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• Unable to integrate ffmpeg as a native dependency for an Android NDK project

  24 avril 2016, par mmark

  I have an Android NDK project which consists entirely of C/C++ code, and it basically processes images without using any external libraries.

  I’m using Android Studio + Gradle NDK Experimental plugin (0.7.0-alpha1).

  Now, I need to integrate ffmpeg as a native library to use it from the C/C++ code in order to decode a H.264 video frame.

  These are the questions I’ve found here regarding this issue :

  Android - Integrating ffmpeg and android-ndk-r9c

  Android NDK w/ ffmpeg library - error running project

  Using FFmpeg native libraries with Android-NDK

  Can not build with prebuilt static libraries using gradle-experimental

  Here is my build.gradle file :

  apply plugin: 'com.android.model.application'
  
  
  
  def ffmpeg_path = file(project(':ffmpeg').projectDir).absolutePath + "/ffmpeg-android"
  
  
  
  model {
  
  
  
      repositories {
  
          libs(PrebuiltLibraries) {
  
              libavcodec {
  
                  headers.srcDir "${ffmpeg_path}/include"
  
                  binaries.withType(StaticLibraryBinary) {
  
                      staticLibraryFile = file("${ffmpeg_path}/${targetPlatform.getName()}/lib/libavcodec.a")
  
                  }
  
              }
  
              libavutil {
  
                  headers.srcDir "${ffmpeg_path}/include"
  
                  binaries.withType(StaticLibraryBinary) {
  
                      staticLibraryFile = file("${ffmpeg_path}/${targetPlatform.getName()}/lib/libavutil.a")
  
                  }
  
              }
  
              libswresample {
  
                  headers.srcDir "${ffmpeg_path}/include"
  
                  binaries.withType(StaticLibraryBinary) {
  
                      staticLibraryFile = file("${ffmpeg_path}/${targetPlatform.getName()}/lib/libswresample.a")
  
                  }
  
              }
  
              libswscale {
  
                  headers.srcDir "${ffmpeg_path}/include"
  
                  binaries.withType(StaticLibraryBinary) {
  
                      staticLibraryFile = file("${ffmpeg_path}/${targetPlatform.getName()}/lib/libswscale.a")
  
                  }
  
              }
  
              libavformat {
  
                  headers.srcDir "${ffmpeg_path}/include"
  
                  binaries.withType(StaticLibraryBinary) {
  
                      staticLibraryFile = file("${ffmpeg_path}/${targetPlatform.getName()}/lib/libavformat.a")
  
                  }
  
              }
  
              libavdevice {
  
                  headers.srcDir "${ffmpeg_path}/include"
  
                  binaries.withType(StaticLibraryBinary) {
  
                      staticLibraryFile = file("${ffmpeg_path}/${targetPlatform.getName()}/lib/libavdevice.a")
  
                  }
  
              }
  
              libavfilter {
  
                  headers.srcDir "${ffmpeg_path}/include"
  
                  binaries.withType(StaticLibraryBinary) {
  
                      staticLibraryFile = file("${ffmpeg_path}/${targetPlatform.getName()}/lib/libavfilter.a")
  
                  }
  
              }
  
              libpostproc {
  
                  headers.srcDir "${ffmpeg_path}/include"
  
                  binaries.withType(StaticLibraryBinary) {
  
                      staticLibraryFile = file("${ffmpeg_path}/${targetPlatform.getName()}/lib/libpostproc.a")
  
                  }
  
              }
  
          }
  
      }
  
  
  
      android {
  
          compileSdkVersion = 23
  
          buildToolsVersion = "23.0.2"
  
  
  
          defaultConfig.with {
  
              applicationId = "com.example.hellojni"
  
              minSdkVersion.apiLevel = 4
  
              targetSdkVersion.apiLevel = 23
  
          }
  
      }
  
  
  
      /*
  
       * native build settings
  
       */
  
      android.ndk {
  
          moduleName = "hello-jni"
  
          platformVersion = 9 //same as minSdkVersion.apiLevel for better compatibility
  
          stl    = "c++_static"
  
          abiFilters.addAll(["armeabi", "armeabi-v7a", "x86"]) //filtering ABIs on the ones Google Play Games library is compatible with.
  
      }
  
      android.buildTypes {
  
          release {
  
              minifyEnabled = false
  
              proguardFiles.add(file('proguard-rules.txt'))
  
          }
  
      }
  
  
  
      android.sources {
  
          main {
  
              jni {
  
                  dependencies {
  
                      library "libavcodec" linkage "static"
  
                      library "libavutil" linkage "static"
  
                      library "libswresample" linkage "static"
  
                      library "libswscale" linkage "static"
  
                      library "libavformat" linkage "static"
  
                      library "libavdevice" linkage "static"
  
                      library "libavfilter" linkage "static"
  
                      library "libpostproc" linkage "static"
  
                  }
  
              }
  
          }
  
      }
  
  
  
  }

  I based on this sample from Google which integrates an external native library.

  This is the ffmpeg project I compiled before importing it into mine :
  https://github.com/WritingMinds/ffmpeg-android

  I’ve added all the .a and .h files and I’m able to import the headers in my C/C++ code, but when I try to compile it I get the following error :

  /Users/marcos/Documents/Android/fdecoder/ffmpeg/ffmpeg-android/armeabi-v7a/lib/libavformat.a(utils.o):utils.c:function try_decode_frame: error: undefined reference to 'avpriv_h264_has_num_reorder_frames'
  
  /Users/marcos/Documents/Android/fdecoder/ffmpeg/ffmpeg-android/armeabi-v7a/lib/libavformat.a(utils.o):utils.c:function compute_pkt_fields: error: undefined reference to 'avpriv_h264_has_num_reorder_frames'
  
  /Users/marcos/Documents/Android/fdecoder/ffmpeg/ffmpeg-android/armeabi-v7a/lib/libavformat.a(utils.o):utils.c:function parse_packet: error: undefined reference to 'av_parser_parse2'
  
  /Users/marcos/Documents/Android/fdecoder/ffmpeg/ffmpeg-android/armeabi-v7a/lib/libavformat.a(utils.o):utils.c:function parse_packet: error: undefined reference to 'av_parser_close'
  
  /Users/marcos/Documents/Android/fdecoder/ffmpeg/ffmpeg-android/armeabi-v7a/lib/libavformat.a(utils.o):utils.c:function read_frame_internal: error: undefined reference to 'av_parser_init'
  
  /Users/marcos/Documents/Android/fdecoder/ffmpeg/ffmpeg-android/armeabi-v7a/lib/libavformat.a(utils.o):utils.c:function avformat_find_stream_info: error: undefined reference to 'av_parser_init'
  
  /Users/marcos/Documents/Android/fdecoder/ffmpeg/ffmpeg-android/armeabi-v7a/lib/libavformat.a(utils.o):utils.c:function avformat_find_stream_info: error: undefined reference to 'avcodec_pix_fmt_to_codec_tag'
  
  /Users/marcos/Documents/Android/fdecoder/ffmpeg/ffmpeg-android/armeabi-v7a/lib/libavformat.a(utils.o):utils.c:function avformat_find_stream_info: error: undefined reference to 'avpriv_get_raw_pix_fmt_tags'
  
  /Users/marcos/Documents/Android/fdecoder/ffmpeg/ffmpeg-android/armeabi-v7a/lib/libavformat.a(utils.o):utils.c:function ff_stream_add_bitstream_filter: error: undefined reference to 'av_bitstream_filter_init'
  
  /Users/marcos/Documents/Android/fdecoder/ffmpeg/ffmpeg-android/armeabi-v7a/lib/libavformat.a(utils.o):utils.c:function ff_stream_add_bitstream_filter: error: undefined reference to 'av_bitstream_filter_close'
  
  /Users/marcos/Documents/Android/fdecoder/ffmpeg/ffmpeg-android/armeabi-v7a/lib/libavformat.a(utils.o):utils.c:function av_apply_bitstream_filters: error: undefined reference to 'av_bitstream_filter_filter'
  
  /Users/marcos/Documents/Android/fdecoder/ffmpeg/ffmpeg-android/armeabi-v7a/lib/libavformat.a(aadec.o):aadec.c:function aa_read_packet: error: undefined reference to 'av_tea_init'
  
  /Users/marcos/Documents/Android/fdecoder/ffmpeg/ffmpeg-android/armeabi-v7a/lib/libavformat.a(aadec.o):aadec.c:function aa_read_packet: error: undefined reference to 'av_tea_crypt'
  
  /Users/marcos/Documents/Android/fdecoder/ffmpeg/ffmpeg-android/armeabi-v7a/lib/libavformat.a(aadec.o):aadec.c:function aa_read_header: error: undefined reference to 'av_tea_alloc'
  
  /Users/marcos/Documents/Android/fdecoder/ffmpeg/ffmpeg-android/armeabi-v7a/lib/libavformat.a(aadec.o):aadec.c:function aa_read_header: error: undefined reference to 'av_tea_init'
  
  /Users/marcos/Documents/Android/fdecoder/ffmpeg/ffmpeg-android/armeabi-v7a/lib/libavformat.a(aadec.o):aadec.c:function aa_read_header: error: undefined reference to 'av_tea_crypt'
  
  /Users/marcos/Documents/Android/fdecoder/ffmpeg/ffmpeg-android/armeabi-v7a/lib/libavformat.a(ac3dec.o):ac3dec.c:function ac3_eac3_probe.isra.0: error: undefined reference to 'avpriv_ac3_parse_header'
  
  /Users/marcos/Documents/Android/fdecoder/ffmpeg/ffmpeg-android/armeabi-v7a/lib/libavformat.a(adtsenc.o):adtsenc.c:function adts_write_header: error: undefined reference to 'avpriv_mpeg4audio_get_config'
  
  /Users/marcos/Documents/Android/fdecoder/ffmpeg/ffmpeg-android/armeabi-v7a/lib/libavformat.a(adtsenc.o):adtsenc.c:function adts_write_header: error: undefined reference to 'avpriv_copy_pce_data'
  
  /Users/marcos/Documents/Android/fdecoder/ffmpeg/ffmpeg-android/armeabi-v7a/lib/libavformat.a(asfcrypt.o):asfcrypt.c:function ff_asfcrypt_dec: error: undefined reference to 'av_rc4_alloc'
  
  /Users/marcos/Documents/Android/fdecoder/ffmpeg/ffmpeg-android/armeabi-v7a/lib/libavformat.a(asfcrypt.o):asfcrypt.c:function ff_asfcrypt_dec: error: undefined reference to 'av_rc4_init'
  
  /Users/marcos/Documents/Android/fdecoder/ffmpeg/ffmpeg-android/armeabi-v7a/lib/libavformat.a(asfcrypt.o):asfcrypt.c:function ff_asfcrypt_dec: error: undefined reference to 'av_rc4_crypt'
  
  /Users/marcos/Documents/Android/fdecoder/ffmpeg/ffmpeg-android/armeabi-v7a/lib/libavformat.a(asfcrypt.o):asfcrypt.c:function ff_asfcrypt_dec: error: undefined reference to 'av_rc4_init'
  
  /Users/marcos/Documents/Android/fdecoder/ffmpeg/ffmpeg-android/armeabi-v7a/lib/libavformat.a(asfcrypt.o):asfcrypt.c:function ff_asfcrypt_dec: error: undefined reference to 'av_rc4_crypt'
  
  /Users/marcos/Documents/Android/fdecoder/ffmpeg/ffmpeg-android/armeabi-v7a/lib/libavformat.a(matroska.o):matroska.c:function ff_mkv_stereo3d_conv: error: undefined reference to 'av_stereo3d_alloc'
  
  /Users/marcos/Documents/Android/fdecoder/ffmpeg/ffmpeg-android/armeabi-v7a/lib/libavformat.a(nut.o):nut.c:function ff_nut_add_sp: error: undefined reference to 'av_tree_node_alloc'
  
  /Users/marcos/Documents/Android/fdecoder/ffmpeg/ffmpeg-android/armeabi-v7a/lib/libavformat.a(nut.o):nut.c:function ff_nut_add_sp: error: undefined reference to 'av_tree_insert'
  
  /Users/marcos/Documents/Android/fdecoder/ffmpeg/ffmpeg-android/armeabi-v7a/lib/libavformat.a(nut.o):nut.c:function ff_nut_free_sp: error: undefined reference to 'av_tree_enumerate'
  
  /Users/marcos/Documents/Android/fdecoder/ffmpeg/ffmpeg-android/armeabi-v7a/lib/libavformat.a(nut.o):nut.c:function ff_nut_free_sp: error: undefined reference to 'av_tree_destroy'
  
  Error:error: ld returned 1 exit status
  
  Error:Execution failed for task ':app:linkHello-jniArmeabi-v7aDebugSharedLibrary'.
  
  > A build operation failed.
  
        Linker failed while linking libhello-jni.so.
  
    See the complete log at: file:///Users/marcos/Documents/Android/fdecoder/app/build/tmp/linkHello-jniArmeabi-v7aDebugSharedLibrary/output.txt
  
  Information:BUILD FAILED
  
  Information:Total time: 14.993 secs
  
  Information:2 errors
  
  Information:0 warnings
  
  Information:See complete output in console

  There’s obviously something I’m not importing properly, but can’t figure exactly what’s missing.

• Simulate packet loss in internet video streaming

  31 décembre 2015, par james

  I have encoded H.264 video using FFmpeg. I want to apply packet loss model like Gilbert Eliot model to depict video transmission over unreliable network.Like in this thread TV noise is simulated. But noise on the internet is different. So is there a way to simulate packet loss/ noise for internet video streaming using FFmpeg or MATLAB ?

• C# Recording 3D object ffmpeg

  1er décembre 2015, par Skyx

  I want to make a screen recording on my application in C# which has a 3D model in it. I found out that i can do the recording with ffmpeg. I implemented the CopyFromScreen function which records the whole screen.

  CopyFromScreen.graphics.CopyFromScreen(Screen.PrimaryScreen.Bounds.X, Screen.PrimaryScreen.Bounds.Y, 0, 0, Screen.PrimaryScreen.Bounds.Size);

  I want to record only my 3D model viewport without recording the whole screen. Does anyone know or experience working with ffmpeg recording just the specifiek object or a 3D viewport ?

  private readonly HelixViewport3D _viewport = new HelixViewport3D(); // my 3D model viewport