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• undefined reference to 'main' in Android.mk file with NDK

  25 juillet 2015, par Laurent Gorse

  I’m trying to recompile a native ffmpeg (with rtmp) library with PIE for Android 5.0 compatibility.

  The library works fine without -pie, but when I try to recompile it with the following flags :

  LOCAL_CFLAGS += -fPIE
  
  LOCAL_LDFLAGS += -fPIE -pie

  the following error gets thrown :

  /Users/lgorse/Android_Libraries/android-ndk-r10e/platforms/android-21/arch-arm/usr/lib/crtbegin_dynamic.o:crtbrand.c:function _start: error: undefined reference to 'main'
  
  Error:error: ld returned 1 exit status
  
  make: *** [obj/local/armeabi/libffmpegbridge.so] Error 1
  
  make: Leaving directory `/Users/lgorse/Android_Libraries/ffmpegbridge/app/src/main'
  
  :app:ndkBuild FAILED
  
  Error:Execution failed for task ':app:ndkBuild'.
  
  > Process 'command '/Users/lgorse/Android_Libraries/android-ndk-r10e/ndk-build'' finished with non-zero exit value 2

  It seems that the ndk-build is trying to access a .main method from within crtbegin_dynamic. Those files are built-in with the NDK so I assume there’s nothing fundamentally wrong with them, and I’m attempting to run my configuration in the wrong way.

  Here is the Android.mk file :

  LOCAL_PATH := $(call my-dir)
  
  
  
  include $(CLEAR_VARS)
  
  
  
  LOCAL_MODULE := ffmpegbridge
  
  LOCAL_SRC_FILES := ffmpegbridge.c ffmpegbridge_context.c logdump.c
  
  LOCAL_CFLAGS := -I$(LOCAL_PATH)/include -I$(LOCAL_PATH)/../prebuilt/include
  
  LOCAL_CFLAGS += -fPIE
  
  LOCAL_LDFLAGS += -fPIE -pie
  
  LOCAL_LDLIBS += -llog
  
  LOCAL_LDLIBS += -L$(LOCAL_PATH)/../prebuilt/lib
  
  LOCAL_LDLIBS += -lcrypto -lssl -lrtmp-1 -lavcodec-56 -lavdevice-56 -lavfilter-5 -lavformat-56 -lavutil-54 -lswresample-1 -lswscale-3
  
  
  
  include $(BUILD_SHARED_LIBRARY)

  Here is my Gradle file (it contains the build instructions for ndkBuild) :

  apply plugin: 'android'
  
  
  
  android {
  
      compileSdkVersion 19
  
      buildToolsVersion "19.1.0"
  
  
  
      defaultConfig {
  
          applicationId "io.cine.ffmpegbridge"
  
          minSdkVersion 18
  
          targetSdkVersion 19
  
          versionCode 1
  
          versionName "1.0"
  
      }
  
  
  
      buildTypes {
  
          release {
  
              minifyEnabled false
  
              proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
  
          }
  
      }
  
      sourceSets.main {
  
          jniLibs.srcDir 'src/main/libs'
  
          jni.srcDirs = [] // disable NDK-auto-build
  
      }
  
  
  
      Properties properties = new Properties()
  
      properties.load(project.rootProject.file('local.properties').newDataInputStream())
  
  
  
      task ndkBuild(type: Exec) {
  
          def ndkDir = properties.getProperty('ndk.dir')
  
          commandLine "$ndkDir/ndk-build", '-C', file('src/main').absolutePath
  
      }
  
  
  
      task cleanNdkBuild(type: Exec) {
  
          def ndkDir = properties.getProperty('ndk.dir')
  
          commandLine "$ndkDir/ndk-build", '-C', file('src/main').absolutePath, "clean"
  
      }
  
  
  
      tasks.withType(JavaCompile) { compileTask -> compileTask.dependsOn ndkBuild }
  
      clean.dependsOn cleanNdkBuild
  
  }
  
  
  
  dependencies {
  
      compile fileTree(dir: 'libs', include: ['*.jar'])
  
  }

  I’ll be watching this question closely so feel free to ask for follow-ups. I’m definitely around !

• Not able to change H264 profile to High from Main using FFMPEG API

  7 juin 2015, par AsG

  I am using QtFFMPEG wrapper(https://code.google.com/p/qtffmpegwrapper/) with Qt 5.4 and MSCV 2012. I want to encode a mp4 video from image files at 25 fps and high profile.
  I used the createFile() and encodeImage() functions from here

  I am using the below parameters :

  pCodecCtx=pVideoStream->codec;
  
  pCodecCtx->codec_id = pOutputFormat->video_codec;
  
  pCodecCtx->codec_type = ffmpeg::AVMEDIA_TYPE_VIDEO;
  
  pCodecCtx->profile=FF_PROFILE_H264_HIGH;
  
  pCodecCtx->bit_rate = Bitrate;
  
  pCodecCtx->width = getWidth();
  
  pCodecCtx->height = getHeight();
  
  pCodecCtx->time_base.den = fps;
  
  pCodecCtx->time_base.num = 1;
  
  pCodecCtx->gop_size = 10;
  
  pCodecCtx->pix_fmt = ffmpeg::PIX_FMT_YUV420P;
  
  pCodecCtx->qmin = 10;
  
  pCodecCtx->qmax = 51;

  The FFMPEG variables are :

  License: %s
  
   GPL version 3 or later
  
  AVCodec version %d
  
   3476480
  
  AVFormat configuration: %s
  
   --disable-static --enable-shared --enable-gpl --enable-version3 --enable-runtime-cpudetect --enable-avisynth --enable-bzlib --enable-frei0r --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libfreetype --enable-libgsm --enable-libmp3lame --enable-libopenjpeg --enable-librtmp --enable-libschroedinger --enable-libspeex --enable-libtheora --enable-libvo-aacenc --enable-libvo-amrwbenc --enable-libvorbis --enable-libvpx --enable-libx264 --enable-libxavs --enable-libxvid --enable-zlib

  Now I currently get a video with below properties :

  ID                             : 1
  
  Format                         : AVC
  
  Format/Info                    : Advanced Video Codec
  
  Format profile                 : Main@L3.2
  
  Format settings, CABAC         : No
  
  Format settings, ReFrames      : 1 frame
  
  Format settings, GOP           : M=1, N=10
  
  Codec ID                       : avc1
  
  Codec ID/Info                  : Advanced Video Coding
  
  Duration                       : 4s 320ms

  I want the profile to be "High" and the CABAC to be yes with 3 ReFrames. How do I achieve that ? I tried setting the profile, coder_type and max_b_frames but did not help. At times the generated file did not even play. Can anyone help please. Thanks.

  I also tried using the av_opt_set() way but could not find that function. Only function I have is av_opt_set_dict(), am I missing something - outdated FFMPEG or missing #include.

  Tried this too, didnt help-

     ffmpeg::AVDictionary *opt = NULL;
  
     int iRes = av_dict_set(&opt, "profile", "high", 0);
  
     av_opt_set_dict(pFormatCtx->priv_data, &opt);
  
     av_opt_set_dict(pFormatCtx, &opt);

  Please help.

  EDIT :
  I got a high quality mp4 by changing the qmin and qmax values and then reencoding the big sized output via command line. I will try to upgrade the FFMPEG as suggested by Ronald below. Please consider the question closed for now.

• hqx : Store shareable data in main decoder context

  9 avril 2015, par Vittorio Giovara

  hqx : Store shareable data in main decoder context
  In preparation for multithreaded decoding.
  

  • [DH] libavcodec/hqx.c
  • [DH] libavcodec/hqx.h