Javacv: java cv 1.5.2 openblas

[xiaos]

Hi

I just update javacv from 1.5.0 to 1.5.2.

Previously i am using ffmpeg and opencv libs only, but now i found opencv is denpend on openblas, so i have to include openblas in my libs also?

[saudet]

Yes, that's correct, we need OpenBLAS.

[xiaos]

Thanks, do you have any suggestions to reduce the size of library.

Because i am using this great library to develop mobiel apps, so the size is important!

[saudet]

OpenCV can't use OpenBLAS on Android or iOS anyway, so no need to include it.

[xiaos]

Hi the problem is if i don't include it, it will will throw exception when i am using :

CV_RGB((double) Color.red(bgColor), (double) Color.green(bgColor), (double) Color.blue(bgColor));

Rejecting re-init on previously-failed class java.lang.Class: java.lang.NoClassDefFoundError: Failed resolution of: Lorg/bytedeco/openblas/presets/openblas;
2019-11-09 13:46:23.186 29504-30155/com.. I/ps.: at java.lang.annotation.Annotation java.lang.Class.getDeclaredAnnotation(java.lang.Class) (Class.java:-2)
2019-11-09 13:46:23.186 29504-30155/com. I/ps.: at java.lang.annotation.Annotation java.lang.Class.getAnnotation(java.lang.Class) (Class.java:2488)
2019-11-09 13:46:23.186 29504-30155/com. I/ps.: at boolean org.bytedeco.javacpp.Loader.checkPlatform(java.lang.Class, java.util.Properties) (Loader.java:964)
2019-11-09 13:46:23.186 29504-30155/com. I/ps.: at java.lang.String org.bytedeco.javacpp.Loader.load(java.lang.Class, java.util.Properties, boolean) (Loader.java:1080)
2019-11-09 13:46:23.186 29504-30155/com. I/ps.: at java.lang.String org.bytedeco.javacpp.Loader.load() (Loader.java:1042)
2019-11-09 13:46:23.186 29504-30155/com. I/ps.: at void org.bytedeco.opencv.global.opencv_core.() (opencv_core.java:15)
2019-11-09 13:46:23.186 29504-30155/com. I/ps.: at org.bytedeco.opencv.opencv_core.CvScalar org.bytedeco.opencv.global.opencv_core.cvScalar(double, double, double, double) (opencv_core.java:-2)
2019-11-09 13:46:23.186 29504-30155/com. I/ps.: at org.bytedeco.opencv.opencv_core.CvScalar org.bytedeco.opencv.helper.opencv_core.CV_RGB(double, double, double) (opencv_core.java:32)

[xiaos]

@saudet can you plz give me an suggestion ? thanks.

[saudet]

Ah, yes, the presets do load OpenBLAS anyway... We should change that.

[xiaos]

@saudet so u mean i have to wait for the next version to fix? thanks

[xiaos]

Hi @saudet do you mind let me know how to remove openlab reference? e.g which file/files?

[saudet]

Probably only these 2 files:
https://github.com/bytedeco/javacpp-presets/blob/master/opencv/cppbuild.sh
https://github.com/bytedeco/javacpp-presets/blob/master/opencv/src/main/java/org/bytedeco/opencv/presets/opencv_core.java
But like I said, look for any references to OpenBLAS and try to just remove them.

[xiaos]

But in the opencv code, there are quite a lot of java references.

[saudet]

You can ignore the files in src/gen, those get regenerated at build time.

I forgot to mention that we should modify the pom.xml files as well, but that should be it:
https://github.com/bytedeco/javacpp-presets/blob/master/opencv/pom.xml
https://github.com/bytedeco/javacpp-presets/blob/master/opencv/platform/pom.xml

[xiaos]

But i did see some error because of this:

[saudet]

Ok, try to remove the files from the src/gen subdirectory.

[xiaos]

Thanks, I can build openc and ffmpeg now, and it works.

Btw, may i know how to build javacv? Just encounter some java build error.

[saudet]

JavaCV doesn't contain any native code, so a simple mvn clean install works.

[DonyellFonk]

Hi @saudet,

I'm using javaCV version 1.5.3, but I also receive the same error:

java.lang.NoClassDefFoundError: Failed resolution of: Lorg/bytedeco/openblas/presets/openblas;
        at java.lang.Class.getDeclaredAnnotation(Native Method)
        at java.lang.Class.getAnnotation(Class.java:2488)
        at org.bytedeco.javacpp.Loader.checkPlatform(Loader.java:964)
        at org.bytedeco.javacpp.Loader.load(Loader.java:1080)
        at org.bytedeco.javacpp.Loader.load(Loader.java:1058)
        at org.bytedeco.javacv.OpenCVFrameConverter.<clinit>(OpenCVFrameConverter.java:43)

I saw that you suggested removing the src/gen directory, but I'm unable to find that directory.
Can you help me?

[saudet]

@DonyellFonk As per above, you'll need to include the presets for OpenBLAS in the class path.

[DonyellFonk]

@saudet

OpenCV can't use OpenBLAS on Android or iOS anyway, so no need to include it.

Sorry, I forgot to mention it, I'm using this library in an Android app. Do I still need to include OpenBLAS?

[saudet]

Yes, unless you rebuild from source as per @xiaos

[xiaos]

Hi @saudet , i have one question, after i built the ffmpeg, where can i find the ffmpeg header files?

[saudet]

They should be under ffmpeg/cppbuild//include

[xiaos]

got it, thanks!

[Alesh17]

Hello again!

In question #1527 you wrote me that I should add OpenBLAS dependency. But judging by this thread in the case of development for android, should I remove all dependencies on openblas (as it is said here)?

Do you mean here to add javacv as a separate module (not through dependencies in gradle) and remove all mentions of openblas from there?

[saudet]

Any of those options work fine, but if you're just trying to get JavaCV
running, the platform plugin of Gradle JavaCPP is easiest:
https://github.com/bytedeco/gradle-javacpp#the-platform-plugin

[Alesh17]

Hello!

I tried your solution (with the platform plugin of Gradle JavaCPP). It works with versions like this:

plugins {
    id 'com.android.library'
    id 'kotlin-android'
    id 'kotlin-android-extensions'
    id 'org.bytedeco.gradle-javacpp-platform' version "1.5.4"
}

ext {
    javacppPlatform = 'android-arm,android-arm64'
}

android { ... }

dependencies {

...

implementation group: 'org.bytedeco', name: 'javacpp', version: '1.5.2'
implementation group: 'org.bytedeco', name: 'openblas', version: '0.3.7-1.5.2'
implementation group: 'org.bytedeco', name: 'openblas', version: '0.3.7-1.5.2', classifier: "android-arm"
implementation group: 'org.bytedeco', name: 'openblas', version: '0.3.7-1.5.2', classifier: "android-arm64"
implementation group: 'org.bytedeco', name: 'opencv', version: '4.1.2-1.5.2'
implementation group: 'org.bytedeco', name: 'opencv', version: '4.1.2-1.5.2', classifier: "android-arm"
implementation group: 'org.bytedeco', name: 'opencv', version: '4.1.2-1.5.2', classifier: "android-arm64"

}

But with this versions:

implementation group: 'org.bytedeco', name: 'javacpp', version: '1.5.4'

implementation group: 'org.bytedeco', name: 'openblas', version: '0.3.10-1.5.4'
implementation group: 'org.bytedeco', name: 'openblas', version: '0.3.10-1.5.4', classifier: "android-arm"
implementation group: 'org.bytedeco', name: 'openblas', version: '0.3.10-1.5.4', classifier: "android-arm64"

implementation group: 'org.bytedeco', name: 'opencv', version: '4.4.0-1.5.4'
implementation group: 'org.bytedeco', name: 'opencv', version: '4.4.0-1.5.4', classifier: "android-arm"
implementation group: 'org.bytedeco', name: 'opencv', version: '4.4.0-1.5.4', classifier: "android-arm64"

I got this this type of error:

More than one file was found with OS independent path 'META-INF/native-image/android-arm64/jnijavacpp/jni-config.json'.

I tried all the approaches from #353, but none of them suited me :(

[saudet]

Those files are not needed by Android. You can exclude them.

[Alesh17]

I tried to exclude them like this:

packagingOptions {
      exclude 'META-INF/native-image/android-arm64/jnijavacpp/jni-config.json'
}

And like this:

implementation (group: 'org.bytedeco', name: 'javacpp', version: '1.5.4') {
        exclude group: 'org.bytedeco.javacpp', module: 'android-arm64'
}

In both cases the error did not go anywhere

[saudet]

You need to add it in the android { } block, like this: https://stackoverflow.com/a/47509465/523744

[Alesh17]

Ofc i add it to android { } block, like this:

android {

    ...

    packagingOptions {
        exclude 'META-INF/DEPENDENCIES'
        exclude 'META-INF/LICENSE'
        exclude 'META-INF/LICENSE.txt'
        exclude 'META-INF/license.txt'
        exclude 'META-INF/NOTICE'
        exclude 'META-INF/NOTICE.txt'
        exclude 'META-INF/notice.txt'
        exclude 'META-INF/ASL2.0'
        exclude("META-INF/*.kotlin_module")
        exclude 'META-INF/native-image/android-arm64/jnijavacpp/jni-config.json'
    }
}

[saudet]

Ok, good, so that works. You'll need to do the same for the other .json files too.

[Alesh17]

I apologize for the understatement. I meant that this type of exclude did not work for me.

[saudet]

I'm pretty sure it works, you just have to make sure to exclude all the JSON files. There's more than one of them.

[Alesh17]

I try to exclude this JSON files:

exclude 'META-INF/native-image/android-arm64/jnijavacpp/jni-config.json'
exclude 'META-INF/native-image/android-arm/jnijavacpp/jni-config.json'
exclude 'META-INF/native-image/android-x86/jnijavacpp/jni-config.json'
exclude 'META-INF/native-image/android-x86_64/jnijavacpp/jni-config.json'

But i still have this type of error:

More than one file was found with OS independent path 'META-INF/native-image/android-x86_64/jnijavacpp/jni-config.json'

I'm out of ideas for other files to exclude...

[saudet]

Maybe the paths have to start with "/"? According to the documentation here, for example, that looks necessary:
https://google.github.io/android-gradle-dsl/3.2/com.android.build.gradle.internal.dsl.PackagingOptions.html
In any case, this is an issue with Android, so be sure to ask upstream! Thank you

[Alesh17]

I solved the problem.

• First of all, packagingOptions { exclude } did't work for me, because i have multimodule project and add exclude not for app module.

• Secondly, we must exclude such a list of files (jni-config.json & reflect-config.json):

packagingOptions {
        exclude 'META-INF/native-image/android-arm/jnijavacpp/jni-config.json'
        exclude 'META-INF/native-image/android-arm/jnijavacpp/reflect-config.json'
        exclude 'META-INF/native-image/android-arm64/jnijavacpp/jni-config.json'
        exclude 'META-INF/native-image/android-arm64/jnijavacpp/reflect-config.json'
    }

• And finally, an example of how a gradle file (app module) should be:

plugins {
    id 'com.android.application'
    id 'kotlin-android'
    id 'kotlin-android-extensions'
    id 'org.bytedeco.gradle-javacpp-platform' version "1.5.4"
}

android {

    packagingOptions {
        exclude 'META-INF/native-image/android-arm/jnijavacpp/jni-config.json'
        exclude 'META-INF/native-image/android-arm/jnijavacpp/reflect-config.json'
        exclude 'META-INF/native-image/android-arm64/jnijavacpp/jni-config.json'
        exclude 'META-INF/native-image/android-arm64/jnijavacpp/reflect-config.json'
    }

    ...

    kotlinOptions {
        jvmTarget = "1.8"
    }
}

def openblas = '0.3.10'
def javacv = "1.5.4"
def opencv = "4.4.0"

dependencies {

   ...

   api "org.bytedeco:openblas:${openblas}-${javacv}",
   api "org.bytedeco:openblas:${openblas}-${javacv}:android-arm",
   api "org.bytedeco:openblas:${openblas}-${javacv}:android-arm64",
   api "org.bytedeco:opencv:${opencv}-${javacv}",
   api "org.bytedeco:opencv:${opencv}-${javacv}:android-arm",
   api "org.bytedeco:opencv:${opencv}-${javacv}:android-arm64"
}

[saudet]

• Secondly, we must exclude such a list of files (jni-config.json & reflect-config.json):

Something like exclude 'META-INF/native-image/**' probably works just as fine though.