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• FFMpeg on Android, undefined references to libavcodec functions, although it is listed on command line

  24 mars 2019, par dimsuz

  I have a problem with unresolved references to ffmpeg’s libavcodec functions, so far failed to find the answer in other places (including my mind) :)

  Let me describe my setup - it takes space, but is really basic, it might be that I’m failing to see some error...

  I built an FFMPeg with ndk r5 toolchain, ffmpeg port I got from http://bambuser.com/opensource (as recommended in other questions here). It built fine, so I put several static libraries in my project like this :

  <project>/jni/bambuser_ffmpeg/libavcodec.a
  
  <project>/jni/bambuser_ffmpeg/libavformat.a
  
  <project>/jni/bambuser_ffmpeg/libavcore.a
  
  <project>/jni/bambuser_ffmpeg/libavutil.a
  
  </project></project></project></project>

  Next, I created an Android.mk in bambuser_ffmpeg folder to list these libs as a prebuilt ones :

  LOCAL_PATH := $(call my-dir)
  
  
  
  include $(CLEAR_VARS)
  
  LOCAL_MODULE := bambuser-libavcore
  
  LOCAL_SRC_FILES := libavcore.a
  
  include $(PREBUILT_STATIC_LIBRARY)
  
  
  
  include $(CLEAR_VARS)
  
  LOCAL_MODULE := bambuser-libavformat
  
  LOCAL_SRC_FILES := libavformat.a
  
  include $(PREBUILT_STATIC_LIBRARY)
  
  
  
  (same for other two libs)

  Next, I have another module which references these libs in its Android.mk, sets up include paths, etc :

  LOCAL_PATH := $(call my-dir)
  
  
  
  include $(CLEAR_VARS)
  
  
  
  LOCAL_MODULE := ffmpegtest
  
  LOCAL_STATIC_LIBRARIES := bambuser-libavcodec bambuser-libavcore bambuser-libavformat bambuser-libavutil
  
  LOCAL_SRC_FILES := ffmpeg_test.cpp
  
  LOCAL_C_INCLUDES := $(LOCAL_PATH)/../bambuser_ffmpeg/include
  
  LOCAL_LDLIBS    := -llog -lz
  
  
  
  include $(BUILD_SHARED_LIBRARY)

  And finally I have my ffmpeg_test.cpp which is really basic, like this :

  #include 
  
  
  
  extern "C" {
  
  #include <libavcodec></libavcodec>avcodec.h>
  
  #include <libavformat></libavformat>avformat.h>
  
  }
  
  
  
  extern "C" {
  
      JNIEXPORT jint JNICALL Java_com_the7art_ffmpegtest_PaintThread_testFFMpeg(JNIEnv* env, jobject obj, jstring fileName);
  
  }
  
  
  
  JNIEXPORT jint JNICALL Java_com_the7art_ffmpegtest_PaintThread_testFFMpeg(JNIEnv* env, jobject obj, jstring fileName)
  
  {
  
      av_register_all();
  
      return 0;
  
  }

  When I run ndk-build, it compiles fine, but when linking it prints an unresolved reference to almost every function in libavcodec. Looks like only this lib’s functions are failing to be located :

  /home/dimka/src/mobile/android/ffmpegtest/obj/local/armeabi/libavformat.a(allformats.o): In function `av_register_all':
  
  /home/dimka/work/suzy/tmp/ffmpeg-android/ffmpeg/libavformat/allformats.c:47: undefined reference to `avcodec_register_all'
  
  /home/dimka/src/mobile/android/ffmpegtest/obj/local/armeabi/libavformat.a(utils.o): In function `parse_frame_rate':
  
  /home/dimka/work/suzy/tmp/ffmpeg-android/ffmpeg/libavformat/utils.c:3240: undefined reference to `av_parse_video_rate'
  
  /home/dimka/src/mobile/android/ffmpegtest/obj/local/armeabi/libavformat.a(utils.o): In function `parse_image_size':
  
  /home/dimka/work/suzy/tmp/ffmpeg-android/ffmpeg/libavformat/utils.c:3234: undefined reference to `av_parse_video_size'
  
  /home/dimka/src/mobile/android/ffmpegtest/obj/local/armeabi/libavformat.a(utils.o): In function `flush_packet_queue':
  
  /home/dimka/work/suzy/tmp/ffmpeg-android/ffmpeg/libavformat/utils.c:1277: undefined reference to `av_free_packet'
  
  /home/dimka/work/suzy/tmp/ffmpeg-android/ffmpeg/libavformat/utils.c:1283: undefined reference to `av_free_packet'
  
  /home/dimka/src/mobile/android/ffmpegtest/obj/local/armeabi/libavformat.a(utils.o): In function `get_audio_frame_size':
  
  /home/dimka/work/suzy/tmp/ffmpeg-android/ffmpeg/libavformat/utils.c:766: undefined reference to `av_get_bits_per_sample'
  
  /home/dimka/src/mobile/android/ffmpegtest/obj/local/armeabi/libavformat.a(utils.o): In function `ff_interleave_add_packet':
  
  /home/dimka/work/suzy/tmp/ffmpeg-android/ffmpeg/libavformat/utils.c:2909: undefined reference to `av_dup_packet'
  
  and so on...

  I fail to figure why this is happening. I tried running ndk-build V=1 to check the actual linking command, and libavcodec is sitting there perfectly right, like it should. All other ffmpeg libs are there too.

  Any hints ?

• ffmpeg problems (mpeg1video -> ?)

  3 juillet 2015, par Inglonias

  I’m trying to convert various video files from .mpeg to .ogg theora videos. This command works fine when I test it in its own program, but fails to run properly inside the program it was intended for. I don’t understand what’s breaking here. Adding a -vcodec flag causes other errors.

  Here is the function I am using to run ffmpeg :

   * This method converts a file to Ogg Theora video using ffmpeg.
  
   * 
  
   * @param f
  
   *            The file to encode. (Assumes that the file has a .mpeg
  
   *            extension. If the file doesn't have this, the method will
  
   *            fail.) 
  
   * @param nice The niceness of the created ffmpeg
  
   *            priority.
  
   * @return converter The process that represents ffmpeg working on the file.
  
   */
  
  private Process encodeFileAsTheora(File f, int nice) {
  
      Process converter = null;
  
      try {
  
          String targetFileName = f.getAbsolutePath()
  
                  .replace(".mpeg", ".ogg");
  
          // mLogger.log(Level.INFO,
  
          // "Now attempting to convert " + f.getAbsolutePath());
  
          String[] ffmpegCommand = { "nice", "-n", Integer.toString(nice),
  
                  "ffmpeg", "-i", f.getAbsolutePath(), targetFileName };
  
          converter = Runtime.getRuntime().exec(ffmpegCommand);
  
      } catch (IOException e) {
  
          // TODO Auto-generated catch block
  
          e.printStackTrace();
  
      }
  
      return converter;
  
  }

  And here is its getErrorStream() output to the logger :

  NON RELEVANT CONTENT REMOVED

  configuration : —extra-ldflags=-L/home/user/trunk/cpp_src/ffmpeg-source/libvpx —extra-ldflags=-L/home/user/trunk/cpp_src/ffmpeg-source/x264 —extra-cflags=-I/home/user/trunk/cpp_src/ffmpeg-source/x264 —extra-cflags=-I/home/user/trunk/cpp_src/ffmpeg-source/libvpx —enable-libvpx —enable-libx264 —enable-gpl —yasmexe=/home/user/trunk/cpp_src/ffmpeg-source/yasm/yasm

• Android JNI x264 as a library give relocation R_ARM_MOVW_ABS_NC ; recompile with -fPIC

  25 juin 2014, par MoAdiB

  I’m trying to build x264 library to use it in a shared library that I load using jni on android. I’m able to build everything as an executable without any error but when I build as a shared library I get errors with dynamic relocation of R_ARM_MOVW_ABS_NC :

  [armeabi-v7a] SharedLibrary  : libx264.so
  
  /home/martin/bin/android-ndk/toolchains/arm-linux-androideabi-4.8/prebuilt/linux-x86_64/bin/../lib/gcc/arm-linux-androideabi/4.8/../../../../arm-linux-androideabi/bin/ld: error: /home/martin/Documents/Sources/ScreenSharingServer/app/src/main/obj/local/armeabi-v7a/objs/x264/common/arm/pixel-a.o: requires unsupported dynamic reloc R_ARM_MOVW_ABS_NC; recompile with -fPIC
  
  /home/martin/bin/android-ndk/toolchains/arm-linux-androideabi-4.8/prebuilt/linux-x86_64/bin/../lib/gcc/arm-linux-androideabi/4.8/../../../../arm-linux-androideabi/bin/ld: error: /home/martin/Documents/Sources/ScreenSharingServer/app/src/main/obj/local/armeabi-v7a/objs/x264/common/arm/mc-a.o: requires unsupported dynamic reloc R_ARM_MOVW_ABS_NC; recompile with -fPIC
  
  /home/martin/bin/android-ndk/toolchains/arm-linux-androideabi-4.8/prebuilt/linux-x86_64/bin/../lib/gcc/arm-linux-androideabi/4.8/../../../../arm-linux-androideabi/bin/ld: error: /home/martin/Documents/Sources/ScreenSharingServer/app/src/main/obj/local/armeabi-v7a/objs/x264/common/arm/dct-a.o: requires unsupported dynamic reloc R_ARM_MOVW_ABS_NC; recompile with -fPIC
  
  /home/martin/bin/android-ndk/toolchains/arm-linux-androideabi-4.8/prebuilt/linux-x86_64/bin/../lib/gcc/arm-linux-androideabi/4.8/../../../../arm-linux-androideabi/bin/ld: error: /home/martin/Documents/Sources/ScreenSharingServer/app/src/main/obj/local/armeabi-v7a/objs/x264/common/arm/quant-a.o: requires unsupported dynamic reloc R_ARM_MOVW_ABS_NC; recompile with -fPIC
  
  /home/martin/bin/android-ndk/toolchains/arm-linux-androideabi-4.8/prebuilt/linux-x86_64/bin/../lib/gcc/arm-linux-androideabi/4.8/../../../../arm-linux-androideabi/bin/ld: error: /home/martin/Documents/Sources/ScreenSharingServer/app/src/main/obj/local/armeabi-v7a/objs/x264/common/arm/predict-a.o: requires unsupported dynamic reloc R_ARM_MOVW_ABS_NC; recompile with -fPIC
  
  collect2: error: ld returned 1 exit status
  
  make: *** [/home/martin/Documents/Sources/ScreenSharingServer/app/src/main/obj/local/armeabi-v7a/libx264.so] Error 1

  Here is my android.mk :

  LOCAL_PATH := $(my-dir)
  
  
  
  include $(CLEAR_VARS)
  
  
  
  APP_ABI := armeabi armeabi-v7a
  
  TARGET_ARCH_ABI := armeabi-v7a
  
  LOCAL_ARM_NEON := true
  
  ARCH_ARM_HAVE_NEON := true
  
  
  
  AM_CFLAGS := -march=armv7-a -mfpu=neon
  
  AM_CCASFLAGS := -march=armv7-a -mfpu=neon
  
  
  
  LOCAL_SRC_FILES:= common/mc.c common/predict.c common/pixel.c common/macroblock.c \
  
         common/frame.c common/dct.c common/cpu.c common/cabac.c \
  
         common/common.c common/osdep.c common/rectangle.c \
  
         common/set.c common/quant.c common/deblock.c common/vlc.c \
  
         common/mvpred.c common/bitstream.c \
  
         encoder/analyse.c encoder/me.c encoder/ratecontrol.c \
  
         encoder/set.c encoder/macroblock.c encoder/cabac.c \
  
         encoder/cavlc.c encoder/encoder.c encoder/lookahead.c \
  
         common/threadpool.c \
  
         common/arm/mc-c.c common/arm/predict-c.c \
  
         x264.c \
  
         common/arm/cpu-a.S common/arm/pixel-a.S common/arm/mc-a.S \
  
         common/arm/dct-a.S common/arm/quant-a.S common/arm/deblock-a.S \
  
         common/arm/predict-a.S
  
  
  
  LOCAL_SHARED_LIBRARIES := libcutils
  
  LOCAL_STATIC_LIBRARIES := swscale
  
  
  
  LOCAL_C_INCLUDES := $(LOCAL_PATH) $(LOCAL_PATH)/..
  
  LOCAL_EXPORT_C_INCLUDES := $(LOCAL_PATH) $(LOCAL_PATH)/..
  
  
  
  LOCAL_CFLAGS := -fPIC -O3 -ffast-math -fstrict-aliasing -DANDROID -std=c99
  
  LOCAL_CPPFLAGS := -fPIC
  
  LOCAL_LDFLAGS := -lm
  
  LOCAL_MODULE := x264
  
  
  
  include $(BUILD_SHARED_LIBRARY)

  When I build with V=1 I see -fPIC option in every compilation line...

  I wonder if anybody can help me understand what I do wrong.

  Thanks for your time !

  Martin