android - android 上 ffmpeg 命令行的问题

Question

我设法编译了 ffmpeg 静态版本。但是当我尝试调用 ffmpeg 命令行时，我得到一个 Java IOException:没有这样的文件或目录。

我的代码如下:

public void merge_video(View view){

    if(ffmpeg_file.exists()){
          Log.d(null, "ffmpeg exists");
      }else{
          Log.d(null, "Could not locate ffmpeg in the folder");
      }

      File file1 = new File("/mnt/sdcard/com.ffmpeg_test/VID_3_25_2013_12_22.mp4");
      if(file1.exists()){
          Log.d(null,"File 1 exists");
      }
      File file2 = new File("/mnt/sdcard/com.ffmpeg_test/VID_3_25_2013_12_28.mp4");
      if(file2.exists()){
          Log.d(null,"File 2 exists");
      }

      String[] ffmpegCommand = new String[5];
      ffmpegCommand[0] = "/mnt/sdcard/com.ffmpeg_test/ffmpeg";
      ffmpegCommand[1] = "-i";
      ffmpegCommand[2] = "concat:/mnt/sdcard/com.ffmpeg_test/VID_3_25_2013_12_22.mp4|/mnt/sdcard/com.ffmpeg_test/VID_3_25_2013_12_28.mp4";
      ffmpegCommand[3] = "copy";
      ffmpegCommand[4] = "/mnt/sdcard/com.ffmpeg_test/output.mp4";  

      try {
          Process ffmpegProcess = new ProcessBuilder(ffmpegCommand).redirectErrorStream(true).start();

          String line;
          BufferedReader reader = new BufferedReader(new InputStreamReader(ffmpegProcess.getInputStream()));
          Log.d(null, "*******Starting FFMPEG");

          while((line = reader.readLine())!=null){

              Log.d(null, "***"+line+"***"); 
          }
          Log.d(null,"****ending FFMPEG****");

    } catch (IOException e) {
        e.printStackTrace();
    }
  }

LogCat打印如下:

03-27 20:41:10.522: W/System.err(24709): java.io.IOException: Error running exec(). Command: [/mnt/sdcard/com.ffmpeg_test/ffmpeg, -i, concat:/mnt/sdcard/com.ffmpeg_test/VID_3_25_2013_12_22.mp4|/mnt/sdcard/com.ffmpeg_test/VID_3_25_2013_12_28.mp4, copy, /mnt/sdcard/com.ffmpeg_test/output.mp4] Working Directory: null Environment: [ANDROID_SOCKET_zygote=13, TMPDIR=/data/local/tmp, ANDROID_BOOTLOGO=1, EXTERNAL_STORAGE=/mnt/sdcard, ANDROID_ASSETS=/system/app, PATH=/sbin:/vendor/bin:/system/sbin:/system/bin:/system/xbin, ASEC_MOUNTPOINT=/mnt/asec, LOOP_MOUNTPOINT=/mnt/obb, BOOTCLASSPATH=/system/framework/core.jar:/system/framework/bouncycastle.jar:/system/framework/ext.jar:/system/framework/framework.jar:/system/framework/android.policy.jar:/system/framework/services.jar:/system/framework/core-junit.jar, USBHOST_STORAGE=/mnt/sdcard/usbStorage, ANDROID_DATA=/data, LD_LIBRARY_PATH=/vendor/lib:/system/lib, ANDROID_ROOT=/system, ANDROID_PROPERTY_WORKSPACE=12,32768, EXTERNAL_STORAGE2=/mnt/sdcard/external_sd]
03-27 20:41:10.522: W/System.err(24709):    at java.lang.ProcessManager.exec(ProcessManager.java:224)
03-27 20:41:10.522: W/System.err(24709):    at java.lang.ProcessBuilder.start(ProcessBuilder.java:202)
03-27 20:41:10.522: W/System.err(24709):    at com.example.ffmpeg_test.MainActivity.merge_video(MainActivity.java:106)
03-27 20:41:10.522: W/System.err(24709):    at java.lang.reflect.Method.invokeNative(Native Method)
03-27 20:41:10.522: W/System.err(24709):    at java.lang.reflect.Method.invoke(Method.java:507)
03-27 20:41:10.527: W/System.err(24709):    at android.view.View$1.onClick(View.java:2149)
03-27 20:41:10.527: W/System.err(24709):    at android.view.View.performClick(View.java:2538)
03-27 20:41:10.527: W/System.err(24709):    at android.view.View$PerformClick.run(View.java:9152)
03-27 20:41:10.527: W/System.err(24709):    at android.os.Handler.handleCallback(Handler.java:587)
03-27 20:41:10.527: W/System.err(24709):    at android.os.Handler.dispatchMessage(Handler.java:92)
03-27 20:41:10.527: W/System.err(24709):    at android.os.Looper.loop(Looper.java:123)
03-27 20:41:10.527: W/System.err(24709):    at android.app.ActivityThread.main(ActivityThread.java:3691)
03-27 20:41:10.527: W/System.err(24709):    at java.lang.reflect.Method.invokeNative(Native Method)
03-27 20:41:10.527: W/System.err(24709):    at java.lang.reflect.Method.invoke(Method.java:507)
03-27 20:41:10.532: W/System.err(24709):    at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:847)
03-27 20:41:10.532: W/System.err(24709):    at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:605)
03-27 20:41:10.537: W/System.err(24709):    at dalvik.system.NativeStart.main(Native Method)
03-27 20:41:10.537: W/System.err(24709): Caused by: java.io.IOException: No such file or directory
03-27 20:41:10.537: W/System.err(24709):    at java.lang.ProcessManager.exec(Native Method)
03-27 20:41:10.537: W/System.err(24709):    at java.lang.ProcessManager.exec(ProcessManager.java:222)
03-27 20:41:10.537: W/System.err(24709):    ... 16 more
03-27 20:41:36.057: W/KeyCharacterMap(24709): No keyboard for id 0
03-27 20:41:36.057: W/KeyCharacterMap(24709): Using default keymap: /system/usr/keychars/qwerty.kcm.bin

Answer 1

Android 有一个特殊的安全功能:/mnt/sdcard 文件系统是执行保护的。您不能运行位于外部存储(也称为 USB 存储)上的可执行文件。如果你想在你的设备上运行 ffmpeg 二进制文件，你必须将它加载到一个内部目录中。例如，你可以将它打包到你的Java项目的libs/armeabi中，这样安装程序会自动将它解压到/data/data//lib 设备上的目录。或者您可以找到另一个目录，例如 /data/local，您可以将可执行二进制文件放入 adb push