How to use GPU?

[CJL6015]

I want to use gpu acceleration in ffmpeg and opencv mat. Is there any doucment or demo?

[saudet]

For FFmpeg, we can use codecs that support GPUs: https://trac.ffmpeg.org/wiki/HWAccelIntro

For OpenCV, use GpuMat and UMat, that's what works on GPU.

[CJL6015]

I use the GpuMat, but n error occurred.

[CJL6015]

This is my GPU

[saudet]

You'll need to use binaries for OpenCV compiled with CUDA, as shown in the README.md file here in the case of Maven:
https://github.com/bytedeco/javacpp-presets/tree/master/opencv#the-pomxml-build-file

[CJL6015]

I add the dependecy of cuda-platform0redist. Do I need to da anything else?

[saudet]

You'll need to make sure the latest version of the drivers for your video card are installed on the system.

[CJL6015]

I have updated the driver to the latest version, but it still doesn't work.

[saudet]

Set the "org.bytedeco.javacpp.logger.debug" system property to "true" to get more messages on the console.

[CJL6015]

Is it so? It doesn't seem to work.

[saudet]

You'll need to set it earlier than that. Anyway, there's also issue #1767 that's been fixed recently, so make sure to give it a try with the snapshots: http://bytedeco.org/builds/

[CJL6015]

I try with the snapshots,but got another error.

[saudet]

That means those functions don't work with GPUs. You'll need to find other (similar) functions that do support GPUs.

In this case, this one should do what you need: http://bytedeco.org/javacpp-presets/opencv/apidocs/org/bytedeco/opencv/global/opencv_cudaimgproc.html#cvtColor-org.bytedeco.opencv.opencv_core.GpuMat-org.bytedeco.opencv.opencv_core.GpuMat-int-int-org.bytedeco.opencv.opencv_core.Stream-

[saudet]

Duplicate of #1767

[CJL6015]

I use the opencv_cudaimgproc.cvtColor,but got another error.

[saudet]

There's some library missing from your system, apparently. Please find out what it is using the Dependencies tool:
https://github.com/bytedeco/javacpp-presets/wiki/Debugging-UnsatisfiedLinkError-on-Windows

[CJL6015]

I use the Dependencies tool,but opencv_cudaimproc and UMat/GpuMat can be loaded normally.Is it because I didn't set the correct module?

[saudet]

You'll need to give it the correct path to the DLL, if that's what you mean, yes. Look inside the JAR file to make sure you have it correctly.

[CJL6015]

I mean opencv_cudaimgproc can be loaded normally without UnstatisfiedLinkError

[saudet]

So, everything should be working fine. I don't know what you tell you more.
For me on Windows 10, opencv_cudaimgproc.cvtColor() works perfectly.

[CJL6015]

My system is Winows 11. Will this matter?

[saudet]

I don't think so, but you can try it on Windows 10 to see if it makes a difference.

[CJL6015]

Could it be that the package I imported is wrong? I found a same question on stackoverflow:https://stackoverflow.com/questions/56944945/javacv-with-java-lang-unsatisfiedlinkerror.
Here are the packages I'm imported.

[saudet]

That doesn't matter. Make sure the "org.bytedeco.javacpp.logger.debug" system property is set to "true" to get possibly useful information displayed on the console.

[CJL6015]

the "org.bytedeco.javacpp.logger.debug" system property is set to "true",but no more information.

[saudet]

It needs to be set earlier.

[CJL6015]

These libraries failed to load.
`

Debug: Loading library zlibwapi
Debug: Failed to load for zlibwapi: java.lang.UnsatisfiedLinkError: no zlibwapi in java.library.path
Debug: Loading library cudart64_110
Debug: Failed to load for cudart64_110: java.lang.UnsatisfiedLinkError: no cudart64_110 in java.library.path
Debug: Loading library cublasLt64_11
Debug: Failed to load for cublasLt64_11: java.lang.UnsatisfiedLinkError: no cublasLt64_11 in java.library.path
Debug: Loading library cublas64_11
Debug: Failed to load for cublas64_11: java.lang.UnsatisfiedLinkError: no cublas64_11 in java.library.path
Debug: Loading library cufft64_10
Debug: Failed to load for cufft64_10: java.lang.UnsatisfiedLinkError: no cufft64_10 in java.library.path
Debug: Loading library cudnn64_8
Debug: Failed to load for cudnn64_8: java.lang.UnsatisfiedLinkError: no cudnn64_8 in java.library.path
Debug: Loading library nppc64_11
Debug: Failed to load for nppc64_11: java.lang.UnsatisfiedLinkError: no nppc64_11 in java.library.path
Debug: Loading library nppial64_11
Debug: Failed to load for nppial64_11: java.lang.UnsatisfiedLinkError: no nppial64_11 in java.library.path
Debug: Loading library nppicc64_11
Debug: Failed to load for nppicc64_11: java.lang.UnsatisfiedLinkError: no nppicc64_11 in java.library.path
Debug: Loading library nppicom64_11
Debug: Failed to load for nppicom64_11: java.lang.UnsatisfiedLinkError: no nppicom64_11 in java.library.path
Debug: Loading library nppidei64_11
Debug: Failed to load for nppidei64_11: java.lang.UnsatisfiedLinkError: no nppidei64_11 in java.library.path
Debug: Loading library nppif64_11
Debug: Failed to load for nppif64_11: java.lang.UnsatisfiedLinkError: no nppif64_11 in java.library.path
Debug: Loading library nppig64_11
Debug: Failed to load for nppig64_11: java.lang.UnsatisfiedLinkError: no nppig64_11 in java.library.path
Debug: Loading library nppim64_11
Debug: Failed to load for nppim64_11: java.lang.UnsatisfiedLinkError: no nppim64_11 in java.library.path
Debug: Loading library nppist64_11
Debug: Failed to load for nppist64_11: java.lang.UnsatisfiedLinkError: no nppist64_11 in java.library.path
Debug: Loading library nppisu64_11
Debug: Failed to load for nppisu64_11: java.lang.UnsatisfiedLinkError: no nppisu64_11 in java.library.path
Debug: Loading library nppitc64_11
Debug: Failed to load for nppitc64_11: java.lang.UnsatisfiedLinkError: no nppitc64_11 in java.library.path
Debug: Loading library npps64_11
Debug: Failed to load for npps64_11: java.lang.UnsatisfiedLinkError: no npps64_11 in java.library.path
Debug: Loading library cudnn_ops_infer64_8
Debug: Failed to load for cudnn_ops_infer64_8: java.lang.UnsatisfiedLinkError: no cudnn_ops_infer64_8 in java.library.path
Debug: Loading library cudnn_ops_train64_8
Debug: Failed to load for cudnn_ops_train64_8: java.lang.UnsatisfiedLinkError: no cudnn_ops_train64_8 in java.library.path
Debug: Loading library cudnn_adv_infer64_8
Debug: Failed to load for cudnn_adv_infer64_8: java.lang.UnsatisfiedLinkError: no cudnn_adv_infer64_8 in java.library.path
Debug: Loading library cudnn_adv_train64_8
Debug: Failed to load for cudnn_adv_train64_8: java.lang.UnsatisfiedLinkError: no cudnn_adv_train64_8 in java.library.path
Debug: Loading library cudnn_cnn_infer64_8
Debug: Failed to load for cudnn_cnn_infer64_8: java.lang.UnsatisfiedLinkError: no cudnn_cnn_infer64_8 in java.library.path
Debug: Loading library cudnn_cnn_train64_8
Debug: Failed to load for cudnn_cnn_train64_8: java.lang.UnsatisfiedLinkError: no cudnn_cnn_train64_8 in java.library.path
`

[saudet]

That just means the redist artifact isn't on the class path. You'll need to add it, or install CUDA on your machine.