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• How to access an image file using FFmpeg in a React Native (Android) project ?

  9 septembre 2021, par Asp1re

  I made an app where I want to create a video from a png using FFmpeg in React Native but I'm stuck at my image file path part. FFmpeg uses the file system of the android so I can't really use paths like ./assets/img.png. I need an absolute path - can't use require('img.png')

  


  Here is my FFmpeg code :

  


  ffmpeg -loop 1 -i img.png -t 10 -r 1 -c:v libx264 output.mp4


  


  How can I reach the res or assets folder on an android ? Is there a way to bundle it into my app so on my android I can access it through an absolute path somehow ?

  


  I searched a lot of questions similar to this and most of the answers are the use of require('img.png') but this doesn't work for me because the way FFmpeg works. Is there a way to access my image file with FFmpeg in a React Native Android project ?

  


• Use guardian project FFMpeg on Android [on hold]

  16 juin 2014, par Sayaki

  I’m successfully build FFMpeg using guardianproject now I have single ffmpeg binary. Can you tell me how can I use it because there is no information about it ?

• Why does ffmpeg cmake external project is not working

  24 mars 2019, par bottega

  I’m trying to compile ffmpeg with h264 support as an external cmake project. But after compile it, I’m getting libavcodec reference errors.

  The compile problem is occurring on Ubuntu 18.04 machine. I have installed all dependencies for ffmpeg and also libx264-dev.

  Cmake external project

  set( proj ffmpeg )
  
  set( SHARED_FFMPEG )
  
  
  
  
  
  set(BASIC
  
          --extra-ldflags=-L/usr/local/lib
  
          --extra-cflags=-I/usr/local/include
  
          --enable-gpl
  
          --enable-libx264)
  
  
  
  
  
  option( FFMPEG_GPL "Use a GPL version of FFMPEG" OFF )
  
  
  
  set(FFMPEG_INSTALL_DIR  ${CMAKE_BINARY_DIR}/INSTALL )
  
  
  
  ExternalProject_Add(${proj}
  
          # Set up dirs
  
          SOURCE_DIR ${CMAKE_BINARY_DIR}/${proj}
  
          INSTALL_DIR ${FFMPEG_INSTALL_DIR}
  
          # get the project
  
          GIT_REPOSITORY "https://github.com/FFmpeg/FFmpeg.git"
  
          GIT_TAG "n3.2.13"
  
  
  
          # Build the project
  
          BUILD_IN_SOURCE 1
  
  
  
          # Configure step
  
          # DO STH FOR THE ARCHITECTURE...
  
          CONFIGURE_COMMAND /configure --prefix=${FFMPEG_INSTALL_DIR} ${SHARED_FFMPEG} ${FFMPEG_GPL_FLAG} ${BASIC}
  
  
  
          #  BUILD_COMMAND ${CMAKE_MAKE_PROGRAM} -j${NProcessors}
  
          )
  
  
  
  # define the library suffix
  
  if( SUPER_SHARED_LIBS )
  
      if( APPLE )
  
          set(LIBRARY_SUFFIX .dylib)
  
      else( APPLE )
  
          set(LIBRARY_SUFFIX .so)
  
      endif( APPLE )
  
  else( SUPER_SHARED_LIBS )
  
      set(LIBRARY_SUFFIX .a)
  
  endif( SUPER_SHARED_LIBS )
  
  
  
  # ADD DIRECTORIES FOR DEPENDENCIES IN Main/CMakeLists.txt
  
  set( FFMPEG_LIBRARYS libavcodec.a
  
          libavformat.a
  
          libavutil.a
  
          libswscale.a
  
          )
  
  
  
  include_directories(${FFMPEG_INSTALL_DIR}/include)
  
  
  
  set(FFMPEG_LIBRARY_DIRS ${FFMPEG_INSTALL_DIR}/lib/)
  
  link_directories(${FFMPEG_LIBRARY_DIRS})

  C++ Where I used the library

  extern "C" {
  
  #include 
  
  #include 
  
  #include 
  
  
  
  #include "libavcodec/avcodec.h"
  
  #include "libavformat/avformat.h"
  
  #include "libavutil/mathematics.h"
  
  #include "libswscale/swscale.h"
  
  
  
  #define INBUF_SIZE 4096
  
  #define AUDIO_INBUF_SIZE 20480
  
  #define AUDIO_REFILL_THRESH 4096
  
  }
  
  
  
  ...
  
  
  
   fReceiveBuffer = new u_int8_t[DUMMY_SINK_RECEIVE_BUFFER_SIZE];
  
      fReceiveBufferAV = new u_int8_t[DUMMY_SINK_RECEIVE_BUFFER_SIZE+4];
  
      fReceiveBufferAV[0] = 0;
  
      fReceiveBufferAV[1] = 0;
  
      fReceiveBufferAV[2] = 0;
  
      fReceiveBufferAV[3] = 1;
  
  
  
  
  
      av_init_packet(&avpkt);
  
      avpkt.flags |= AV_PKT_FLAG_KEY;
  
      avpkt.pts = avpkt.dts = 0;
  
  
  
      av_init_packet(&avpkt);
  
      avpkt.flags |= AV_PKT_FLAG_KEY;
  
      avpkt.pts = avpkt.dts = 0;
  
  
  
      /* set end of buffer to 0 (this ensures that no overreading happens for damaged mpeg streams) */
  
      memset(inbuf + INBUF_SIZE, 0, FF_INPUT_BUFFER_PADDING_SIZE);
  
  
  
      //codec = avcodec_find_decoder(CODEC_ID_MPEG1VIDEO);
  
      codec = avcodec_find_decoder(AV_CODEC_ID_H264);
  
  
  
  ...

  Error :

  [100%] Linking CXX executable ../../bin/awesom-o
  
  /home/tiburcio/CLionProjects/awesom-o/cmake-build-debug/INSTALL/lib/libavcodec.a(libx264.o): In function `X264_frame':
  
  /home/tiburcio/CLionProjects/awesom-o/cmake-build-debug/ffmpeg/libavcodec/libx264.c:280: undefined reference to `x264_picture_init'
  
  /home/tiburcio/CLionProjects/awesom-o/cmake-build-debug/INSTALL/lib/libavcodec.a(libx264.o): In function `reconfig_encoder':
  
  /home/tiburcio/CLionProjects/awesom-o/cmake-build-debug/ffmpeg/libavcodec/libx264.c:266: undefined reference to `x264_encoder_reconfig'
  
  /home/tiburcio/CLionProjects/awesom-o/cmake-build-debug/INSTALL/lib/libavcodec.a(libx264.o): In function `X264_frame':
  
  /home/tiburcio/CLionProjects/awesom-o/cmake-build-debug/ffmpeg/libavcodec/libx264.c:340: undefined reference to `x264_encoder_encode'