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• undefined reference to ffmpeg functions in native code using Android Studio 2.2

  12 octobre 2016, par Krzysztof Kansy

  I have a problem with using ffmpeg in Android Studio 2.2 using NDK 13 and new Cmake building system. FFmpeg version is 3.1.4.
  The system I’m working on is Linux Mint 18 64-bit.
  At the build time I’m getting undefined reference error each time I use ffpeg functions.

  My MainActivity.java :

  public class MainActivity extends AppCompatActivity {
  
  
  
      @Override
  
      protected void onCreate(Bundle savedInstanceState) {
  
          super.onCreate(savedInstanceState);
  
          setContentView(R.layout.activity_main);
  
  
  
      // Example of a call to a native method
  
      TextView tv = (TextView) findViewById(R.id.sample_text);
  
      tv.setText(stringFromJNI());
  
      }
  
  
  
      /**
  
       * A native method that is implemented by the 'native-lib' native library,
  
       * which is packaged with this application.
  
       */
  
      public native String stringFromJNI();
  
  
  
      // Used to load the 'native-lib' library on application startup.
  
      static {
  
          System.loadLibrary("native-lib");
  
      }
  
  }

  My native class (undefined reference is pointing to av_init_packet(&avPacket)) :

  #include 
  
  #include <string>
  
  #include <android></android>log.h>
  
  #include <libavcodec></libavcodec>avcodec.h>
  
  
  
  
  
  extern "C"
  
  jstring
  
  Java_com_example_tito_jnitest_MainActivity_stringFromJNI(
  
          JNIEnv* env,
  
          jobject /* this */) {
  
  
  
      std::string hello = "Hello from C++";
  
  
  
      __android_log_print(ANDROID_LOG_INFO, "JNItest", "Hello from JNI!");
  
  
  
      AVPacket avPacket;
  
      av_init_packet(&amp;avPacket);
  
  
  
      return env->NewStringUTF(hello.c_str());
  
  }
  
  </string>

  build.gradle script

  apply plugin: 'com.android.application'
  
  
  
  android {
  
      compileSdkVersion 24
  
      buildToolsVersion "24.0.3"
  
      defaultConfig {
  
          applicationId "com.example.tito.jnitest"
  
          minSdkVersion 19
  
          targetSdkVersion 24
  
          versionCode 1
  
          versionName "1.0"
  
          testInstrumentationRunner "android.support.test.runner.AndroidJUnitRunner"
  
          externalNativeBuild {
  
              cmake {
  
                  // Passes optional arguments to CMake.
  
                  cppFlags "-frtti -fexceptions"
  
                  abiFilters 'armeabi'
  
              }
  
          }
  
      }
  
  
  
      sourceSets {
  
          main {
  
              jniLibs.srcDirs = ['/home/tito/AndroidStudioProjects/JNItest/app/src/main/jniLibs']
  
          }
  
      }
  
  
  
      buildTypes {
  
          release {
  
              minifyEnabled false
  
              proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
  
          }
  
      }
  
      externalNativeBuild {
  
          cmake {
  
              path "CMakeLists.txt"
  
          }
  
      }
  
  }
  
  
  
  dependencies {
  
      compile fileTree(dir: 'libs', include: ['*.jar'])
  
      androidTestCompile('com.android.support.test.espresso:espresso-core:2.2.2', {
  
          exclude group: 'com.android.support', module: 'support-annotations'
  
      })
  
      compile 'com.android.support:appcompat-v7:24.2.1'
  
      testCompile 'junit:junit:4.12'
  
  }

  CMakeLists.txt

  cmake_minimum_required(VERSION 3.4.1)
  
  
  
  include_directories(/home/tito/Android/Sdk/ndk-bundle/sources/ffmpeg-3.1.4/android/${ANDROID_ABI}/include)
  
  
  
  #set(CMAKE_VERBOSE_MAKEFILE on)
  
  #set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -std=gnu++11")
  
  
  
  add_library( avutil
  
               SHARED
  
               IMPORTED )
  
  
  
  set_target_properties(
  
                  avutil
  
                  PROPERTIES IMPORTED_LOCATION
  
                  /home/tito/AndroidStudioProjects/JNItest/app/src/main/jniLibs/${ANDROID_ABI}/libavutil-55.so )
  
  
  
  add_library( swscale
  
               SHARED
  
               IMPORTED )
  
  
  
  set_target_properties(
  
                  swscale
  
                  PROPERTIES IMPORTED_LOCATION
  
                  /home/tito/AndroidStudioProjects/JNItest/app/src/main/jniLibs/${ANDROID_ABI}/libswscale-4.so )
  
  
  
  add_library( swresample
  
               SHARED
  
               IMPORTED )
  
  
  
  set_target_properties(
  
                  swresample
  
                  PROPERTIES IMPORTED_LOCATION
  
                  /home/tito/AndroidStudioProjects/JNItest/app/src/main/jniLibs/${ANDROID_ABI}/libswresample-2.so )
  
  
  
  add_library( avcodec
  
               SHARED
  
               IMPORTED )
  
  
  
  set_target_properties(
  
                  avcodec
  
                  PROPERTIES IMPORTED_LOCATION
  
                  /home/tito/AndroidStudioProjects/JNItest/app/src/main/jniLibs/${ANDROID_ABI}/libavcodec-57.so )
  
  
  
  add_library( avfilter
  
               SHARED
  
               IMPORTED )
  
  
  
  set_target_properties(
  
                  avfilter
  
                  PROPERTIES IMPORTED_LOCATION
  
                  /home/tito/AndroidStudioProjects/JNItest/app/src/main/jniLibs/${ANDROID_ABI}/libavfilter-6.so )
  
  
  
  add_library( avformat
  
               SHARED
  
               IMPORTED )
  
  
  
  set_target_properties(
  
                  avformat
  
                  PROPERTIES IMPORTED_LOCATION
  
                  /home/tito/AndroidStudioProjects/JNItest/app/src/main/jniLibs/${ANDROID_ABI}/libavformat-57.so )
  
  
  
  add_library( avdevice
  
               SHARED
  
               IMPORTED )
  
  
  
  set_target_properties(
  
                  avdevice
  
                  PROPERTIES IMPORTED_LOCATION
  
                  /home/tito/AndroidStudioProjects/JNItest/app/src/main/jniLibs/${ANDROID_ABI}/libavdevice-57.so )
  
  
  
  add_library( native-lib
  
               SHARED
  
               src/main/cpp/native-lib.cpp )
  
  
  
  find_library( log-lib
  
                log )
  
  
  
  target_link_libraries(native-lib ${log-lib} avutil swscale swresample avcodec avfilter avformat avdevice)

  Build process of ffmpeg seemed to be successful. Here’s my build script :

  #!/bin/bash
  
  NDK=/home/tito/Android/Sdk/ndk-bundle
  
  SYSROOT=$NDK/platforms/android-19/arch-arm/
  
  TOOLCHAIN=$NDK/toolchains/arm-linux-androideabi-4.9/prebuilt/linux-x86_64
  
  function build_one
  
  {
  
  ./configure \
  
  --prefix=$PREFIX \
  
  --disable-static \
  
  --enable-shared \
  
  --disable-doc \
  
  --disable-ffmpeg \
  
  --disable-ffplay \
  
  --disable-ffprobe \
  
  --disable-ffserver \
  
  --disable-doc \
  
  --cross-prefix=$TOOLCHAIN/bin/arm-linux-androideabi- \
  
  --target-os=linux \
  
  --arch=arm \
  
  --enable-cross-compile \
  
  --sysroot=$SYSROOT \
  
  --extra-cflags="-Os -fpic -marm" \
  
  --extra-ldflags="-marm" \
  
  $ADDITIONAL_CONFIGURE_FLAG
  
  make clean
  
  make
  
  make install
  
  }
  
  CPU=armeabi
  
  PREFIX=$(pwd)/android/$CPU
  
  build_one

  One thing I noticed that could indicate that something is wrong with ffmpeg build is warning WARNING: /home/tito/Android/Sdk/ndk-bundle/toolchains/arm-linux-androideabi-4.9/prebuilt/linux-x86_64/bin/arm-linux-androideabi-pkg-config not found, library detection may fail. during building. I’m not sure if this may be cause of problems.
  

  I was trying to build for all of the ABIs, but for now I decided to focus on making just armeabi working. I’m having exact same failure after using e.g. arm64-v8a.

  Finally, here is the gradle console’s content with error :

  Executing tasks: [:app:assembleDebug]
  
  
  
  Configuration on demand is an incubating feature.
  
  Incremental java compilation is an incubating feature.
  
  :app:preBuild UP-TO-DATE
  
  :app:preDebugBuild UP-TO-DATE
  
  :app:checkDebugManifest
  
  :app:preReleaseBuild UP-TO-DATE
  
  :app:prepareComAndroidSupportAnimatedVectorDrawable2421Library UP-TO-DATE
  
  :app:prepareComAndroidSupportAppcompatV72421Library UP-TO-DATE
  
  :app:prepareComAndroidSupportSupportCompat2421Library UP-TO-DATE
  
  :app:prepareComAndroidSupportSupportCoreUi2421Library UP-TO-DATE
  
  :app:prepareComAndroidSupportSupportCoreUtils2421Library UP-TO-DATE
  
  :app:prepareComAndroidSupportSupportFragment2421Library UP-TO-DATE
  
  :app:prepareComAndroidSupportSupportMediaCompat2421Library UP-TO-DATE
  
  :app:prepareComAndroidSupportSupportV42421Library UP-TO-DATE
  
  :app:prepareComAndroidSupportSupportVectorDrawable2421Library UP-TO-DATE
  
  :app:prepareDebugDependencies
  
  :app:compileDebugAidl UP-TO-DATE
  
  :app:compileDebugRenderscript UP-TO-DATE
  
  :app:generateDebugBuildConfig UP-TO-DATE
  
  :app:generateDebugResValues UP-TO-DATE
  
  :app:generateDebugResources UP-TO-DATE
  
  :app:mergeDebugResources UP-TO-DATE
  
  :app:processDebugManifest UP-TO-DATE
  
  :app:processDebugResources
  
  :app:generateDebugSources
  
  :app:incrementalDebugJavaCompilationSafeguard UP-TO-DATE
  
  :app:compileDebugJavaWithJavac UP-TO-DATE
  
  :app:generateJsonModelDebug UP-TO-DATE
  
  :app:externalNativeBuildDebug
  
    building /home/tito/AndroidStudioProjects/JNItest/app/build/intermediates/cmake/debug/obj/armeabi/libnative-lib.so
  
  :app:externalNativeBuildDebug FAILED
  
  
  
  FAILURE: Build failed with an exception.
  
  
  
  * What went wrong:
  
  Execution failed for task ':app:externalNativeBuildDebug'.
  
  > Build command failed.
  
    Error while executing '/home/tito/Android/Sdk/cmake/3.6.3155560/bin/cmake' with arguments {--build /home/tito/AndroidStudioProjects/JNItest/app/.externalNativeBuild/cmake/debug/armeabi --target native-lib}
  
    [1/2] Building CXX object CMakeFiles/native-lib.dir/src/main/cpp/native-lib.cpp.o
  
    [2/2] Linking CXX shared library ../../../../build/intermediates/cmake/debug/obj/armeabi/libnative-lib.so
  
    FAILED: : && /home/tito/Android/Sdk/ndk-bundle/toolchains/llvm/prebuilt/linux-x86_64/bin/clang++  -target armv5te-none-linux-androideabi -gcc-toolchain /home/tito/Android/Sdk/ndk-bundle/toolchains/arm-linux-androideabi-4.9/prebuilt/linux-x86_64 --sysroot=/home/tito/Android/Sdk/ndk-bundle/platforms/android-19/arch-arm -fPIC -g -DANDROID -ffunction-sections -funwind-tables -fstack-protector-strong -no-canonical-prefixes -march=armv5te -mtune=xscale -msoft-float -fno-integrated-as -mthumb -Wa,--noexecstack -Wformat -Werror=format-security -fno-exceptions -fno-rtti -g -DANDROID -ffunction-sections -funwind-tables -fstack-protector-strong -no-canonical-prefixes -march=armv5te -mtune=xscale -msoft-float -fno-integrated-as -mthumb -Wa,--noexecstack -Wformat -Werror=format-security -fno-exceptions -fno-rtti -frtti -fexceptions -O0 -fno-limit-debug-info -O0 -fno-limit-debug-info  -Wl,--build-id -Wl,--warn-shared-textrel -Wl,--fatal-warnings -Wl,--no-undefined -Wl,-z,noexecstack -Qunused-arguments -Wl,-z,relro -Wl,-z,now -Wl,--build-id -Wl,--warn-shared-textrel -Wl,--fatal-warnings -Wl,--no-undefined -Wl,-z,noexecstack -Qunused-arguments -Wl,-z,relro -Wl,-z,now -shared -Wl,-soname,libnative-lib.so -o ../../../../build/intermediates/cmake/debug/obj/armeabi/libnative-lib.so CMakeFiles/native-lib.dir/src/main/cpp/native-lib.cpp.o  /home/tito/Android/Sdk/ndk-bundle/platforms/android-19/arch-arm/usr/lib/liblog.so ../../../../src/main/jniLibs/armeabi/libavutil-55.so ../../../../src/main/jniLibs/armeabi/libswscale-4.so ../../../../src/main/jniLibs/armeabi/libswresample-2.so ../../../../src/main/jniLibs/armeabi/libavcodec-57.so ../../../../src/main/jniLibs/armeabi/libavfilter-6.so ../../../../src/main/jniLibs/armeabi/libavformat-57.so ../../../../src/main/jniLibs/armeabi/libavdevice-57.so -lm "/home/tito/Android/Sdk/ndk-bundle/sources/cxx-stl/gnu-libstdc++/4.9/libs/armeabi/libgnustl_static.a" "-latomic" && :
  
    /home/tito/AndroidStudioProjects/JNItest/app/src/main/cpp/native-lib.cpp:18: error: undefined reference to 'av_init_packet(AVPacket*)'
  
    clang++: error: linker command failed with exit code 1 (use -v to see invocation)
  
    ninja: build stopped: subcommand failed.
  
  
  
  
  
  * Try:
  
  Run with --info or --debug option to get more log output.
  
  
  
  * Exception is:
  
  org.gradle.api.tasks.TaskExecutionException: Execution failed for task ':app:externalNativeBuildDebug'.
  
      at org.gradle.api.internal.tasks.execution.ExecuteActionsTaskExecuter.executeActions(ExecuteActionsTaskExecuter.java:69)
  
      at org.gradle.api.internal.tasks.execution.ExecuteActionsTaskExecuter.execute(ExecuteActionsTaskExecuter.java:46)
  
      at org.gradle.api.internal.tasks.execution.PostExecutionAnalysisTaskExecuter.execute(PostExecutionAnalysisTaskExecuter.java:35)
  
      at org.gradle.api.internal.tasks.execution.SkipUpToDateTaskExecuter.execute(SkipUpToDateTaskExecuter.java:66)
  
      at org.gradle.api.internal.tasks.execution.ValidatingTaskExecuter.execute(ValidatingTaskExecuter.java:58)
  
      at org.gradle.api.internal.tasks.execution.SkipEmptySourceFilesTaskExecuter.execute(SkipEmptySourceFilesTaskExecuter.java:52)
  
      at org.gradle.api.internal.tasks.execution.SkipTaskWithNoActionsExecuter.execute(SkipTaskWithNoActionsExecuter.java:52)
  
      at org.gradle.api.internal.tasks.execution.SkipOnlyIfTaskExecuter.execute(SkipOnlyIfTaskExecuter.java:53)
  
      at org.gradle.api.internal.tasks.execution.ExecuteAtMostOnceTaskExecuter.execute(ExecuteAtMostOnceTaskExecuter.java:43)
  
      at org.gradle.execution.taskgraph.DefaultTaskGraphExecuter$EventFiringTaskWorker.execute(DefaultTaskGraphExecuter.java:203)
  
      at org.gradle.execution.taskgraph.DefaultTaskGraphExecuter$EventFiringTaskWorker.execute(DefaultTaskGraphExecuter.java:185)
  
      at org.gradle.execution.taskgraph.AbstractTaskPlanExecutor$TaskExecutorWorker.processTask(AbstractTaskPlanExecutor.java:66)
  
      at org.gradle.execution.taskgraph.AbstractTaskPlanExecutor$TaskExecutorWorker.run(AbstractTaskPlanExecutor.java:50)
  
      at org.gradle.execution.taskgraph.DefaultTaskPlanExecutor.process(DefaultTaskPlanExecutor.java:25)
  
      at org.gradle.execution.taskgraph.DefaultTaskGraphExecuter.execute(DefaultTaskGraphExecuter.java:110)
  
      at org.gradle.execution.SelectedTaskExecutionAction.execute(SelectedTaskExecutionAction.java:37)
  
      at org.gradle.execution.DefaultBuildExecuter.execute(DefaultBuildExecuter.java:37)
  
      at org.gradle.execution.DefaultBuildExecuter.access$000(DefaultBuildExecuter.java:23)
  
      at org.gradle.execution.DefaultBuildExecuter$1.proceed(DefaultBuildExecuter.java:43)
  
      at org.gradle.execution.DryRunBuildExecutionAction.execute(DryRunBuildExecutionAction.java:32)
  
      at org.gradle.execution.DefaultBuildExecuter.execute(DefaultBuildExecuter.java:37)
  
      at org.gradle.execution.DefaultBuildExecuter.execute(DefaultBuildExecuter.java:30)
  
      at org.gradle.initialization.DefaultGradleLauncher$4.run(DefaultGradleLauncher.java:153)
  
      at org.gradle.internal.Factories$1.create(Factories.java:22)
  
      at org.gradle.internal.progress.DefaultBuildOperationExecutor.run(DefaultBuildOperationExecutor.java:91)
  
      at org.gradle.internal.progress.DefaultBuildOperationExecutor.run(DefaultBuildOperationExecutor.java:53)
  
      at org.gradle.initialization.DefaultGradleLauncher.doBuildStages(DefaultGradleLauncher.java:150)
  
      at org.gradle.initialization.DefaultGradleLauncher.access$200(DefaultGradleLauncher.java:32)
  
      at org.gradle.initialization.DefaultGradleLauncher$1.create(DefaultGradleLauncher.java:98)
  
      at org.gradle.initialization.DefaultGradleLauncher$1.create(DefaultGradleLauncher.java:92)
  
      at org.gradle.internal.progress.DefaultBuildOperationExecutor.run(DefaultBuildOperationExecutor.java:91)
  
      at org.gradle.internal.progress.DefaultBuildOperationExecutor.run(DefaultBuildOperationExecutor.java:63)
  
      at org.gradle.initialization.DefaultGradleLauncher.doBuild(DefaultGradleLauncher.java:92)
  
      at org.gradle.initialization.DefaultGradleLauncher.run(DefaultGradleLauncher.java:83)
  
      at org.gradle.launcher.exec.InProcessBuildActionExecuter$DefaultBuildController.run(InProcessBuildActionExecuter.java:99)
  
      at org.gradle.tooling.internal.provider.runner.BuildModelActionRunner.run(BuildModelActionRunner.java:46)
  
      at org.gradle.launcher.exec.ChainingBuildActionRunner.run(ChainingBuildActionRunner.java:35)
  
      at org.gradle.tooling.internal.provider.runner.SubscribableBuildActionRunner.run(SubscribableBuildActionRunner.java:58)
  
      at org.gradle.launcher.exec.ChainingBuildActionRunner.run(ChainingBuildActionRunner.java:35)
  
      at org.gradle.launcher.exec.InProcessBuildActionExecuter.execute(InProcessBuildActionExecuter.java:48)
  
      at org.gradle.launcher.exec.InProcessBuildActionExecuter.execute(InProcessBuildActionExecuter.java:30)
  
      at org.gradle.launcher.exec.ContinuousBuildActionExecuter.execute(ContinuousBuildActionExecuter.java:81)
  
      at org.gradle.launcher.exec.ContinuousBuildActionExecuter.execute(ContinuousBuildActionExecuter.java:46)
  
      at org.gradle.launcher.daemon.server.exec.ExecuteBuild.doBuild(ExecuteBuild.java:52)
  
      at org.gradle.launcher.daemon.server.exec.BuildCommandOnly.execute(BuildCommandOnly.java:36)
  
      at org.gradle.launcher.daemon.server.api.DaemonCommandExecution.proceed(DaemonCommandExecution.java:120)
  
      at org.gradle.launcher.daemon.server.exec.WatchForDisconnection.execute(WatchForDisconnection.java:37)
  
      at org.gradle.launcher.daemon.server.api.DaemonCommandExecution.proceed(DaemonCommandExecution.java:120)
  
      at org.gradle.launcher.daemon.server.exec.ResetDeprecationLogger.execute(ResetDeprecationLogger.java:26)
  
      at org.gradle.launcher.daemon.server.api.DaemonCommandExecution.proceed(DaemonCommandExecution.java:120)
  
      at org.gradle.launcher.daemon.server.exec.RequestStopIfSingleUsedDaemon.execute(RequestStopIfSingleUsedDaemon.java:34)
  
      at org.gradle.launcher.daemon.server.api.DaemonCommandExecution.proceed(DaemonCommandExecution.java:120)
  
      at org.gradle.launcher.daemon.server.exec.ForwardClientInput$2.call(ForwardClientInput.java:74)
  
      at org.gradle.launcher.daemon.server.exec.ForwardClientInput$2.call(ForwardClientInput.java:72)
  
      at org.gradle.util.Swapper.swap(Swapper.java:38)
  
      at org.gradle.launcher.daemon.server.exec.ForwardClientInput.execute(ForwardClientInput.java:72)
  
      at org.gradle.launcher.daemon.server.api.DaemonCommandExecution.proceed(DaemonCommandExecution.java:120)
  
      at org.gradle.launcher.daemon.server.health.DaemonHealthTracker.execute(DaemonHealthTracker.java:47)
  
      at org.gradle.launcher.daemon.server.api.DaemonCommandExecution.proceed(DaemonCommandExecution.java:120)
  
      at org.gradle.launcher.daemon.server.exec.LogToClient.doBuild(LogToClient.java:60)
  
      at org.gradle.launcher.daemon.server.exec.BuildCommandOnly.execute(BuildCommandOnly.java:36)
  
      at org.gradle.launcher.daemon.server.api.DaemonCommandExecution.proceed(DaemonCommandExecution.java:120)
  
      at org.gradle.launcher.daemon.server.exec.EstablishBuildEnvironment.doBuild(EstablishBuildEnvironment.java:72)
  
      at org.gradle.launcher.daemon.server.exec.BuildCommandOnly.execute(BuildCommandOnly.java:36)
  
      at org.gradle.launcher.daemon.server.api.DaemonCommandExecution.proceed(DaemonCommandExecution.java:120)
  
      at org.gradle.launcher.daemon.server.health.HintGCAfterBuild.execute(HintGCAfterBuild.java:41)
  
      at org.gradle.launcher.daemon.server.api.DaemonCommandExecution.proceed(DaemonCommandExecution.java:120)
  
      at org.gradle.launcher.daemon.server.exec.StartBuildOrRespondWithBusy$1.run(StartBuildOrRespondWithBusy.java:50)
  
      at org.gradle.launcher.daemon.server.DaemonStateCoordinator$1.run(DaemonStateCoordinator.java:237)
  
      at org.gradle.internal.concurrent.ExecutorPolicy$CatchAndRecordFailures.onExecute(ExecutorPolicy.java:54)
  
      at org.gradle.internal.concurrent.StoppableExecutorImpl$1.run(StoppableExecutorImpl.java:40)
  
  Caused by: org.gradle.internal.UncheckedException: Build command failed.
  
  Error while executing '/home/tito/Android/Sdk/cmake/3.6.3155560/bin/cmake' with arguments {--build /home/tito/AndroidStudioProjects/JNItest/app/.externalNativeBuild/cmake/debug/armeabi --target native-lib}
  
  [1/2] Building CXX object CMakeFiles/native-lib.dir/src/main/cpp/native-lib.cpp.o
  
  [2/2] Linking CXX shared library ../../../../build/intermediates/cmake/debug/obj/armeabi/libnative-lib.so
  
  FAILED: : && /home/tito/Android/Sdk/ndk-bundle/toolchains/llvm/prebuilt/linux-x86_64/bin/clang++  -target armv5te-none-linux-androideabi -gcc-toolchain /home/tito/Android/Sdk/ndk-bundle/toolchains/arm-linux-androideabi-4.9/prebuilt/linux-x86_64 --sysroot=/home/tito/Android/Sdk/ndk-bundle/platforms/android-19/arch-arm -fPIC -g -DANDROID -ffunction-sections -funwind-tables -fstack-protector-strong -no-canonical-prefixes -march=armv5te -mtune=xscale -msoft-float -fno-integrated-as -mthumb -Wa,--noexecstack -Wformat -Werror=format-security -fno-exceptions -fno-rtti -g -DANDROID -ffunction-sections -funwind-tables -fstack-protector-strong -no-canonical-prefixes -march=armv5te -mtune=xscale -msoft-float -fno-integrated-as -mthumb -Wa,--noexecstack -Wformat -Werror=format-security -fno-exceptions -fno-rtti -frtti -fexceptions -O0 -fno-limit-debug-info -O0 -fno-limit-debug-info  -Wl,--build-id -Wl,--warn-shared-textrel -Wl,--fatal-warnings -Wl,--no-undefined -Wl,-z,noexecstack -Qunused-arguments -Wl,-z,relro -Wl,-z,now -Wl,--build-id -Wl,--warn-shared-textrel -Wl,--fatal-warnings -Wl,--no-undefined -Wl,-z,noexecstack -Qunused-arguments -Wl,-z,relro -Wl,-z,now -shared -Wl,-soname,libnative-lib.so -o ../../../../build/intermediates/cmake/debug/obj/armeabi/libnative-lib.so CMakeFiles/native-lib.dir/src/main/cpp/native-lib.cpp.o  /home/tito/Android/Sdk/ndk-bundle/platforms/android-19/arch-arm/usr/lib/liblog.so ../../../../src/main/jniLibs/armeabi/libavutil-55.so ../../../../src/main/jniLibs/armeabi/libswscale-4.so ../../../../src/main/jniLibs/armeabi/libswresample-2.so ../../../../src/main/jniLibs/armeabi/libavcodec-57.so ../../../../src/main/jniLibs/armeabi/libavfilter-6.so ../../../../src/main/jniLibs/armeabi/libavformat-57.so ../../../../src/main/jniLibs/armeabi/libavdevice-57.so -lm "/home/tito/Android/Sdk/ndk-bundle/sources/cxx-stl/gnu-libstdc++/4.9/libs/armeabi/libgnustl_static.a" "-latomic" && :
  
  /home/tito/AndroidStudioProjects/JNItest/app/src/main/cpp/native-lib.cpp:18: error: undefined reference to 'av_init_packet(AVPacket*)'
  
  clang++: error: linker command failed with exit code 1 (use -v to see invocation)
  
  ninja: build stopped: subcommand failed.
  
  
  
      at org.gradle.internal.UncheckedException.throwAsUncheckedException(UncheckedException.java:45)
  
      at org.gradle.internal.reflect.JavaMethod.invoke(JavaMethod.java:78)
  
      at org.gradle.api.internal.project.taskfactory.AnnotationProcessingTaskFactory$StandardTaskAction.doExecute(AnnotationProcessingTaskFactory.java:228)
  
      at org.gradle.api.internal.project.taskfactory.AnnotationProcessingTaskFactory$StandardTaskAction.execute(AnnotationProcessingTaskFactory.java:221)
  
      at org.gradle.api.internal.project.taskfactory.AnnotationProcessingTaskFactory$StandardTaskAction.execute(AnnotationProcessingTaskFactory.java:210)
  
      at org.gradle.api.internal.AbstractTask$TaskActionWrapper.execute(AbstractTask.java:621)
  
      at org.gradle.api.internal.AbstractTask$TaskActionWrapper.execute(AbstractTask.java:604)
  
      at org.gradle.api.internal.tasks.execution.ExecuteActionsTaskExecuter.executeAction(ExecuteActionsTaskExecuter.java:80)
  
      at org.gradle.api.internal.tasks.execution.ExecuteActionsTaskExecuter.executeActions(ExecuteActionsTaskExecuter.java:61)
  
      ... 70 more
  
  Caused by: Build command failed.
  
  Error while executing '/home/tito/Android/Sdk/cmake/3.6.3155560/bin/cmake' with arguments {--build /home/tito/AndroidStudioProjects/JNItest/app/.externalNativeBuild/cmake/debug/armeabi --target native-lib}
  
  [1/2] Building CXX object CMakeFiles/native-lib.dir/src/main/cpp/native-lib.cpp.o
  
  [2/2] Linking CXX shared library ../../../../build/intermediates/cmake/debug/obj/armeabi/libnative-lib.so
  
  FAILED: : && /home/tito/Android/Sdk/ndk-bundle/toolchains/llvm/prebuilt/linux-x86_64/bin/clang++  -target armv5te-none-linux-androideabi -gcc-toolchain /home/tito/Android/Sdk/ndk-bundle/toolchains/arm-linux-androideabi-4.9/prebuilt/linux-x86_64 --sysroot=/home/tito/Android/Sdk/ndk-bundle/platforms/android-19/arch-arm -fPIC -g -DANDROID -ffunction-sections -funwind-tables -fstack-protector-strong -no-canonical-prefixes -march=armv5te -mtune=xscale -msoft-float -fno-integrated-as -mthumb -Wa,--noexecstack -Wformat -Werror=format-security -fno-exceptions -fno-rtti -g -DANDROID -ffunction-sections -funwind-tables -fstack-protector-strong -no-canonical-prefixes -march=armv5te -mtune=xscale -msoft-float -fno-integrated-as -mthumb -Wa,--noexecstack -Wformat -Werror=format-security -fno-exceptions -fno-rtti -frtti -fexceptions -O0 -fno-limit-debug-info -O0 -fno-limit-debug-info  -Wl,--build-id -Wl,--warn-shared-textrel -Wl,--fatal-warnings -Wl,--no-undefined -Wl,-z,noexecstack -Qunused-arguments -Wl,-z,relro -Wl,-z,now -Wl,--build-id -Wl,--warn-shared-textrel -Wl,--fatal-warnings -Wl,--no-undefined -Wl,-z,noexecstack -Qunused-arguments -Wl,-z,relro -Wl,-z,now -shared -Wl,-soname,libnative-lib.so -o ../../../../build/intermediates/cmake/debug/obj/armeabi/libnative-lib.so CMakeFiles/native-lib.dir/src/main/cpp/native-lib.cpp.o  /home/tito/Android/Sdk/ndk-bundle/platforms/android-19/arch-arm/usr/lib/liblog.so ../../../../src/main/jniLibs/armeabi/libavutil-55.so ../../../../src/main/jniLibs/armeabi/libswscale-4.so ../../../../src/main/jniLibs/armeabi/libswresample-2.so ../../../../src/main/jniLibs/armeabi/libavcodec-57.so ../../../../src/main/jniLibs/armeabi/libavfilter-6.so ../../../../src/main/jniLibs/armeabi/libavformat-57.so ../../../../src/main/jniLibs/armeabi/libavdevice-57.so -lm "/home/tito/Android/Sdk/ndk-bundle/sources/cxx-stl/gnu-libstdc++/4.9/libs/armeabi/libgnustl_static.a" "-latomic" && :
  
  /home/tito/AndroidStudioProjects/JNItest/app/src/main/cpp/native-lib.cpp:18: error: undefined reference to 'av_init_packet(AVPacket*)'
  
  clang++: error: linker command failed with exit code 1 (use -v to see invocation)
  
  ninja: build stopped: subcommand failed.
  
  
  
      at com.android.build.gradle.tasks.ExternalNativeBuildTaskUtils.executeBuildProcessAndLogError(ExternalNativeBuildTaskUtils.java:233)
  
      at com.android.build.gradle.tasks.ExternalNativeBuildTask.executeProcessBatch(ExternalNativeBuildTask.java:231)
  
      at com.android.build.gradle.tasks.ExternalNativeBuildTask.build(ExternalNativeBuildTask.java:163)
  
      at org.gradle.internal.reflect.JavaMethod.invoke(JavaMethod.java:75)
  
      ... 77 more
  
  
  
  
  
  BUILD FAILED
  
  
  
  Total time: 0.723 secs

  Can anyone tell me what I’m doing wrong here ?

• How to configure proc_open "pipes" for ffmpeg stdin/stderr on Windows ?

  10 septembre 2018, par GDP

  Firstly, I’ve spent the week googling and trying variations of dozens and dozens of answers for Unix, but it’s been a complete bust, I need an answer for Windows, so this is not a duplicate question of the Unix equivalents.

  We’re trying to create a scheduled task that will process a queue of tasks in PHP, and maintain an array of up to 10 ffmpeg instances at a time. I’ve tried exec, shell_exec and proc_open , coupled with/without start /B without any "complete" luck.
  I’m also quite certain that it has to do with setting up the descriptorspec and pipes (which I’m completely unfamiliar with), and here’s why :

  Per https://trac.ffmpeg.org/wiki/PHP,

  The part that says ">/dev/null" will redirect the standard OUTPUT
  (stdout) of the ffmpeg instance to /dev/null (effectively ignoring the
  output) and "2>/dev/null" will redirect the standard ERROR (stderr) to
  /dev/null (effectively ignoring any error log messages). These two can
  be combined into a shorter representation : ">/dev/null 2>&1". If you
  like, you can ?read more about I/O Redirection.

  An important note should be mentioned here. The ffmpeg command-line
  tool uses stderr for output of error log messages and stdout is
  reserved for possible use of pipes (to redirect the output media
  stream generated from ffmpeg to some other command line tool). That
  being said, if you run your ffmpeg in the background, you’ll most
  probably want to redirect the stderr to a log file, to be able to
  check it later.

  One more thing to take care about is the standard INPUT (stdin).
  Command-line ffmpeg tool is designed as an interactive utility that
  accepts user’s input (usually from keyboard) and reports the error log
  on the user’s current screen/terminal. When we run ffmpeg in the
  background, we want to tell ffmpeg that no input should be accepted
  (nor waited for) from the stdin. We can tell this to ffmpeg, using I/O
  redirection again "

  echo "Starting ffmpeg...\n\n";
  
  echo shell_exec("ffmpeg -y -i input.avi output.avi null >/dev/null 2>/var/log/ffmpeg.log &");
  
  echo "Done.\n";

  This example actually uses shell_exec, though we want to use proc_open so that we can use a loop to check if the process has completed or not.

  Here’s a basic sample loop of what I’ve tried. The problem in executing this is that the actual ffmpeg processing completes, but the process is hung "waiting for something". When I use debugging, and step out of the loop and terminate the process after a few minutes, the ffmpeg output is written and the script carries on. (From the command line, ffmpeg takes less than a minute to complete)

  $descriptorspec = array(
  
      array('pipe', 'r'),
  
      array('pipe', 'w'),
  
      array('pipe', 'w'),
  
  );
  
  $pipes = null;
  
  $cwd = null;
  
  $env = null;
  
  $process = proc_open('start /B ffmpeg.exe -i input.mov output.mp4 -nostdin', $descriptorspec, $pipes, $cwd, $env);
  
  $status = proc_get_status($process);
  
  while($status['running']) {
  
      sleep (60);
  
      $status = proc_get_status($process);
  
  }
  
  proc_terminate($process);

  Also, as documented at ffmpeg Main-options :

  Enable interaction on standard input. On by default unless standard
  input is used as an input. To explicitly disable interaction you need
  to specify -nostdin.

  The -nostdin option seems to indicate that it addresses my problem, but it has no apparent affect. In all solutions for Unix that I’ve found, it appears to still require some form of this this unix added : null or 2>&1.

  So, with that somewhat exhaustive prologue, can someone explain how to properly configure the proc_open function to satisfy how ffmpeg.exe interacts with I/O ? If there is a better or more appropriate approach, I’m happy to do that, but the important thing is to be able to loop thru an array of processes to check if they’re complete, so that other faster processes can complete in the meantime.

  UPDATE
  After exhaustive R&D, it seems that the I/O is not the issue in making this happen (the -nostdin option seems to work as advertised). The premise of my design was to use proc_get_status() to determine when ffmpeg was finished. The flaw in that approach is that apparently that does NOT return the actual PID of the ffmpeg process...it returns the parent PID. So, when proc_get_status() returned that the video conversion was complete, it was in fact still running, not hung. This was further complicated by testing on larger video files. The larger the video, the longer the "residual" time was that it took to actually finish — the I/O wasn’t the issue - watching the Parent PID instead of the child PID was the problem. So, without getting into much lower level system internals with Windows, this doesn’t appear to be possible with PHP directly. I’ve decided to abandon this approach, but hopefully this discovery will save someone else some time and trouble.

• Executing an exe and reading the OutputStream

  30 septembre 2014, par vlatkozelka

  I have a program called FFprobe which probes media (files/live streams ... ) and outputs result in different formats , for example :

  ffprobe.exe -i test.ts -print_format xml -show_programs

  gives this output :

      <?xml version="1.0" encoding="UTF-8"?>
  
  <ffprobe>
  
      <programs>
  
          <program>
  
              <tag key="service_name" value="Arabica TV"></tag>
  
              <tag key="service_provider" value="Nilesat"></tag>
  
              <streams>
  
                  <stream index="10" profile="Main" width="720" height="576" level="8" timecode="08:28:54:09">
  
                      <disposition default="0" dub="0" original="0" comment="0" lyrics="0" karaoke="0" forced="0"></disposition>
  
                  </stream>
  
                  <stream index="4" channels="2">
  
                      <disposition default="0" dub="0" original="0" comment="0" lyrics="0" karaoke="0" forced="0"></disposition>
  
                  </stream>
  
              </streams>
  
          </program> 
  
  ... more programs 
  
  </programs></ffprobe>

  to retrieve this info in java i used ProcessBuilder and a scanner , and then id write to a file once the result is ok ... but it wasnt :

   Process proc = new ProcessBuilder("ffprobe.exe","-i", ... same arguments );
  
   Scanner sc = new Scanner (proc.getInputStream()) // im 100% sure its not errorStream
  
   while(sc.hasNext()){
  
     System.out.println(sc.nextLine());
  
   }

  the app just hangs with no output , i know its hanging cuz the process is still running and scanner has next , but , i don’t know why it would do that ?If i execute the same in cmd i would get good result and ofc i can write to file with ">"

  Ive tried it w/o the -print_format option , which gives the info in a plain text on the errorstream(i know its error cuz i was able to write with 2> not >> ) , and i was able to read the error stream in java , but its not meant for parsing cuz very very un-organized .

     Input #0, mpegts, from 'PBR_REC_20140426094852_486.ts':
  
    Duration: 00:13:34.30, start: 7791.344722, bitrate: 42154 kb/s
  
    Program 1201 
  
      Metadata:
  
        service_name    : Arabica TV
  
        service_provider: Nilesat
  
      Stream #0:19[0x7db]: Video: mpeg2video (Main) ([2][0][0][0] / 0x0002), yuv420p(tv), 720x576 [SAR 16:15 DAR 4:3], max. 2348 kb/s, 25 fps, 25 tbr, 90k tbn, 50 tbc
  
      Stream #0:3[0xbcf]: Audio: mp2, 48000 Hz, stereo, s16p, 384 kb/s
  
    Program 1202 
  
      Metadata:
  
        service_name    : NBN
  
        service_provider: NILESAT
  
      Stream #0:10[0x7d1]: Video: mpeg2video (Main) ([2][0][0][0] / 0x0002), yuv420p(tv), 720x576 [SAR 16:15 DAR 4:3], max. 2600 kb/s, 25 fps, 25 tbr, 90k tbn, 50 tbc
  
      Stream #0:11[0xbba](eng): Audio: mp2 ([3][0][0][0] / 0x0003), 48000 Hz, stereo, s16p, 125 kb/s
  
    Program 1203 
  
      Metadata:
  
        service_name    : Heya TV
  
        service_provider: NILESAT
  
      Stream #0:5[0x7d2]: Video: mpeg2video (Main) ([2][0][0][0] / 0x0002), yuv420p(tv), 720x576 [SAR 16:15 DAR 4:3], max. 2600 kb/s, 25 fps, 25 tbr, 90k tbn, 50 tbc
  
      Stream #0:6[0xbbc](eng): Audio: mp2 ([3][0][0][0] / 0x0003), 48000 Hz, mono, s16p, 125 kb/s
  
    Program 1204  ... more programs

  now it might seem organized and "parse-able" and i actually made a parser that worked to some point , but sometimes it doesnt stick to this structure and ruins the whole parsing, its why i need a xml/json ...

  The -print_format im sure outputs to outputstream.

  Im not asking for help on how to use FFprobe as thats not this place’s purpose , Im asking why am i not being able to get the output stream from java while it is definitely outputting if i execute in windows .

  I also tried apache commons-exec as i know processbuilder can be a pain ,it did execute perfectly and showed in System.in (black for intput and red for error), but getting the stream with apache is something i couldn’t understand , i tried this example

  The xml parser i already taken care of , simply put i just need to execute that first command from java and read the output , but for some reason its not working .