CODEWITHSUNDEEP
androideclipsejavacv
Mark W
Mark W

Reputation: 213

UnsatisfiedLinkError with JavaCV Android

I am trying get JavaCV working for android in order to gain the use of the FFMPEG library. I'm following the setup instructions for android from the JavaCV website which I've copied below:

Eclipse (Android 2.2 or newer): Follow the instructions on this page: http://developer.android.com/training/basics/firstapp/ Go to File > New > Folder, select your project as parent folder, type "libs/armeabi" as Folder name, and click Finish. Copy javacpp.jar and javacv.jar into the newly created "libs" folder. Extract all the *.so files from javacv-android-arm.jar, opencv-2.4.3-android-arm.zip, and ffmpeg-1.0-android-arm.zip directly into the newly created "libs/armeabi" folder, without creating any new subdirectories. Navigate to Project > Properties > Java Build Path > Libraries and click "Add JARs...". Select both javacpp.jar and javacv.jar from the newly created "libs" folder.

I am trying to use the FFmpegFrameGrabber class in my code. When I run, I get this error from logcat:

02-01 14:40:35.550: W/dalvikvm(11583): Exception Ljava/lang/UnsatisfiedLinkError; thrown while initializing Lcom/googlecode/javacv/cpp/avutil;

02-01 14:40:35.550: W/dalvikvm(11583): Exception Ljava/lang/ExceptionInInitializerError; thrown while initializing Lcom/googlecode/javacv/cpp/avcodec;

02-01 14:40:35.550: D/AndroidRuntime(11583): Shutting down VM

02-01 14:40:35.550: W/dalvikvm(11583): threadid=1: thread exiting with uncaught exception (group=0x40015560)

This led me to believe that my android app can't find avutil.so and avcodec.so, which I placed in the libs/armeabi folder. However, when I unzipped the APK eclipse generated, both so files were present.

Any ideas as to the cause of this problem?

Upvotes: 1

Views: 663

Answers (1)

vxh.viet
vxh.viet

Reputation: 408

For anyone that would come across this problem, I've set up a Gist providing step by step instruction on how to set up JavaCV 1.1 on Android Studio 2.1.1.

This tut will use JavaCV 1.1, version 1.2 currently has SIGSEGV issue. JavaCV 1.1 comes with FFmpeg 2.8.1.

  1. Obtain the prebulit binaries here.
  2. Extract it and copy these files:
    • javacpp.jar (essential).
    • javacv.jar (essential).
    • ffmpeg.jar (essential if you use FFmpeg).
    • ffmpeg-android-arm.jar (for arm CPU).
    • ffmpeg-android-x86.jar (optional for x86 CPU). into the libs folder of your project (app/libs in my case).
  3. Click on app -> F4 -> Dependencies -> + -> File dependencies -> choose all the previous .jar.
  4. Temporarily, because of this issue, we need to set targetSdkVersion 22 the app's build.gradle.
  5. Possibly need to set these packagingOptions in the build.gradle:

android { compileSdkVersion 23 buildToolsVersion "23.0.3"

defaultConfig {
    applicationId "com.example.test"
    minSdkVersion 16
    targetSdkVersion 22
    versionCode 1
    versionName "1.0"
}

packagingOptions {
    exclude 'META-INF/LICENSE.txt'
    exclude 'META-INF/NOTICE.txt'
    exclude 'META-INF/maven/org.bytedeco.javacpp-presets/ffmpeg/pom.properties'
    exclude 'META-INF/maven/org.bytedeco.javacpp-presets/ffmpeg/pom.xml'

    //might need these if you use openCV
    //exclude 'META-INF/maven/org.bytedeco.javacpp-presets/opencv/pom.properties'
    //exclude 'META-INF/maven/org.bytedeco.javacpp-presets/opencv/pom.xml'
}

}

Upvotes: 0

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