why Fatal Exception ??

[Ngmong]

02-07 23:32:41.138 23967-23967/pl.pachciarek.ffmpeg_android_example E/AndroidRuntime: FATAL EXCEPTION: main
Process: pl.pachciarek.ffmpeg_android_example, PID: 23967
java.lang.UnsatisfiedLinkError: dalvik.system.PathClassLoader[DexPathList[[zip file "/data/app/pl.pachciarek.ffmpeg_android_example-1/base.apk"],nativeLibraryDirectories=[/data/app/pl.pachciarek.ffmpeg_android_example-1/lib/arm, /vendor/lib, /system/lib]]] couldn't find "libffmpeg-test.so"
at java.lang.Runtime.loadLibrary(Runtime.java:367)
at java.lang.System.loadLibrary(System.java:1076)
at pl.pachciarek.ffmpeg_android_example.FFmpegTest.(FFmpegTest.java:33)
at pl.pachciarek.ffmpeg_android_example.MainActivity$1.onClick(MainActivity.java:31)
at android.view.View.performClick(View.java:5697)
at android.widget.TextView.performClick(TextView.java:10826)
at android.view.View$PerformClick.run(View.java:22526)
at android.os.Handler.handleCallback(Handler.java:739)
at android.os.Handler.dispatchMessage(Handler.java:95)
at android.os.Looper.loop(Looper.java:158)
at android.app.ActivityThread.main(ActivityThread.java:7224)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1230)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1120)

[Ngmong]

I did so in the following order.

1. Make sure paths to SDK and NDK in local.properties are valid,
2. Make sure paths to pre-builded ffmpeg in Android.mk are valid,
3. Push test.mp4 to your phone internal storage root folder,
4. Build and run app.
   However, after executing the startrendering, the fatal error happened.
   after executing the startrendering, the fatal error happened.