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• What is the difference between FFmpeg Android and FFmpeg Android Java ?

  28 avril 2015, par Juliano Nunes Silva Oliveira

  I’m trying to use FFmpeg in a new app and found these two repositories on GitHub : http://hiteshsondhi88.github.io/ffmpeg-android/ and http://hiteshsondhi88.github.io/ffmpeg-android-java/.

  What are their differences ? I mean, Android NDK is just a way to put native code together with your Java code, right ? If so, using FFmpeg-android as a shared native library and using FFmpeg-android-java which seems to be a java library that encapsulates calls to the shared native library, are the same thing. Or am I wrong ?

  Thank you

• UnsatisfiedLinkError for armeabi with Android Studio on Ubuntu but with Android Studio on Windows it works

  14 juillet 2015, par dddog

  I’m working at an Android app that uses ffmpeg-android-arm.jar who contains native libs for video/audio encoding.
  My native libs are included in the project by copying the ffmpeg-android-arm.jar in the app/libs folder. ffmpeg-android-arm.jar is just an archive having the following folder structure lib/armeabi/ and in the armeabi folder being all the native libs as .so files.

  Building the apk using Android Studio on Windows 8 works just fine, the statement bellow, being the first that wants to load a native library working well.

  //neon library optimized for opencv
  
  static {
  
      Log.d(TAG, "about to load library checkneon...");
  
      try {
  
          System.loadLibrary("checkneon");
  
      } catch (Exception e) {
  
          e.printStackTrace();
  
      } catch (Error error) {
  
          error.printStackTrace(System.out);
  
      }
  
      Log.d(TAG, "library checkneon loaded!");
  
  }

  Going on Android Studio running on Ubuntu 14.04.02, I’m unable to make my project run, as I keep receiving java.lang.UnsatisfiedLinkError. See the stack trace bellow :

  07-14 20:41:05.616  17018-17018/? D/dalvikvm﹕ Late-enabling CheckJNI
  
  07-14 20:41:05.786  17018-17018/org.myfrogvrvp8 D/RecordActivity﹕ about to load library checkneon...
  
  07-14 20:41:05.786  17018-17018/org.myfrogvrvp8 I/System.out﹕ java.lang.UnsatisfiedLinkError: Couldn't load checkneon from loader dalvik.system.PathClassLoader[dexPath=/data/app/org.myfrogvrvp8-2.apk,libraryPath=/data/app-lib/org.myfrogvrvp8-2]: findLibrary returned null
  
  07-14 20:41:05.791  17018-17018/org.myfrogvrvp8 I/System.out﹕ at java.lang.Runtime.loadLibrary(Runtime.java:355)
  
  07-14 20:41:05.791  17018-17018/org.myfrogvrvp8 I/System.out﹕ at java.lang.System.loadLibrary(System.java:525)
  
  07-14 20:41:05.791  17018-17018/org.myfrogvrvp8 I/System.out﹕ at org.myfrogvrvp8.FFmpegRecorderActivity.<clinit>(FFmpegRecorderActivity.java:189)
  
  07-14 20:41:05.791  17018-17018/org.myfrogvrvp8 I/System.out﹕ at java.lang.Class.newInstanceImpl(Native Method)
  
  07-14 20:41:05.791  17018-17018/org.myfrogvrvp8 I/System.out﹕ at java.lang.Class.newInstance(Class.java:1130)
  
  07-14 20:41:05.791  17018-17018/org.myfrogvrvp8 I/System.out﹕ at android.app.Instrumentation.newActivity(Instrumentation.java:1078)
  
  07-14 20:41:05.791  17018-17018/org.myfrogvrvp8 I/System.out﹕ at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2210)
  
  07-14 20:41:05.791  17018-17018/org.myfrogvrvp8 I/System.out﹕ at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2349)
  
  07-14 20:41:05.791  17018-17018/org.myfrogvrvp8 I/System.out﹕ at android.app.ActivityThread.access$700(ActivityThread.java:159)
  
  07-14 20:41:05.791  17018-17018/org.myfrogvrvp8 I/System.out﹕ at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1316)
  
  07-14 20:41:05.791  17018-17018/org.myfrogvrvp8 I/System.out﹕ at android.os.Handler.dispatchMessage(Handler.java:99)
  
  07-14 20:41:05.791  17018-17018/org.myfrogvrvp8 I/System.out﹕ at android.os.Looper.loop(Looper.java:176)
  
  07-14 20:41:05.791  17018-17018/org.myfrogvrvp8 I/System.out﹕ at android.app.ActivityThread.main(ActivityThread.java:5419)
  
  07-14 20:41:05.791  17018-17018/org.myfrogvrvp8 I/System.out﹕ at java.lang.reflect.Method.invokeNative(Native Method)
  
  07-14 20:41:05.791  17018-17018/org.myfrogvrvp8 I/System.out﹕ at java.lang.reflect.Method.invoke(Method.java:525)
  
  07-14 20:41:05.796  17018-17018/org.myfrogvrvp8 I/System.out﹕ at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1046)
  
  07-14 20:41:05.796  17018-17018/org.myfrogvrvp8 I/System.out﹕ at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:862)
  
  07-14 20:41:05.796  17018-17018/org.myfrogvrvp8 I/System.out﹕ at dalvik.system.NativeStart.main(Native Method)
  
  </clinit>

  I’ve checked both apks, and they both have the native .so files included in the lib/armeabi folder.

  I’m quite puzzled...
  Any help much appreciated !

• After a clean install of OpenCV via pip it throws an ImportError : DLL load failed

  20 juin 2017, par Kev1n91

  After installing OpenCV via pip on Windows 10 with :

  pip install opencv-python

  I can not import the module. When executing the command :

  import cv2

  I get the error :

  File "C :\ProgramData\Anaconda3\lib\site-packages\cv2__init__.py",
  line 7, in
  from . import cv2

  ImportError : DLL load failed :...

  If I look into the file throwing the code, it looks like the following :

  import sys
  
  import os
  
  
  
  # FFMPEG dll is not found on Windows without this
  
  os.environ["PATH"] += os.pathsep + os.path.dirname(os.path.realpath(__file__))
  
  
  
  from . import cv2
  
  sys.modules['cv2'] = cv2

  So I guess it is ffmpeg which is missing. Thus I installed ffmpeg like described here : http://www.wikihow.com/Install-FFmpeg-on-Windows

  Thus, ffmpeg is in my path. However, the error message still occurs. I also tried to install the ffmpeg via pip with

  pip install ffmpeg-normalize

  But this did not help either.