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• Track format difference when importing BMP file into quicktime .mov file

  23 juillet 2015, par Neal Davis

  I am creating a quicktime container .mov file from one BMP file in two ways :

  1. Using the quicktime COM object API for .NET C# under windows
  2. Using ffmpeg command line (rawvideo codec)

  Both resulting .MOV files open with Quicktime Player Pro just fine and look identical to my eyes, also they are either the same size as the original BMP or larger.

  However, when viewing the track properties under QT Player PRO, they show :

  1. track format = BMP.
  2. track format = NONE.

  Is there likely a difference since in 1. above I do not set a track properties format ? In other words, is there likely any changes being made to the BMP bits in number 1 above (like compression, or alpha, or ???) ?

• 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 !

• Metadata is not showing ffmpeg C++

  18 août 2015, par Kaidul Islam

  I am muxing h264 encoded video data and PCM g711 encoded audio data into a .mov media container. I am trying to write metadata on header but the metadata is not showing when I go to file->right click->properties->details on windows and likewise in Ubuntu. This is my code -

  // Instead of creating new AVDictionary object, I also tried following way
  
  // stated here: http://stackoverflow.com/questions/17024192/how-to-set-header-metadata-to-encoded-video 
  
  // but no luck
  
  AVDictionary* pMetaData = m_pFormatCtx->metadata;
  
  av_dict_set(&pMetaData, "title", "Cloud Recording", 0);
  
  av_dict_set(&pMetaData, "artist", "Foobar", 0);
  
  av_dict_set(&pMetaData, "copyright", "Foobar", 0);
  
  av_dict_set(&pMetaData, "filename", m_sFilename.c_str(), 0);
  
  time_t now = time(0);
  
  struct tm tStruct = *localtime(&now);
  
  char date[100];
  
  strftime(date, sizeof(date), "%c", &tStruct); // i.e. Thu Aug 23 14:55:02 2001
  
  av_dict_set(&pMetaData, "date", date, 0);
  
  av_dict_set(&pMetaData, "creation_time", date, 0);
  
  av_dict_set(&pMetaData, "comment", "This video has been created using Eyeball MSDK", 0);
  
  
  
  // ....................
  
  // .................
  
  
  
  /* write the stream header, if any */
  
  int ret = avformat_write_header(m_pFormatCtx, &pMetaData);

  I also tried to see if the file contains any metadata using mediainfo and exiftools in linux. Also I tried ffmpeg -i output.mov but no metadata is shown.

  Whats the problem ? Is the flags value 0 in av_dict_set okay ? DO I need to set different flags for different platform (windows/linux) ?

  I saw this link and it stated that for windows, I have to use id3v2_version 3 and -write_id3v1 1 to make metadata working. If so, how can I do this in C++ ?