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• Build FFMPEG under Cygwin in Windows OS for Android

  8 juin 2017, par Jun Kim

  For the past couple days, I have been trying hard to build FFMPEG for a Android project on Windows Operating System using android-ndk-14d using Cygwin.
  I have followed many tutorials out there, and I ahve encountered so many errors while building FFMPEG using build_android.sh.

  Here are the steps that I have taken so far.

  I downloaded Cygwin and configured all the dependencies that I need for building FFMPEG.

  I opened ffmpeg-3.3.1/configure file with a text editor, and changed to the following lines.

  SLIBNAME_WITH_MAJOR='$(SLIBPREF)$(FULLNAME)-$(LIBMAJOR)$(SLIBSUF)'
  
  LIB_INSTALL_EXTRA_CMD='$$(RANLIB) "$(LIBDIR)/$(LIBNAME)"'
  
  SLIB_INSTALL_NAME='$(SLIBNAME_WITH_MAJOR)'
  
  SLIB_INSTALL_LINKS='$(SLIBNAME)'

  my build_android.sh is as below

  #!/bin/bash
  
  NDK=C:/~/ndk-bundle
  
  SYSROOT=$NDK/platforms/android-21/arch-arm/
  
  TOOLCHAIN=$NDK/toolchains/arm-linux-androideabi-4.9/prebuilt/windows-x86_64
  
  function build_one
  
  {
  
  ./configure \
  
      --prefix=$PREFIX \
  
      --enable-shared \
  
      --disable-static \
  
      --disable-doc \
  
      --disable-ffmpeg \
  
      --disable-ffplay \
  
      --disable-ffprobe \
  
      --disable-ffserver \
  
      --disable-avdevice \
  
      --disable-doc \
  
      --disable-symver \
  
      --cross-prefix=$TOOLCHAIN/bin/arm-linux-androideabi-\
  
      --target-os=android \
  
      --arch=arm \
  
      --cpu=armv7-a \
  
      --enable-cross-compile \
  
      --sysroot=$SYSROOT \
  
      --extra-cflags="-Os -fpic $ADDI_CFLAGS" \
  
      --extra-ldflags="$ADDI_LDFLAGS" \
  
      $ADDITIONAL_CONFIGURE_FLAG
  
  make clean
  
  make
  
  make install
  
  }
  
  CPU=arm
  
  PREFIX=$(pwd)/android/$CPU
  
  ADDI_CFLAGS="-marm"
  
  build_one

  I ran these commands

  dos2unix build_android.sh 
  
  chmod +x build_android.sh
  
  ./build_android.sh

  and,,,currently getting this error

  c :/users/sonic/appdata/local/android/sdk/ndk-bundle/toolchains/arm-linux-androideabi-4.9/p
  rebuilt/windows-x86_64/bin/../lib/gcc/arm-linux-androideabi/4.9.x/../../../../arm-linux-an
  droideabi/bin/ld.exe : error : libavutil/libavutil.so:1:1 : syntax error,
  unexpected ’ !’, exp ecting $end

  c :/users/sonic/appdata/local/android/sdk/ndk-bundle/toolchains/arm-linux-androideabi-4.9/p
  rebuilt/windows-x86_64/bin/../lib/gcc/arm-linux-androideabi/4.9.x/../../../../arm-linux-an
  droideabi/bin/ld.exe : error : libavutil/libavutil.so : not an object or
  archive collect2.exe : error : ld returned 1 exit status
  make : *** [library.mak:94 : libswscale/libswscale-4.so] Error 1 LD

  libswscale/libswscale-4.so
  c :/users/sonic/appdata/local/android/sdk/ndk-bundle/toolchains/arm-linux-androideabi-4.9/p
  rebuilt/windows-x86_64/bin/../lib/gcc/arm-linux-androideabi/4.9.x/../../../../arm-linux-an
  droideabi/bin/ld.exe : error : libavutil/libavutil.so:1:1 : syntax error,
  unexpected ’ !’, exp ecting $end

  c :/users/sonic/appdata/local/android/sdk/ndk-bundle/toolchains/arm-linux-androideabi-4.9/p
  rebuilt/windows-x86_64/bin/../lib/gcc/arm-linux->androideabi/4.9.x/../../../../arm-linux-an
  droideabi/bin/ld.exe : error : libavutil/libavutil.so : not an object or
  archive collect2.exe : error : ld returned 1 exit status make : ***
  [library.mak:94 : libswscale/libswscale-4.so] Error 1

  How to compile ffmpeg-2.5.3 on windows with android-ndk-r10d

  From the comments that were commented on the above link, it seems like it is
  easier to build FFMPEG in Linux/Unix OS. My first can be a dumb question. But If there is anyone who can guide me through this, i will be really appreciated it.

  If I build FFMPEG on Linux for Android, could I possibly copy or move those
  resulted output (The arm/lib folder contains the shared libraries, while arm/include folder contains the header files for libavcodec, libavformat, libavfilter, libavutil, libswscale etc.) to Windows OS and utilize them for
  my Android project ?

  Since my company only provides Windows OS for a project, I have to utilize them on Windows OS.

  Thank you for your time, and if there is any feedback that you can provide it will definitely be helpful.

  For the reference, here is my config.log

  END c :/ffmpegtmp/ffconf.qoBF6X98.c
  C :/Users/sonic/AppData/Local/Android/sdk/ndk-bundle/toolchains/arm-linux-androideabi-4.9/prebuilt/windows-x86_64/bin/arm-linux-androideabi-gcc —sysroot=C :/Users/sonic/AppData/Local/Android/sdk/ndk-bundle/platforms/android-9/arch-arm/

  -isysroot C :/Users/sonic/AppData/Local/Android/sdk/ndk-bundle/platforms/android-9/arch-arm/
  -D_ISOC99_SOURCE -D_FILE_OFFSET_BITS=64 -D_LARGEFILE_SOURCE -Dstrtod=avpriv_strtod -DPIC -Os -fpic -marm -march=armv7-a -std=c11 -fomit-frame-pointer -fPIC -marm -pthread -g -Wdeclaration-after-statement -Wall -Wdisabled-optimization -Wpointer-arith -Wredundant-decls -Wwrite-strings -Wtype-limits -Wundef -Wmissing-prototypes -Wno-pointer-to-int-cast -Wstrict-prototypes -Wempty-body -Wno-parentheses -Wno-switch -Wno-format-zero-length -Wno-pointer-sign -O3 -fno-math-errno -fno-signed-zeros -fno-tree-vectorize -Werror=format-security -Werror=implicit-function-declaration -Werror=missing-prototypes -Werror=return-type -Werror=vla -Wformat -c -o c :/ffmpegtmp/ffconf.8joa74tC.o

  c :/ffmpegtmp/ffconf.qoBF6X98.c
  check_cflags -fdiagnostics-color=auto test_cflags
  -fdiagnostics-color=auto check_cc -fdiagnostics-color=auto BEGIN c :/ffmpegtmp/ffconf.qoBF6X98.c
  1 int x ; END c :/ffmpegtmp/ffconf.qoBF6X98.c C :/Users/sonic/AppData/Local/Android/sdk/ndk-bundle/toolchains/arm-linux-androideabi-4.9/prebuilt/windows-x86_64/bin/arm-linux-androideabi-gcc —sysroot=C :/Users/sonic/AppData/Local/Android/sdk/ndk-bundle/platforms/android-9/arch-arm/

  -isysroot C :/Users/sonic/AppData/Local/Android/sdk/ndk-bundle/platforms/android-9/arch-arm/
  -D_ISOC99_SOURCE -D_FILE_OFFSET_BITS=64 -D_LARGEFILE_SOURCE -Dstrtod=avpriv_strtod -DPIC -Os -fpic -marm -march=armv7-a -std=c11 -fomit-frame-pointer -fPIC -marm -pthread -g -Wdeclaration-after-statement -Wall -Wdisabled-optimization -Wpointer-arith -Wredundant-decls -Wwrite-strings -Wtype-limits -Wundef -Wmissing-prototypes -Wno-pointer-to-int-cast -Wstrict-prototypes -Wempty-body -Wno-parentheses -Wno-switch -Wno-format-zero-length -Wno-pointer-sign -O3 -fno-math-errno -fno-signed-zeros -fno-tree-vectorize -Werror=format-security -Werror=implicit-function-declaration -Werror=missing-prototypes -Werror=return-type -Werror=vla -Wformat -fdiagnostics-color=auto -c -o c :/ffmpegtmp/ffconf.8joa74tC.o c :/ffmpegtmp/ffconf.qoBF6X98.c test_cflags -Wmaybe-uninitialized check_cc -Wmaybe-uninitialized BEGIN

  c :/ffmpegtmp/ffconf.qoBF6X98.c
  1 int x ; END c :/ffmpegtmp/ffconf.qoBF6X98.c C :/Users/sonic/AppData/Local/Android/sdk/ndk-bundle/toolchains/arm-linux-androideabi-4.9/prebuilt/windows-x86_64/bin/arm-linux-androideabi-gcc —sysroot=C :/Users/sonic/AppData/Local/Android/sdk/ndk-bundle/platforms/android-9/arch-arm/

  -isysroot C :/Users/sonic/AppData/Local/Android/sdk/ndk-bundle/platforms/android-9/arch-arm/
  -D_ISOC99_SOURCE -D_FILE_OFFSET_BITS=64 -D_LARGEFILE_SOURCE -Dstrtod=avpriv_strtod -DPIC -Os -fpic -marm -march=armv7-a -std=c11 -fomit-frame-pointer -fPIC -marm -pthread -g -Wdeclaration-after-statement -Wall -Wdisabled-optimization -Wpointer-arith -Wredundant-decls -Wwrite-strings -Wtype-limits -Wundef -Wmissing-prototypes -Wno-pointer-to-int-cast -Wstrict-prototypes -Wempty-body -Wno-parentheses -Wno-switch -Wno-format-zero-length -Wno-pointer-sign -O3 -fno-math-errno -fno-signed-zeros -fno-tree-vectorize -Werror=format-security -Werror=implicit-function-declaration -Werror=missing-prototypes -Werror=return-type -Werror=vla -Wformat -fdiagnostics-color=auto -Wmaybe-uninitialized -c -o c :/ffmpegtmp/ffconf.8joa74tC.o c :/ffmpegtmp/ffconf.qoBF6X98.c

• Uploading videos on rails website

  16 mai 2017, par Dinukaperera

  I am trying to let my users upload videos on my website(not deployed yet, testing locally). I have it set up in a manner where if the "user information" gets saved, it will take them to the "root_path", which is the homepage. If the user information is not saved, it will render the form again. Before I added the video upload feature, all the information got saved and everything worked well, but after adding the feature, it keeps rendering the same form over and over again since the information is not getting saved. How do I check what’s wrong ? The command line gives me this error :

  The user information form partial :
  `

  <%= simple_form_for @userinfo do |f| %>
  
    <%= f.input :name, label: 'Full name', error: 'Full name is mandatory' %>
  
    <%= f.input :username, label: 'Username', error: 'Username is mandatory, please specify one' %>
  
    <%= f.input :school, label: 'Name of college' %>
  
    <%= f.input :gpa, label: 'Enter GPA' %>
  
    <%= f.input :email, label: 'Enter email address' %>
  
    <%= f.input :number, label: 'Phone number' %>
  
    <%= f.file_field :video %>
  
    <%= f.button :submit %>
  
  <% end %>

  `

  My user controller (This is the user information controller, does not control user email and password. I’m using the devise gem for user sign in, sign out, and sign up) :`

  class UsersController < ApplicationController
  
      def index
  
      end
  
  
  
      def show
  
      end
  
  
  
      def new
  
          @userinfo = User.new
  
      end
  
  
  
      def create
  
          @userinfo = User.new(user_params)
  
          if @userinfo.save
  
            redirect_to root_path
  
          else
  
            render 'new'
  
          end
  
      end
  
  
  
      def edit
  
      end
  
  
  
      def update
  
      end
  
  
  
      def destroy
  
      end
  
  
  
      private
  
          def user_params
  
              params.require(:user).permit(:name, :username, :email, :number, :school, :gpa, :major, :video)
  
          end
  
  end

  `

  This is the user model (usermain is the model related to user password and email. The user information in the user model belongs to the usermain) : `

  class User < ActiveRecord::Base
  
      belongs_to :usermain
  
  
  
      has_attached_file :video, styles: {:video_show => {:geometry => "640x480",:format => 'mp4'},:video_index => { :geometry => "160x120", :format => 'jpeg', :time => 10}}, :processors => [:transcoder]
  
      validates_attachment_content_type :video, content_type: /\Avideo\/.*\Z/
  
  end

  `

  This is the migration file that creates the user information table :`

  class CreateUsers < ActiveRecord::Migration
  
    def change
  
      create_table :users do |t|
  
        t.string :name
  
        t.string :username
  
        t.string :email
  
        t.string :number
  
        t.string :school
  
        t.string :gpa
  
        t.string :major
  
  
  
        t.timestamps null: false
  
      end
  
    end
  
  end

  This is adding the "video" field to the above created user information table:

  class AddAttachmentVideoToUsers < ActiveRecord::Migration
  
    def self.up
  
      change_table :users do |t|
  
        t.attachment :video
  
      end
  
    end
  
  
  
    def self.down
  
      remove_attachment :users, :video
  
    end
  
  end

  `

  I also have paperclip and ffmpeg installed. When I say installed, it’s literally just that. I’m not sure if I have to manipulate paperclip or ffmpeg in any way to make it work with the videos, I have just installed and did nothing else with them. I have been pulling my hair out for the past two days. Any help is appreciated.

• java.lang.NoClassDefFoundError : Could not initialize class on Linux (Works fine on Windows)

  26 décembre 2016, par Jake Miller

  I’m using a C++ FFmpeg wrapper for Java (org.bytedeco.javacpp). This works perfectly on a Windows machine (my development machine) but throws this error when ran on Linux (Amazon Web Services Elastic Beanstalk) :

  java.lang.NoClassDefFoundError: Could not initialize class org.bytedeco.javacpp.avutil
  
      at java.lang.Class.forName0(Native Method) ~[na:1.8.0_111]
  
      at java.lang.Class.forName(Class.java:348) ~[na:1.8.0_111]
  
      at org.bytedeco.javacpp.Loader.load(Loader.java:472) ~[javacpp-1.2.1.jar!/:1.2.1]
  
      at org.bytedeco.javacpp.Loader.load(Loader.java:417) ~[javacpp-1.2.1.jar!/:1.2.1]
  
      at org.bytedeco.javacpp.avformat$AVFormatContext.<clinit>(avformat.java:2819) ~[ffmpeg-3.2.1-1.3.jar!/:1.2.1]
  
      at org.bytedeco.javacv.FFmpegFrameGrabber.startUnsafe(FFmpegFrameGrabber.java:391) ~[javacv-1.3.jar!/:1.3]
  
      at org.bytedeco.javacv.FFmpegFrameGrabber.start(FFmpegFrameGrabber.java:385) ~[javacv-1.3.jar!/:1.3]
  
  </clinit>

  I’ve been troubleshooting for the past 2 days and have tried the following to fix the issue :

  • upgrade to Linux to 2.4
  • downgrading javacpp to 1.2.1
  • running mvn clean
  • running mvn -U
  • deleting contents of /.m2/ and redownloading dependencies
  • various combinations of dependency versions
  • git clone on a Linux VM & running mvn install there

  When looking further into the issue, I stumbled upon documentation for avformat$AVFormatContext as it’s in the stack trace posted above (6th line). The documentation for a C++ class named AVFormatContext. Whenever I attempt to view the class in Eclipse, it says Source Not Found.

  My question : could this problem possibly be caused by the C++ libraries on my Linux VM ? None of the above solutions fixed it so this is my only hypothesis as of now.

  Here’s my other Stack Overflow question regarding this subject : Java.lang.NoClassDefFoundError caused by FFmpeg when deployed on Linux as a packaged .war (Works on development machine)