我正在尝试在 Android 应用程序中使用 FFmpeg 3.1.3。 'libavcodec-57.so' 在主 Activity 中加载,如下所示:
static {
LogUtil.e("DEVICE ARCH", System.getProperty("os.arch"));
System.loadLibrary("avutil-55");
System.loadLibrary("avcodec-57");
}
logcat 给我:(时间不重要)
E/DEVICE ARCH: armv7l
D/dalvikvm: Trying to load lib /data/app-lib/<package_name>-1/libavutil-55.so 0x4d11fe10
D/houdini: [5955] Loading library(version: 4.1.1a_y.45536 RELEASE)... successfully.
D/dalvikvm: Added shared lib /data/app-lib/<package_name>-1/libavutil-55.so 0x4d11fe10
D/dalvikvm: No JNI_OnLoad found in /data/app-lib/<package_name>-1/libavutil-55.so 0x4d11fe10, skipping init
D/dalvikvm: Trying to load lib /data/app-lib/<package_name>-1/libavcodec-57.so 0x4d11fe10
D/houdini: [5955] Unsupported feature (ID:0x10600ccf).
D/houdini: [5955] Open Native Library /data/app-lib/<package_name>-1/libavcodec-57.so failed.
E/dalvikvm: Houdini dlopen("/data/app-lib/<package_name>-1/libavcodec-57.so") failed: Cannot load ARM library
W/dalvikvm: Exception Ljava/lang/UnsatisfiedLinkError; thrown while initializing Lapp/Activity/MainActivity;
W/dalvikvm: Class init failed in newInstance call (Lapp/Activity/MainActivity;)
D/AndroidRuntime: Shutting down VM
W/dalvikvm: threadid=1: thread exiting with uncaught exception (group=0x4c810160)
W/TDLog: UncaughtException in Thread main
java.lang.UnsatisfiedLinkError: dlopen failed: "/data/app-lib/<package_name>-1/libavcodec-57.so" has unexpected e_machine: 40
at java.lang.Runtime.loadLibrary(Runtime.java:364)
at java.lang.System.loadLibrary(System.java:526)
at <package_name>.Activity.MainActivity.<clinit>(MainActivity.java:128)
at java.lang.Class.newInstanceImpl(Native Method)
at java.lang.Class.newInstance(Class.java:1208)
at android.app.Instrumentation.newActivity(Instrumentation.java:1061)
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2141)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2273)
at android.app.ActivityThread.access$800(ActivityThread.java:138)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1236)
at android.os.Handler.dispatchMessage(Handler.java:102)
at android.os.Looper.loop(Looper.java:149)
at android.app.ActivityThread.main(ActivityThread.java:5045)
at java.lang.reflect.Method.invokeNative(Native Method)
at java.lang.reflect.Method.invoke(Method.java:515)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:794)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:610)
at dalvik.system.NativeStart.main(Native Method)
它表示设备的架构是 ARM。 libavcodec-57.so
加载失败,e_machine: 40
表明预期架构也是 ARM(请参阅 ELF header doc)。
此外,libavutil-55.so
和 libavcodec-57.so
都位于同一目录中。
最佳答案
解决方案是通过 libavcodec-57.so
加载所有需要的库在加载之前。
执行readelf -d libavcodec-57.so | grep NEEDED
将获得它需要的库:
0x00000001 (NEEDED) Shared library: [libswresample-2.so]
0x00000001 (NEEDED) Shared library: [libavutil-55.so]
0x00000001 (NEEDED) Shared library: [libx264-148.so]
0x00000001 (NEEDED) Shared library: [libfaac.so]
0x00000001 (NEEDED) Shared library: [libm.so]
0x00000001 (NEEDED) Shared library: [libz.so]
0x00000001 (NEEDED) Shared library: [libc.so]
内置库除外libm
, libz
和 libc
,所有需要的库都应该加载之前 libavcodec-57.so
.所以 Java 代码变成这样:
static {
System.loadLibrary("faac");
System.loadLibrary("x264-148");
System.loadLibrary("avutil-55");
System.loadLibrary("swresample-2"); // need x264 and avutil
System.loadLibrary("avcodec-57"); // need all of the above
}
关于android - java.lang.UnsatisfiedLinkError : dlopen failed: libavcodec-57. 所以有意外的 e_machine:40,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/39764705/