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• how to configure ffmpeg for android on windows ?

  26 octobre 2023, par charlieChen

  I have download android-ndk-r20b，ffmpeg on win10 desktop, and msys2 environment to configure the ffmpeg, i have a script file to compile ffmpeg named "ffmpeg.sh" :

  


  #!/bin/bash
BASEDIR=$(pwd)
TOOLCHAIN_PREFIX=/d/softwareToInstall/NDK/android-ndk-r20b/toolchains/llvm/prebuilt/windows/bin
CFLAGS='-U_FORTIFY_SOURCE -D_FORTIFY_SOURCE=2 -fno-strict-overflow -fstack-protector-all'
LDFLAGS='-Wl,-z,relro -Wl,-z,now -pie'

./configure \
--target-os=android \
--prefix=../installationForAndroid \
--cross-prefix=$TOOLCHAIN_PREFIX/  \
--cc=$TOOLCHAIN_PREFIX/armv7a-linux-androideabi24-clang \
--cxx=$TOOLCHAIN_PREFIX/armv7a-linux-androideabi24-clang++ \
--ld=$TOOLCHAIN_PREFIX/arm-linux-androideabi-ld \
--nm=$TOOLCHAIN_PREFIX/arm-linux-androideabi-nm \
--arch=armv7a \
--enable-runtime-cpudetect \
--sysroot=/d/softwareToInstall/NDK/android-ndk-r20b/toolchains/llvm/prebuilt/windows/sysroot  \
--enable-pic \
--enable-pthreads \
--enable-cross-compile \
--disable-debug \
--enable-version3 \
--enable-hardcoded-tables \
--disable-ffplay \
--disable-ffprobe \
--disable-pthreads \
--enable-gpl \
--disable-x86asm \
--enable-yasm \
--disable-doc \
--disable-shared \
--enable-static 


  


  the i build ffmpeg with those commands :

  


  $ cd ffmpeg-6.0
$ ./ffmpeg.sh
...
$make -j4
$ make -j4


  


  than it report errors :

  


  enter image description here

  


  how to configure it ? i want compile ffmpeg for android on window10

  


• How to build FFmpeg Executable binary for Android on Mac OS ?

  26 août 2016, par TOP

  I’m a new beginner with FFmpeg. All I need is FFmpeg executable binary for Android. I followed the great tutorial from roman10.net

  Here is my build_android.sh file :

      #!/bin/bash
  
  NDK=/Users/sunshine/Documents/android-ndk-r11-linux-x86_64
  
  SYSROOT=$NDK/platforms/android-21/arch-arm/
  
  TOOLCHAIN=$NDK/toolchains/arm-linux-androideabi-4.9/prebuilt/linux-x86_64
  
  function build_one
  
  {
  
  ./configure \
  
      --prefix=$PREFIX \
  
      --enable-shared \
  
      --enable-static \
  
      --disable-doc \
  
      --disable-ffplay \
  
      --disable-ffprobe \
  
      --disable-ffserver \
  
      --enable-libmp3lame\
  
      --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

  The tutorial says :

  Once it’s done, you should be able to find a folder
  $NDK/sources/ffmpeg-2.0.1/android

  In my case, the build process is done, but I don’t see any android folder. Some new files are created in the same folder with build_android.sh file. Where is my mistake ?

• ffmpeg flip horizontally webcam to virtual video camera

  30 mai 2023, par Kaiser Schwarcz

  I need to horizontally flip my webcam image for a meeting.
I tried the instructions in this site https://wiki.archlinux.org/index.php/Webcam_setup#Applications which uses v4l2 and v4l2loopback to generate a virtual camera.

  


  # modprobe v4l2loopback


  


  Check the name of the newly created camera :

  


  $ v4l2-ctl --list-devices

Dummy video device (0x0000) (platform:v4l2loopback-000):
       /dev/video1


  


  Then you can run ffmpeg to read from your actual webcam (here /dev/video0) and invert it and feed it to the virtual camera :

  


  $ ffmpeg -f v4l2 -i /dev/video0 -vf "vflip" -f v4l2 /dev/video1


  


  You can use the "Dummy" camera in your applications instead of the "Integrated" camera.

  


  With these settings I was successful in vertically flipping my video. But that is not what I want. I want it to be flipped horizontally.

  


  So I tried this :

  


  $ ffmpeg -f v4l2 -i /dev/video0 -vf **"hflip"** -f v4l2 /dev/video1


  


  But I then I get no image from my cam.

  


  What am I doing wrong ?

  


  I'm using Fedora 31 in a desktop.

  


  COMPLETE LOG :

  


  ffmpeg version 4.2.2 Copyright (c) 2000-2019 the FFmpeg developers

  built with gcc 9 (GCC)

  configuration: --prefix=/usr --bindir=/usr/bin --datadir=/usr/share/ffmpeg --docdir=/usr/share/doc/ffmpeg --incdir=/usr/include/ffmpeg --libdir=/usr/lib64 --mandir=/usr/share/man --arch=x86_64 --optflags='-O2 -g -pipe -Wall -Werror=format-security -Wp,-D_FORTIFY_SOURCE=2 -Wp,-D_GLIBCXX_ASSERTIONS -fexceptions -fstack-protector-strong -grecord-gcc-switches -specs=/usr/lib/rpm/redhat/redhat-hardened-cc1 -specs=/usr/lib/rpm/redhat/redhat-annobin-cc1 -m64 -mtune=generic -fasynchronous-unwind-tables -fstack-clash-protection -fcf-protection' --extra-ldflags='-Wl,-z,relro -Wl,--as-needed -Wl,-z,now -specs=/usr/lib/rpm/redhat/redhat-hardened-ld ' --extra-cflags=' ' --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libvo-amrwbenc --enable-version3 --enable-bzlib --disable-crystalhd --enable-fontconfig --enable-frei0r --enable-gcrypt --enable-gnutls --enable-ladspa --enable-libaom --enable-libdav1d --enable-libass --enable-libbluray --enable-libcdio --enable-libdrm --enable-libjack --enable-libfreetype --enable-libfribidi --enable-libgsm --enable-libmp3lame --enable-nvenc --enable-openal --enable-opencl --enable-opengl --enable-libopenjpeg --enable-libopus --enable-libpulse --enable-librsvg --enable-libsrt --enable-libsoxr --enable-libspeex --enable-libssh --enable-libtheora --enable-libvorbis --enable-libv4l2 --enable-libvidstab --enable-libvmaf --enable-libvpx --enable-libx264 --enable-libx265 --enable-libxvid --enable-libzimg --enable-libzvbi --enable-avfilter --enable-avresample --enable-postproc --enable-pthreads --disable-static --enable-shared --enable-gpl --disable-debug --disable-stripping --shlibdir=/usr/lib64 --enable-libmfx --enable-runtime-cpudetect

  libavutil      56. 31.100 / 56. 31.100

  libavcodec     58. 54.100 / 58. 54.100

  libavformat    58. 29.100 / 58. 29.100

  libavdevice    58.  8.100 / 58.  8.100

  libavfilter     7. 57.100 /  7. 57.100

  libavresample   4.  0.  0 /  4.  0.  0

  libswscale      5.  5.100 /  5.  5.100

  libswresample   3.  5.100 /  3.  5.100

  libpostproc    55.  5.100 / 55.  5.100

Input #0, video4linux2,v4l2, from '/dev/video0':

  Duration: N/A, start: 233168.222502, bitrate: 147456 kb/s

    Stream #0:0: Video: rawvideo (YUY2 / 0x32595559), yuyv422, 640x480, 147456 kb/s, 30 fps, 30 tbr, 1000k tbn, 1000k tbc

Stream mapping:

  Stream #0:0 -> #0:0 (rawvideo (native) -> rawvideo (native))

Press [q] to stop, [?] for help

Output #0, video4linux2,v4l2, to '/dev/video2':

  Metadata:

    encoder         : Lavf58.29.100

    Stream #0:0: Video: rawvideo (Y42B / 0x42323459), yuv422p, 640x480, q=2-31, 147456 kb/s, 30 fps, 30 tbn, 30 tbc

    Metadata:

    encoder         : Lavc58.54.100 rawvideo

frame=   31 fps=0.0 q=-0.0 size=N/A time=00:00:01.03 bitrate=N/A dup=16 drop=0 sframe=   46 fps= 46 q=-0.0 size=N/A time=00:00:01.53 bitrate=N/A dup=16 drop=0 sframe=   61 fps= 40 q=-0.0 size=N/A time=00:00:02.03 bitrate=N/A .....