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• ffmpeg 2.8.x cross compile error on mac os x 10.10

  22 avril 2016, par alijandro

  I want to cross compile ffmpeg 2.8.x on Mac OS X 10.10, but I got the following error.

  HOSTCC  libavcodec/cabac_tablegen.o
  
  In file included from libavcodec/cabac_tablegen.c:25:
  
  In file included from libavcodec/cabac_functions.h:43:
  
  libavcodec/arm/cabac.h:96:25: error: value '24' out of range for constraint 'M'
  
            [byte]"M"(offsetof(CABACContext, bytestream)),
  
                      ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
  
  /Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/../lib/clang/7.0.2/include/stddef.h:120:24: note: 
  
    expanded from macro 'offsetof'
  
  #define offsetof(t, d) __builtin_offsetof(t, d)
  
                     ^~~~~~~~~~~~~~~~~~~~~~~~
  
  1 error generated.
  
  make: *** [libavcodec/cabac_tablegen.o] Error 1

  The error show some error in host cc, the host cc is clang-700.1.81

  $ gcc --version
  
  Configured with: --prefix=/Applications/Xcode.app/Contents/Developer/usr --with-gxx-include-dir=/usr/include/c++/4.2.1
  
  Apple LLVM version 7.0.2 (clang-700.1.81)
  
  Target: x86_64-apple-darwin14.5.0
  
  Thread model: posix

  Before I upgrade Xcode to 7.2, it worked fine.

  For ffmpeg 3.x, there is no such problem. But the ffmpeg version I need is 2.8.x. How can I fix without downgrade Xcode to previous version ?

• Include Shared library .so in android studio

  15 avril 2016, par Spartan

  I extracted ffmpeg in ndk’s source folder then compiled it there only for that I followed this :http://www.roman10.net/2013/08/18/how-to-build-ffmpeg-with-ndk-r9/ and successfully generated android folder with arm/lib and arm/include files.

  After that I created one Android.mk file in $NDK/sources/ffmpeg/android/arm and one Android.mk in my android project(src/main/jni folder).

  My src/main/jni/Android.mk is like this :

  LOCAL_PATH := $(call my-dir)
  
  
  
  include $(CLEAR_VARS)
  
  
  
  LOCAL_MODULE    := tutorial01
  
  LOCAL_SRC_FILES := tutorial01.c
  
  LOCAL_LDLIBS := -llog -ljnigraphics -lz
  
  LOCAL_SHARED_LIBRARIES := libavcodec
  
  
  
  include $(BUILD_SHARED_LIBRARY)
  
  $(call import-module,ffmpeg-3.0.1/android/arm)

  and $NDK/sources/ffmpeg/android/arm/Android.mk is :

  LOCAL_PATH:= $(call my-dir)
  
  
  
  include $(CLEAR_VARS)
  
  LOCAL_MODULE:= libavcodec
  
  LOCAL_SRC_FILES:= lib/libavcodec-57.so
  
  LOCAL_EXPORT_C_INCLUDES := $(LOCAL_PATH)/include
  
  include $(PREBUILT_SHARED_LIBRARY)

  I updated my build.gradle like this and successfully generated jniLibs with .so files but I am getting libavcodec/avcodec.h : No such file or directory while building project.

  import org.apache.tools.ant.taskdefs.condition.Os
  
  
  
  apply plugin: 'com.android.model.application'
  
  
  
  model {
  
      android {
  
          compileSdkVersion = 23
  
          buildToolsVersion = "23.0.2"
  
  
  
          defaultConfig.with {
  
              applicationId = "com.example.spartan.hello"
  
              minSdkVersion.apiLevel = 18
  
              targetSdkVersion.apiLevel = 23
  
              versionCode = 1
  
              versionName = "1.0"
  
          }
  
      }
  
      android.buildTypes {
  
          release {
  
              minifyEnabled = false
  
              proguardFiles.add(file('proguard-android.txt'))
  
          }
  
      }
  
  
  
      android.sources {
  
          main {
  
              jni {
  
                  source {
  
                      srcDirs = []
  
                  }
  
  
  
              }
  
  
  
          }
  
  
  
          main {
  
              jniLibs {
  
                  source {
  
                      srcDirs = ['src/main/libs']
  
                  }
  
              }
  
          }
  
  
  
      }
  
  
  
      android.ndk {
  
          moduleName = "tutorial01"
  
          stl = 'gnustl_shared'
  
      }
  
  }
  
  
  
  
  
  task ndkBuild(type: Exec) {
  
      if (Os.isFamily(Os.FAMILY_WINDOWS)) {
  
          commandLine 'ndk-build.cmd', '-C', file('src/main').absolutePath
  
      } else {
  
          commandLine 'ndk-build', '-C', file('src/main').absolutePath
  
      }
  
  }
  
  tasks.withType(JavaCompile) {
  
      compileTask -> compileTask.dependsOn ndkBuild
  
  }
  
  
  
  dependencies {
  
      compile fileTree(include: ['*.jar'], dir: 'libs')
  
      testCompile 'junit:junit:4.12'
  
      compile 'com.android.support:appcompat-v7:23.2.1'
  
  }

  and loading them in my activity like this :

  static {
  
          System.loadLibrary("tutorial01");     
  
          System.loadLibrary("avcodec-57");   
  
      }

  I am new to NDK so, Is it ok if we manually paste header files in jni folder ?

• Video uploaded using paperclip on heroku showing no screen, only sound

  21 avril 2016, par Tijmenh

  I’m uploading a video to a Ruby on Rails application on a Heroku server. Locally it works fine, but on the Heroku server there is no screen showing, only sound.

  The model :

  class Video < ActiveRecord::Base
  
    validates :user_id, :title, presence: true
  
  
  
    has_attached_file :file, :styles => {
  
      :poster => { :geometry => "640x480", :format => 'jpg' },
  
      :large => { :geometry => "640x480", :format => 'mp4',  }
  
    }, :use_timestamp => false, :processors => [:transcoder]
  
  
  
    validates_attachment_content_type :file, content_type: /\Avideo\/.*\Z/
  
  
  
    belongs_to :user
  
  end

  and the view to display the video :

  <video width="640" height="480" controls="controls">
  
    <source type="video/mp4">
  
      Your browser does not support the video tag.
  
  </source></video>

  Also I’m using the buildpack https://github.com/shunjikonishi/heroku-buildpack-ffmpeg besides the ruby buildpack on Heroku.

  I use the gem 'paperclip-av-transcoder'. I also tried the following gems :

  gem 'paperclip', '~> 4.3.1'
  
  gem 'aws-sdk', '< 2.0'
  
  gem 'paperclip-av-transcoder'
  
  gem "paperclip-ffmpeg", "~> 1.2.0" 

  But the same results.

  I start to think it has something to do with the transcoder used on Heroku. If you download the file the video plays fine in a video player.

  Any ideas ?