private static void initNativeOnce() {
        synchronized (IjkMediaPlayer.class) {
            if (!mIsNativeInitialized) {
                native_init();
                mIsNativeInitialized = true;
            }
        }
    }
Default library loader
Load them by yourself, if your libraries are not installed at default place.
IjkPlayerDemo/ijkplayer/src/main/java/tv/danmaku/ijk/media/player/IjkMediaPlayer.java