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• [FFmpeg]what is replacements of avpicture_alloc,avpicture::data which were deprecated

  12 avril 2016, par YJJ

  I am modifying example source code(muxing.c) from FFmpeg site.
  I changed old functions to new ones and tried to build the code.
  then, there are several errrors said AVPicture was declared deprecated.

  I did some research on the internet but couldn’t find the answer how to fix it.

  /* Allocate the encoded raw picture. */
  
  ret = avpicture_alloc(&dst_picture, c->pix_fmt, c->width, c->height);
  
  if (ret < 0)
  
  {
  
      //fprintf(stderr, "Could not allocate picture: %s\n", av_err2str(ret));
  
      char buf[256];
  
      av_strerror(ret, buf, sizeof(buf));
  
      printf("Could not allocate picture: %s,ret:%d\n", buf, ret);
  
      exit(1);
  
  }

• 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.

• Encode Android's frame's .raw file to .png file format using ffmpeg

  12 avril 2017, par Glex

  I used the script from source. What it does is that it reads the frame-buffer information from the mobile (android) phone and save it as a .raw file. It then uses ffmpeg encoder to create .png file. Unfortunately the png image that I am getting is like (attached below). I tried to play with the "-pix_fmt" option used and tried using rgba instead of rgb32 used in that code (none of them work btw). I used another script (ascreenshooter.py) to analyse the header for this raw image to find few image headers. they are listed as :

  version : 1
  bpp : 32
  size : 2088960
  width : 544
  height : 960
  red_offset : 0
  red_length : 8
  blue_offset : 16
  blue_length : 8
  green_offset : 8
  green_length : 8
  alpha_offset : 0
  alpha_length : 8

  Please suggest if it is possible to encode this .raw image file to png format. If it is possible than what ffmpeg options I should use and if some other more efficient tool does exit for this encoding process.

  Sample raw image as requested :

  http://tabak.csc.ncsu.edu/arpit.raw