going on there: https://github.com/shimat/opencvsharp/blob/master/.github/workflows/linux-arm.yml. Might be it's just attaching the wrong artifact to the linux-arm package. It's building the 32 bits version for arm, I'd expect a 64 bits version somewhere as well, but I can only see I arm64 cuda version that seems a little behind version-wise.

syamaner · 2022-05-18T19:09:13Z

A bit late to the discussion but recently I experienced a similar issue too. If using Docker to run on Raspberry Pi, building OpenCV and OpenCvSharp as a multi architecture Docker build and then copy the native libraries to the target image when building the application.

Here is an example: https://github.com/syamaner/docker-multi-arch-opencvsharp/tree/main/docker
And a bit more in the post: https://dev.to/syamaner/docker-multi-architecture-net-60-and-opencvsharp-1okd

Essentially all it does is to build both libraries, copy libOpenCvSharpExtern.so and all dependencies to /artifacts directory. Then when building an application image, use it as a stage to copy contents of the /artifacts into the target image. the build image is only 94 to 125 mb depending on target architecture:

https://hub.docker.com/repository/docker/syamaner/opencvsharp-build/tags

This way I only need to add OpenCvSharp4 as a package reference and native bindings will be handled at Docker build time when building the application image. I have tested using 32 and 64 bit OS on Raspberry pi including official Rabpbian as well as Ubuntu 20.04 and 22.04.

Hope it helps.

shenlongju · 2022-10-30T13:33:55Z

有可供下载使用的文件吗，不想从头编译了

AvenSun · 2022-10-31T07:07:48Z

@shenlongju
the attached file I built works well on Jetson, but it's not the latest version.
It should work on all arm64/aarch64 platform, you can have a try.
libOpenCvSharpExtern for Jetson(arm64/aarch64)

shenlongju · 2022-10-31T07:29:01Z

thank you, but I need arm32 version. it will run in orangepi zero , ubuntu 18.04 arm

…

------------------ 原始邮件 ------------------ 发件人: "shimat/opencvsharp" ***@***.***>; 发送时间: 2022年10月31日(星期一) 下午3:08 ***@***.***>; ***@***.******@***.***>; 主题: Re: [shimat/opencvsharp] OpenCvSharp4.runtime.linux-arm doesn't work on raspberry pi 4 (#1263) @shenlongju the attached file I built works well on Jetson, but it's not the latest version. It should work on all arm64/aarch64 platform, you can have a try. libOpenCvSharpExtern for Jetson(arm64/aarch64) — Reply to this email directly, view it on GitHub, or unsubscribe. You are receiving this because you were mentioned.Message ID: ***@***.***>

mimimiaomiao1 · 2022-11-30T01:52:57Z

@shenlongju我构建的附件在 Jetson 上运行良好，但它不是最新版本。它应该适用于所有arm64 / aarch64平台，您可以尝试一下。libOpenCvSharpExtern for Jetson（arm64/aarch64）

Raspberry arm64 tips

AvenSun · 2022-11-30T02:47:23Z

@OaimIsGnay
you can try install it via
apt install libjpeg-turbo8

mimimiaomiao1 · 2022-11-30T03:25:03Z

@OaimIsGnay you can try install it via apt install libjpeg-turbo8

hello . can't find

mimimiaomiao1 · 2022-11-30T03:25:26Z

Can you tell me the source?

AvenSun · 2022-11-30T06:24:37Z

apt update first then try it again

mimimiaomiao1 · 2022-11-30T09:30:00Z

apt update first then try it again

Does not work Please give me your source address

vnetb · 2022-11-30T17:26:01Z

I use this on my Raspi.

 $ ldd libOpenCvSharpExtern.so | grep jpeg
        libjpeg.so.62 => /lib/aarch64-linux-gnu/libjpeg.so.62

#1497 (comment)

AvenSun · 2022-12-05T06:21:21Z

apt update first then try it again

Does not work Please give me your source address

https://github.com/libjpeg-turbo/libjpeg-turbo

stale · 2023-06-10T13:53:23Z

This issue has been automatically marked as stale because it has not had recent activity. It will be closed if no further activity occurs. Thank you for your contributions.

hongzhuoxx · 2024-03-01T08:27:10Z

Nuget Install Sdcb.OpenCvSharp4.mini.runtime.debian.12-arm64 or Sdcb.OpenCvSharp4.mini.runtime.ubuntu.22.04-arm64

#========================================================================

Linux orangepi5plus 5.10.160-rockchip-rk3588 #1.0.8 SMP Fri Nov 10 17:58:32 CST 2023 aarch64 GNU/Linux

Distributor ID: Debian
Description: Debian GNU/Linux 12 (bookworm)
Release: 12
Codename: bookworm

#========================================================================

Test OK！

dseferlis closed this as completed May 18, 2021

dseferlis reopened this May 18, 2021

vnetb mentioned this issue Nov 17, 2022

arm runtime nuget package include wrong so lib. #1497

Closed

stale bot added the wontfix label Jun 10, 2023

stale bot closed this as completed Jun 18, 2023

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OpenCvSharp4.runtime.linux-arm doesn't work on raspberry pi 4 #1263

OpenCvSharp4.runtime.linux-arm doesn't work on raspberry pi 4 #1263

dseferlis commented May 13, 2021 •

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AvenSun commented May 23, 2021

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GitNao commented Jul 10, 2021

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obie73 commented Sep 25, 2021

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syamaner commented May 18, 2022

shenlongju commented Oct 30, 2022

AvenSun commented Oct 31, 2022

shenlongju commented Oct 31, 2022 via email

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AvenSun commented Nov 30, 2022

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AvenSun commented Nov 30, 2022

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OpenCvSharp4.runtime.linux-arm doesn't work on raspberry pi 4 #1263

OpenCvSharp4.runtime.linux-arm doesn't work on raspberry pi 4 #1263

Comments

dseferlis commented May 13, 2021 • edited Loading

Summary of issue

Environment

Example code:

Output:

AvenSun commented May 13, 2021

dseferlis commented May 14, 2021 • edited Loading

AvenSun commented May 16, 2021 • edited Loading

dseferlis commented May 16, 2021 • edited Loading

AvenSun commented May 17, 2021

dseferlis commented May 18, 2021

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dseferlis commented May 18, 2021 • edited Loading

AvenSun commented May 23, 2021

jblam commented Jun 23, 2021

GitNao commented Jul 10, 2021

GitNao commented Jul 10, 2021

jblam commented Jul 16, 2021

starrynightok commented Aug 2, 2021

obie73 commented Sep 25, 2021

CobraCalle commented Dec 16, 2021

timstokman commented Jan 11, 2022 • edited Loading

syamaner commented May 18, 2022

shenlongju commented Oct 30, 2022

AvenSun commented Oct 31, 2022

shenlongju commented Oct 31, 2022 via email

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AvenSun commented Nov 30, 2022

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