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• How to install JavaCV on Android and use FrameGrabber

  9 octobre 2016, par Mark

  Could someone tell me where I’m doing wrong ? These are the steps that I have followed :

  1. Downloaded the adt-bundle-windows from android developer website
  2. Created a new project and a libs/armeabi folder

  3. 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.

     (A part that I don’t understand is "Extract all the *.so files from javacv-android-arm.jar", I simply inserted the javacv-android-arm.jar file inside libs/armeabi folder)

  4. Navigated to Project > Properties > Java Build Path > Libraries and click "Add JARs...".
  5. Selected both javacpp.jar and javacv.jar from the newly created "libs" folder.

  After that I have downloaded OpenCV2.4.3 from here and ffmpeg from here and extracted the files on my C :/ root.
  Finally after setting my system path...,

  C:\opencv\build\x64\vc10\bin;C:\ffmpeg-64\bin;C:\Program Files\Java\jdk1.7.0_10\bin

  ...if I try to use simply FrameGrabber in my Android application...

  import com.googlecode.javacv.FFmpegFrameGrabber;
  
  import com.googlecode.javacpp.Loader;
  
  import com.googlecode.javacv.*;
  
  import com.googlecode.javacv.cpp.*;
  
  import static com.googlecode.javacv.cpp.opencv_core.*;
  
  import static com.googlecode.javacv.cpp.opencv_imgproc.*;
  
  import static com.googlecode.javacv.cpp.opencv_calib3d.*;
  
  import static com.googlecode.javacv.cpp.opencv_objdetect.*;
  
  
  
  import android.os.Bundle;
  
  import android.app.Activity;
  
  import android.view.Menu;
  
  
  
  public class MainActivity extends Activity {
  
  
  
      @Override
  
      protected void onCreate(Bundle savedInstanceState) {
  
          super.onCreate(savedInstanceState);
  
          setContentView(R.layout.activity_main);
  
  
  
          FFmpegFrameGrabber i = new FFmpegFrameGrabber("/mnt/sdcard/SinglePerson.avi"); 
  
      }

  ...I get the following errors :

  01-29 17:59:26.976: E/AndroidRuntime(30656): FATAL EXCEPTION: main
  
  01-29 17:59:26.976: E/AndroidRuntime(30656): java.lang.NoClassDefFoundError: com.googlecode.javacv.FFmpegFrameGrabber
  
  01-29 17:59:26.976: E/AndroidRuntime(30656):    at com.example.xxxxxxxxx.MainActivity.onCreate(MainActivity.java:23)
  
  01-29 17:59:26.976: E/AndroidRuntime(30656):    at android.app.Activity.performCreate(Activity.java:4465)
  
  01-29 17:59:26.976: E/AndroidRuntime(30656):    at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1049)
  
  01-29 17:59:26.976: E/AndroidRuntime(30656):    at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1920)
  
  01-29 17:59:26.976: E/AndroidRuntime(30656):    at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:1981)
  
  01-29 17:59:26.976: E/AndroidRuntime(30656):    at android.app.ActivityThread.access$600(ActivityThread.java:123)
  
  01-29 17:59:26.976: E/AndroidRuntime(30656):    at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1147)
  
  01-29 17:59:26.976: E/AndroidRuntime(30656):    at android.os.Handler.dispatchMessage(Handler.java:99)
  
  01-29 17:59:26.976: E/AndroidRuntime(30656):    at android.os.Looper.loop(Looper.java:137)
  
  01-29 17:59:26.976: E/AndroidRuntime(30656):    at android.app.ActivityThread.main(ActivityThread.java:4424)
  
  01-29 17:59:26.976: E/AndroidRuntime(30656):    at java.lang.reflect.Method.invokeNative(Native Method)
  
  01-29 17:59:26.976: E/AndroidRuntime(30656):    at java.lang.reflect.Method.invoke(Method.java:511)
  
  01-29 17:59:26.976: E/AndroidRuntime(30656):    at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:784)
  
  01-29 17:59:26.976: E/AndroidRuntime(30656):    at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:551)
  
  01-29 17:59:26.976: E/AndroidRuntime(30656):    at dalvik.system.NativeStart.main(Native Method)

  Someone can help me please ?

• How to give a file path in FFmpeg for Android

  10 novembre 2013, par ssrp

  I am developing a movie player using FFmpeg libraries. So far I have built FFmpeg for android and can call a native function through JNI. I want to give a file to be opened by FFMpeg open_file function, I want to know how to give a file to the function that is stored inside the external storage in the device. I am using HTC One x for debugging the app. And I know how to get the absolute path of the file in Java. Please help.

• Prevent "wait for focus" SWF case on legacy devices like HTC Magic Android 2.2, which are Webkit/Safari, lack Flash + HTML5 support and also don't implement document.hasFocus(). https://getsatisfaction.com/schillmania/topics/sm2_fails_to_call_the_timeout_or_onerror_method_when_the_player_cannot_be_loaded

  25 mai 2013, par scottschiller

  Prevent "wait for focus" SWF case on legacy devices like HTC Magic Android 2.2, which are Webkit/Safari, lack Flash + HTML5 support and also don't implement document.hasFocus(). https://getsatisfaction.com/schillmania/topics/sm2_fails_to_call_the_timeout_or_onerror_method_when_the_player_cannot_be_loaded