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• Libav linking error : undefined references

  22 février 2017, par Fedech

  Here’s my problem :

  • I built ffmpeg from source (version 1.2), the libav* libraries are in /usr/local/lib and they’re static
  • I’m compiling a ns3 (www.nsnam.org) module, so my only control over the linker is through the env variable LINKFLAGS
  • In the source the headers are in a "extern C" block, so it’s not the usual g++ name mangling
  • I set LINKFLAGS="-I/usr/local/include/libavformat -I/usr/local/include/libavcodec -I/usr/local/include/libavutil -L/usr/local/lib -lavformat -lavcodec -lavutil", and the linker can’t seem to find any of the libav* functions I call (I get a lot of "undefined reference" and then "collect2 : error : ld returned status 1"

  Can anyone help me ? Thanks...

  edit : here are a few of the undefined reference messages :

      ./libns3.14.1-qoe-monitor-debug.so: undefined reference to `av_guess_format'
  
      ./libns3.14.1-qoe-monitor-debug.so: undefined reference to `av_read_frame'
  
      ./libns3.14.1-qoe-monitor-debug.so: undefined reference to `avformat_write_header'
  
      ./libns3.14.1-qoe-monitor-debug.so: undefined reference to `av_interleaved_write_frame'
  
      ./libns3.14.1-qoe-monitor-debug.so: undefined reference to `av_find_stream_info'
  
      ./libns3.14.1-qoe-monitor-debug.so: undefined reference to `av_register_all'
  
      ./libns3.14.1-qoe-monitor-debug.so: undefined reference to `av_init_packet'
  
      ./libns3.14.1-qoe-monitor-debug.so: undefined reference to `avformat_alloc_context'
  
      ./libns3.14.1-qoe-monitor-debug.so: undefined reference to `av_dump_format'
  
      ./libns3.14.1-qoe-monitor-debug.so: undefined reference to `avio_close'

  edit2 : here is the message I get after "build failed" :

  -> task in 'scratch-simulator' failed (exit status 1): 
  
  {task 53952272: cxxprogram scratch-simulator.cc.1.o -> scratch-simulator}
  
  ['/usr/bin/g++', '-I/usr/local/include/libavcodec', '-I/usr/local/include/libavformat/',
  
   '-I/usr/local/include/libavutil/', '-L/usr/local/lib', '-I/usr/local
  
  /include/libavcodec', '-I/usr/local/include/libavformat/', '-I/usr/local/include
  
  /libavutil/', '-L/usr/local/lib', '-pthread', '-pthread', '-Wl,-z,relro', 
  
  'scratch/scratch-simulator.cc.1.o', '-o', '/home/fede/Thesis/ns-allinone-3.14.1
  
  /ns-3.14.1/build/scratch/scratch-simulator', '-Wl,-Bstatic', '-Wl,-Bdynamic', 
  
  '-Wl,--no-as-needed', '-L.', '-L.', '-L.', '-L.', '-L.', '-L.', '-L.', '-L.', '-L.',
  
   '-L.', '-L.', '-L.', '-L.', '-L.', '-L.', '-L.', '-L.', '-L.', '-L.', '-L.', '-L.',
  
   '-L.', '-L.', '-L.', '-L.', '-L.', '-L.', '-L.', '-L.', '-L.', '-L.', '-L.', '-L.', 
  
  '-L.', '-L.', '-L.', '-L.', '-L.', '-L/usr/lib', '-lns3.14.1-test-debug', '-lns3.14.1-
  
  csma-layout-debug', '-lns3.14.1-point-to-point-layout-debug', '-lns3.14.1-netanim-
  
  debug', '-lns3.14.1-lte-debug', '-lns3.14.1-spectrum-debug', '-lns3.14.1-antenna-
  
  debug', '-lns3.14.1-aodv-debug', '-lns3.14.1-dsdv-debug', '-lns3.14.1-dsr-debug', 
  
  '-lns3.14.1-mesh-debug', '-lns3.14.1-olsr-debug', '-lns3.14.1-csma-debug', '-lns3.14.1-
  
  wimax-debug', '-lns3.14.1-applications-debug', '-lns3.14.1-virtual-net-device-debug', 
  
  '-lns3.14.1-uan-debug', '-lns3.14.1-energy-debug', '-lns3.14.1-flow-monitor-debug', 
  
  '-lns3.14.1-nix-vector-routing-debug', '-lns3.14.1-tap-bridge-debug', '-lns3.14.1-
  
  visualizer-debug', '-lns3.14.1-internet-debug', '-lns3.14.1-bridge-debug', '-lns3.14.1-
  
  point-to-point-debug', '-lns3.14.1-mpi-debug', '-lns3.14.1-wifi-debug', '-lns3.14.1-
  
  buildings-debug', '-lns3.14.1-propagation-debug', '-lns3.14.1-mobility-debug', 
  
  '-lns3.14.1-config-store-debug', '-lns3.14.1-tools-debug', '-lns3.14.1-stats-debug',
  
   '-lns3.14.1-emu-debug', '-lns3.14.1-topology-read-debug', '-lns3.14.1-network-debug', 
  
  '-lns3.14.1-qoe-monitor-debug', '-lns3.14.1-core-debug', '-lrt', '-lgsl', 
  
  '-lgslcblas', '-lm', '-ldl', '-lgtk-x11-2.0', '-lgdk-x11-2.0', '-latk-1.0', 
  
  '-lgio-2.0', '-lpangoft2-1.0', '-lpangocairo-1.0', '-lgdk_pixbuf-2.0', '-lcairo', 
  
  '-lpango-1.0', '-lfreetype', '-lfontconfig', '-lgobject-2.0', '-lglib-2.0', '-lxml2', 
  
  '-lpython2.7']

• how to save h264 stream into .264 file

  6 mars 2015, par user3547405

  I’m using nginx-rtmp-module build hls server, when I play it on safari, it does not shows image,then i use this command ffmpeg -i rtmp://192.168.4.213/hls/testH264 -c copy -map 0 -f segment -segment_list playlist.m3u8 -segment_time 5 output%03d.ts, it shows missing picture in access unit with size 28184,so i think maybe the raw h264 stream has some problem,then i directly save the h264 stream into .264 file,but when i play the .264 file with vlc,the screen is fuzzy,help

• Trying to use FFMPEG for android. Compiling but still not working

  15 avril 2014, par Austin Mueller

  So to start off... Im trying to use ffmpeg to compile an array of images into a video on Android.

  I have followed a variety of tutorials online and have gotten as far as being able to compile the lib for Android and still have to project run.
  The repo im now using can be found here : https://github.com/Batterii/android-ffmpeg-x264

  I made a couple tweaks to the setttings.sh just to correct ndk location. Besides that, I followed the instructions and it seemed to work flawlessly.

  After that, I converted the "Project" project into an Android stdio library module.
  

  I am not getting any compile errors, nor am I getting any runtime errors, or any other errors that I can detect... Nothing on logcat... But I am definitely not getting any video called out.mp4.
  In an onCreate of a particular activity, I am running this code :

  Videokit vk = new Videokit();
  
  vk.run(new String[]{"ffmpeg", "-r", "1/5", "-i", "%d.jpg", "-c:v", "libx264", "-r", "30", "-pix_fmt", "yuv420p", project.getProjectDirectory() + "/out.mp4"});

  This command is taken from the command line example found here :
  https://trac.ffmpeg.org/wiki/Create%20a%20video%20slideshow%20from%20images

  Thank you in advance for anyone taking the time to look through this post... I am pretty baffled at this point, as there are no errors I can find and no video...
  Thanks

  ======================================================================

  Update

  Turns out it is not actually compiling correctly... but i have found a few things.
  here is the make file from the Eclipse version of the project

  LOCAL_PATH := $(call my-dir)
  
  
  
  include $(CLEAR_VARS)
  
  LOCAL_MODULE  := videokit
  
  # These need to be in the right order
  
  FFMPEG_LIBS := $(addprefix ffmpeg/, \
  
   libavdevice/libavdevice.a \
  
   libavformat/libavformat.a \
  
   libavfilter/libavfilter.a \
  
   libavcodec/libavcodec.a \
  
   libswscale/libswscale.a \
  
   libavutil/libavutil.a \
  
   libswresample/libswresample.a \
  
   libpostproc/libpostproc.a )
  
  # ffmpeg uses its own deprecated functions liberally, so turn off that annoying noise
  
  LOCAL_CFLAGS += -g -Iffmpeg -Ivideokit -Wno-deprecated-declarations 
  
  LOCAL_LDLIBS += -llog -lz $(FFMPEG_LIBS) x264/libx264.a
  
  LOCAL_SRC_FILES :=  ffmpeg/cmdutils.c ffmpeg/ffmpeg.c videokit/uk_co_halfninja_videokit_Videokit.c
  
  include $(BUILD_SHARED_LIBRARY)

  and here is the make file that gradle is auto-generating for me... thanks to Android Studio...

  LOCAL_PATH := $(call my-dir)
  
  include $(CLEAR_VARS)
  
  
  
  LOCAL_MODULE := videokit
  
  LOCAL_CFLAGS := -g -Isrc/main/jni/ffmpeg -Isrc/main/jni/videokit -Wno-deprecated-declarations
  
  LOCAL_LDLIBS := \
  
      -lffmpeg/libavformat/libavformat.a \
  
      -lffmpeg/libavcodec/libavcodec.a \
  
      -lffmpeg/libswresample/libswresample.a \
  
      -lffmpeg/libavfilter/libavfilter.a \
  
      -lffmpeg/libpostproc/libpostproc.a \
  
      -lffmpeg/libavdevice/libavdevice.a \
  
      -lx264/libx264.a \
  
      -lffmpeg/libavutil/libavutil.a \
  
      -llog \
  
      -lz \
  
      -lffmpeg/libswscale/libswscale.a \
  
  
  
  LOCAL_SRC_FILES := \
  
      Project/Module/src/main/jni/ffmpeg/cmdutils.c \
  
      Project/Module/src/main/jni/ffmpeg/ffmpeg.c \
  
      Project/Module/src/main/jni/videokit/com_t10_project_util_FfmpegHelper.c \
  
  
  
  LOCAL_C_INCLUDES += Project/Module/src/main/jni/ffmpeg/cmdutils.c
  
  LOCAL_C_INCLUDES += Project/Module/src/main/jni/ffmpeg/ffmpeg.c
  
  LOCAL_C_INCLUDES += Project/Module/src/main/jni/videokit/com_t10_project_util_FfmpegHelper.c
  
  LOCAL_C_INCLUDES += Project/Module/src/arm/jni
  
  LOCAL_C_INCLUDES += Project/Module/src/debug/jni
  
  LOCAL_C_INCLUDES += Project/Module/src/armDebug/jni
  
  
  
  include $(BUILD_SHARED_LIBRARY)

  And finally, here is my build.gradle

  apply plugin: 'android'
  
  
  
  android {
  
      compileSdkVersion 19
  
      buildToolsVersion '19.0.1'
  
  
  
      defaultConfig {
  
          minSdkVersion 14
  
          targetSdkVersion 19
  
          versionCode 1
  
          versionName "1.0"
  
  
  
          ndk {
  
              moduleName "videokit"
  
              stl "stlport_shared"
  
              ldLibs "log", "z",
  
                      "ffmpeg/libavdevice/libavdevice.a",
  
                      "ffmpeg/libavformat/libavformat.a",
  
                      "ffmpeg/libavfilter/libavfilter.a",
  
                      "ffmpeg/libavcodec/libavcodec.a",
  
                      "ffmpeg/libswscale/libswscale.a",
  
                      "ffmpeg/libavutil/libavutil.a",
  
                      "ffmpeg/libswresample/libswresample.a",
  
  
  
  
  
                "ffmpeg/libpostproc/libpostproc.a",
  
                  "x264/libx264.a"
  
              cFlags "-g -Isrc/main/jni/ffmpeg -Isrc/main/jni/videokit -Wno-deprecated-declarations"
  
  
  
          }
  
      }
  
  
  
      sourceSets.main {
  
          jniLibs.srcDir 'src/main/libs'
  
          jni.srcDirs = ['src/main/jni/ffmpeg/cmdutils.c',
  
                         'src/main/jni/ffmpeg/ffmpeg.c',
  
                         'src/main/jni/videokit/com_t10_project_util_FfmpegHelper.c']
  
      }
  
  
  
      productFlavors {
  
          x86 {
  
              versionCode Integer.parseInt("6" + defaultConfig.versionCode)
  
              ndk {
  
                  abiFilter "x86"
  
              }
  
          }
  
          mips {
  
              versionCode Integer.parseInt("4" + defaultConfig.versionCode)
  
              ndk {
  
                  abiFilter "mips"
  
              }
  
          }
  
          armv7 {
  
              versionCode Integer.parseInt("2" + defaultConfig.versionCode)
  
              ndk {
  
                  abiFilter "armeabi-v7a"
  
              }
  
          }
  
          arm {
  
              versionCode Integer.parseInt("1" + defaultConfig.versionCode)
  
              ndk {
  
                  abiFilter "armeabi"
  
              }
  
          }
  
          fat
  
      }
  
  
  
      buildTypes {
  
          release {
  
              runProguard false
  
              proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.txt'
  
          }
  
      }
  
  }
  
  
  
  dependencies {
  
      compile 'com.android.support:support-v4:19.0.0'
  
      compile fileTree(dir: 'libs', include: ['*.jar', '*.aar'])
  
  }

  As you can see, my build.gradle generates something that is pretty close to the original... but not the same. When i try to run/compile it, gradle spits this out

  Executing tasks: [:Project:assembleArmDebug]
  
  
  
  :Project:compileArmDebugNdkcc1: warning: Project/Module/src/main/jni/ffmpeg/cmdutils.c: not a directory [enabled by default]
  
  cc1: warning: Project/Module/src/main/jni/ffmpeg/ffmpeg.c: not a directory [enabled by default]
  
  cc1: warning: Project/Module/src/main/jni/videokit/com_t10_project_util_FfmpegHelper.c: not a directory [enabled by default]
  
  In file included from Project/Module/src/main/jni/ffmpeg/cmdutils.c:32:0:
  
  Project/Module/src/main/jni/ffmpeg/libavformat/avformat.h:82:32: fatal error: libavcodec/avcodec.h: No such file or directory
  
  compilation terminated.
  
  make: *** [Project/Module/build/ndk/arm/debug/obj/local/armeabi/objs/videokit/Project/Module/src/main/jni/ffmpeg/cmdutils.o] Error 1
  
   FAILED
  
  
  
  FAILURE: Build failed with an exception.
  
  
  
  * What went wrong:
  
  Execution failed for task ':Project:compileArmDebugNdk'.
  
  > com.android.ide.common.internal.LoggedErrorException: Failed to run command:
  
      android-ndk-r9d/ndk-build NDK_PROJECT_PATH=null APP_BUILD_SCRIPT=Project/Module/build/ndk/arm/debug/Android.mk APP_PLATFORM=android-19 NDK_OUT=Project/Module/build/ndk/arm/debug/obj NDK_LIBS_OUT=Project/Module/build/ndk/arm/debug/lib APP_STL=stlport_shared APP_ABI=armeabi
  
    Error Code:
  
      2
  
    Output:
  
      cc1: warning: Project/Module/src/main/jni/ffmpeg/cmdutils.c: not a directory [enabled by default]
  
      cc1: warning: Project/Module/src/main/jni/ffmpeg/ffmpeg.c: not a directory [enabled by default]
  
      cc1: warning: Project/Module/src/main/jni/videokit/com_t10_project_util_FfmpegHelper.c: not a directory [enabled by default]
  
      In file included from Project/Module/src/main/jni/ffmpeg/cmdutils.c:32:0:
  
      Project/Module/src/main/jni/ffmpeg/libavformat/avformat.h:82:32: fatal error: libavcodec/avcodec.h: No such file or directory
  
      compilation terminated.
  
      make: *** [Project/Module/build/ndk/arm/debug/obj/local/armeabi/objs/videokit/Project/Module/src/main/jni/ffmpeg/cmdutils.o] Error 1
  
  
  
  
  
  * Try:
  
  Run with --stacktrace option to get the stack trace. Run with --info or --debug option to get more log output.
  
  
  
  BUILD FAILED
  
  
  
  Total time: 8.184 secs

  I've been messing around with it for a couple hours now and pretty much every time, i get gradle yelling at me about the fact that it can't find some file. I'm beginning to think that maybe it is because my LOCAL_LDLIBS aren't in the same order as the original...? Im not entirely sure... Does anyone else have any ideas...?