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• Adding ffmpeg library to Python Kivy App and Buildozer for Android

  15 août 2023, par Chris-Yoon

  I am working on a Python Kivy App, in which I have to manipulate audio files such as joining audio files or converting them into aac format. In order to achieve this I use the ffmpeg library. Everything works fine on my Linux machine, however, I couldn't make it run on the Android device. I build my apk/aab file by using Buildozer. I built a variety of cross-platform apps for Windows or Linux or for the web, but I am not really an experienced Android developer.

  


  Can someone give me a high-level explanation or even a detailed description on how I can add this third party library to the apk/aab file and define it as environment variable using buildozer, so that other modules such as ffmpeg-python or pydub can find it ? I am also open to alternatives if there are any.

  


  I tried ffmpegkit, adding prebuilt libraries, defining the path to the converter in PyDub.

  


• Android ffmpeg with opus support

  6 décembre 2014, par ademar111190

  I’m following this tutorial, with some changes, i want add the opus support, I think adding the option --enable-libopus is all i need but no, when I try compile with the shell as follow I’m getting the error :

  configure.sh

  #!/bin/bash
  
  
  
  export ANDROID_NDK=/home/ademar/android-ndk-r9
  
  export TOOLCHAIN=$(pwd)/temp/ffmpeg
  
  export SYSROOT=$TOOLCHAIN/sysroot/
  
  $ANDROID_NDK/build/tools/make-standalone-toolchain.sh --platform=android-9 --toolchain=arm-linux-androideabi-4.8 --install-dir=$TOOLCHAIN
  
  
  
  export PATH=$TOOLCHAIN/bin:$PATH
  
  export CC=arm-linux-androideabi-gcc
  
  export LD=arm-linux-androideabi-ld
  
  export AR=arm-linux-androideabi-ar
  
  
  
  CFLAGS="-O3 -Wall -mthumb -pipe -fpic -fasm \
  
    -finline-limit=300 -ffast-math \
  
    -fstrict-aliasing -Werror=strict-aliasing \
  
    -fmodulo-sched -fmodulo-sched-allow-regmoves \
  
    -Wno-psabi -Wa,--noexecstack \
  
    -D__ARM_ARCH_5__ -D__ARM_ARCH_5E__ \
  
    -D__ARM_ARCH_5T__ -D__ARM_ARCH_5TE__ \
  
    -DANDROID -DNDEBUG"
  
  
  
  EXTRA_CFLAGS="-march=armv7-a -mfpu=neon -mfloat-abi=softfp -mvectorize-with-neon-quad"
  
  EXTRA_LDFLAGS="-Wl,--fix-cortex-a8"
  
  
  
  FFMPEG_FLAGS="--prefix=/tmp/ffmpeg/build \
  
    --target-os=linux \
  
    --arch=arm \
  
    --enable-cross-compile \
  
    --cross-prefix=arm-linux-androideabi- \
  
    --enable-shared \
  
    --disable-symver \
  
    --disable-doc \
  
    --disable-ffplay \
  
    --disable-ffmpeg \
  
    --disable-ffprobe \
  
    --disable-ffserver \
  
    --disable-avdevice \
  
    --disable-avfilter \
  
    --disable-encoders  \
  
    --disable-muxers \
  
    --disable-filters \
  
    --disable-devices \
  
    --disable-everything \
  
    --enable-protocols  \
  
    --enable-parsers \
  
    --enable-demuxers \
  
    --disable-demuxer=sbg \
  
    --enable-decoders \
  
    --enable-bsfs \
  
    --disable-network \
  
    --enable-swscale  \
  
    --enable-asm \
  
    --enable-libopus \
  
    --enable-libtheora \
  
    --enable-libvorbis \
  
    --enable-nonfree \
  
    --enable-version3"
  
  
  
  cd ffmpeg
  
  ./configure $FFMPEG_FLAGS --extra-cflags="$CFLAGS $EXTRA_CFLAGS" --extra-ldflags="$EXTRA_LDFLAGS"

  the error :

  ERROR: opus not found
  
  
  
  If you think configure made a mistake, make sure you are using the latest version from Git. If the latest version fails, report the problem to the ffmpeg-user@ffmpeg.org mailing list or IRC #ffmpeg on irc.freenode.net. Include the log file "config.log" produced by configure as this will help solving the problem.

  if want i can post the config.log content, but it is big.

  on folder ffmpeg I have a git clone from source.ffmpeg.org on branch release/1.2

• C flags which gives priority to quality for decoded images in ffmpeg

  18 janvier 2016, par Tank2005

  I’m trying to decode h.264 streaming with ffmpeg(latest version) on Android NDK.

  I succeeded to get a decoded frame. But, an aquired image is very dirty even if low latency flag is disabled.

  If I want to give priority to quality over decoding speed, which flags should I specify ?

  bool initCodec(bool low_latency)
  
  {
  
      av_register_all();
  
  
  
      codec = avcodec_find_decoder(AV_CODEC_ID_H264);
  
      if(!codec) return false;
  
  
  
      context = avcodec_alloc_context3(codec);
  
      if(!context) return false;
  
  
  
      if(codec->capabilities & CODEC_CAP_TRUNCATED) context->flags |= CODEC_FLAG_TRUNCATED;
  
      if(low_latency == true) context->flags |= CODEC_FLAG_LOW_DELAY;
  
  
  
      frame = av_frame_alloc();
  
  
  
      int res = avcodec_open2(context, codec, NULL);
  
      if (res < 0) {
  
          qDebug() << "Coundn't open codec :" << res;
  
          return false;
  
      }
  
  
  
      av_init_packet(&avpkt);
  
      return true;
  
  }
  
  
  
  void sendBytes(unsigned char *buf, int buflen)
  
  {
  
      avpkt.size = buflen;
  
      avpkt.data = buf;
  
  
  
      int got_frame, len;
  
      while (avpkt.size > 0) {
  
          len = avcodec_decode_video2(context, frame, &got_frame, &avpkt);
  
          if (len < 0) {
  
              qDebug() << "Error while decoding : " << len;
  
              break;
  
          }
  
          if (got_frame) {
  
              onGotFrame(frame);
  
          }
  
          avpkt.size -= len;
  
          avpkt.data += len;
  
      }
  
  }

  

  Ex : I heard that it made a problem while compiling the library. So I write a compile option here(I built it on OpenSUSE Linux).

  #!/bin/bash
  
  NDK=/home/ndk
  
  SYSROOT=$NDK/platforms/android-9/arch-arm/
  
  TOOLCHAIN=$NDK/toolchains/arm-linux-androideabi-4.9/prebuilt/linux-x86_64
  
  function build_one
  
  {
  
  ./configure \
  
  --prefix=$PREFIX \
  
  --enable-shared \
  
  --disable-static \
  
  --disable-avdevice \
  
  --disable-doc \
  
  --disable-symver \
  
  --disable-encoders \
  
  --disable-decoders \
  
  --enable-decoder=h264 \
  
  --enable-decoder=aac \
  
  --disable-protocols \
  
  --disable-demuxers \
  
  --disable-muxers \
  
  --disable-filters \
  
  --disable-network \
  
  --disable-parsers \
  
  --cross-prefix=$TOOLCHAIN/bin/arm-linux-androideabi- \
  
  --target-os=linux \
  
  --arch=arm \
  
  --enable-asm --enable-yasm \
  
  --enable-cross-compile \
  
  --sysroot=$SYSROOT \
  
  --extra-cflags="-Os -marm -march=armv7-a -mfloat-abi=softfp -mfpu=neon" \
  
  --extra-ldflags="-Wl,--fix-cortex-a8" \
  
  $ADDITIONAL_CONFIGURE_FLAG
  
  make clean
  
  make
  
  make install
  
  }
  
  CPU=armv7-a
  
  PREFIX=$(pwd)/android/$CPU
  
  build_on