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• SDL_SetVideoMode fails under Android ?

  17 avril 2013, par user1568549

  I am trying to buid a Video Player for android using libsdl for rendering and libav for decoding.

  First, i cross-compiled the sdl library for Android platform.
  Then i ceated the jni layer for my sdl cpp file(already tested under ubuntu)
  but when i test it under Android it fails(with fatal error segv11 signal) exactly at the beginning in the following instruction :

   this->screen = SDL_SetVideoMode(width, height, 0, 0);

  Does anyone know any workaround for this error ?

  Does anyone know how to display video using sdl under android ?
  And is there any instructions or steps that i must follow in order to render SDL gui under android ?

  Thanks in advance !

• ffmpeg usage in Android Studio

  8 septembre 2017, par sargis_74

  I try to use ffmpeg sources in Android Studio under Windows10.
  I built the ffmpeg.3.3.3 under ubuntu on Virtual Box by the followinf script and integrated the sources into Android Studio project :

  #!/bin/bash
  
  NDK=/etc/FFmpegOnAndroid/android-ndk-r14b
  
  SYSROOT=$NDK/platforms/android-21/arch-x86_64
  
  TOOLCHAIN=/etc/FFmpegOnAndroid/android-ndk-r14b/toolchains/x86_64-4.9/prebuilt/linux-x86_64
  
  CPU=arm
  
  PREFIX=/etc/FFmpegOnAndroid/ffmpeg-3.3.3/output
  
  ADDI_CFLAGS="-fomit-frame-pointer"
  
  function build_one
  
  {
  
      ./configure \
  
          --prefix=$PREFIX \
  
          --enable-shared \
  
          --disable-static \
  
          --disable-doc \
  
          --disable-doc \
  
          --disable-symver \
  
          --enable-small \
  
          --cross-prefix=$TOOLCHAIN/bin/x86_64-linux-android- \
  
          --target-os=linux \
  
          --arch=x86_64 \
  
          --enable-cross-compile \
  
          --sysroot=$SYSROOT \
  
          --extra-cflags="-Os -fpic $ADDI_CFLAGS" \
  
          --extra-ldflags="$ADDI_LDFLAGS" \
  
          $ADDITIONAL_CONFIGURE_FLAG
  
      make clean
  
      make
  
      make install
  
  }
  
  build_one

  When I execute the following command under ubuntu, the output file is created without losing the quality :

  ffmpeg -i sample_2.mp4 -i ic_launcher.jpg -filter_complex [1:v]scale=70:-1[wm];[0:v][wm]overlay=W-w-10:H-h-10[out] -map 0:a? -map [out] output.mp4

  but when I call main() function of ffmpeg.c in Android studio with same arguments, the quality of output file is lost.

  Here are the difference of info of created output files :

  Android Studio :

  Stream #0:1(und): Video: mpeg4 (Simple Profile) (mp4v / 0x7634706D), yuv420p, 1200x720 [SAR 1:1 DAR 5:3], 585 kb/s, 25 fps, 25 tbr, 12800 tbn, 25 tbc (default)

  ubuntu :

  Stream #0:0(und): Video: h264 (Main) (avc1 / 0x31637661), yuv420p, 1200x720 [SAR 1:1 DAR 5:3], 423 kb/s, 25 fps, 25 tbr, 90k tbn, 50 tbc (default)

  Could you please help me to solve this problem.

  Thanks in advance,

  Sargis Boyajyan

• FFMPEG for android in Windows not successfully compile

  23 décembre 2014, par PRAKASH UBHADIYA

  I am trying to compile FFMPEG for android in Windows 8.1 but i got error at 32 line in build_android.sh

  ./build_android.sh : line 32 : syntax error : unexpected end of file

  when i execute command in cygwin

  chmod +x build_android.sh

  ./build_android.sh

  If you are knows steps to compile ffmpeg for android in windows and how to use ffmpeg in android then pleas reply me.

  I am referencing .
  http://www.packtpub.com/sites/default/files/downloads/Developing_Multimedia_Applications_with_NDK.pdf
  ,

  https://trac.ffmpeg.org/wiki/CompilationGuide/Android and

  http://www.roman10.net/how-to-build-ffmpeg-with-ndk-r9

  build_android.sh

  #!/bin/bash
  
  NDK=E:/android-ndk-r9d
  
  SYSROOT=$NDK/platforms/android-9/arch-arm/
  
  TOOLCHAIN=$NDK/toolchains/arm-linux-androideabi-4.6/prebuilt/windows
  
  function build_one { ./configure \
  
  --prefix=$PREFIX \
  
  --disable-shared \
  
  --enable-static \
  
  --disable-doc \
  
  --enable-ffmpeg \
  
  --disable-ffplay \
  
  --disable-ffprobe \
  
  --disable-ffserver \
  
  --enable-avdevice \
  
  --disable-doc \
  
  --disable-symver \
  
  --cross-prefix=$TOOLCHAIN/bin/arm-linux-androideabi- \
  
  --target-os=linux \
  
  --arch=arm \
  
  --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