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• 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'

• Screenshot of video file in Electron Angular project without ffmpeg

  15 juin 2022, par Gary Klasen

  Within my Electron Angular project, I want to preview a video file which is stored locally on Windows / MacOS within a frame, like this :

  


  

  


  On the left side, currently, there is a placeholder image. But i want to have a snapshot out of the video, it is not important at which position of the video this is taken.

  


  Our attempt at the moment is to use fluent-ffmpeg library from npm :

  


  var ffmpeg = require('fluent-ffmpeg');

let command = new ffmpeg({source: "MY_VIDEO_PATH"}).inputOptions('-protocol_whitelist file,http,https,tcp,tls,crypto')

command.takeScreenshots({
    count: 1,
    timemarks: ['5%'],
    filename: "MY_FILENAME"
}, "DESTINATION_FOLDER_PATH_FOR_THUMB");


  


  It takes the screen after 5% of the video would have been played. However, this requires ffmpeg executable to be present, which actually costs more space for the application as we want to use.

  


  So : Can i pick out a screenshot out of a video file without using additional executables like ffmpeg ? If there are some suitable npm libaries, this would be also fine, as they are a lot smaller.

  


• MAINTAINERS : Split project server admin list

  6 août 2022, par Michael Niedermayer

  MAINTAINERS : Split project server admin list
  This updates the list closer to reality.
  
  Iam not a professional server admin, iam happy to help maintain the box as i have
  
  done in the past. But iam not qualified nor volunteering to fix sudden problems
  
  nor do i do major upgrades (i lack the experience to recover the box remotely if
  
  something goes wrong) and also iam not maintaining backups ATM (our backup system
  
  had a RAID-5 failure, raz is working on setting a new one up)
  Maybe this should be signaled in a different way than spliting the lines but ATM
  
  people ping me if something is wrong and what i do is mainly mail/ping raz
  
  and try to find another root admin so raz is not the only active & professional
  
  admin on the team. It would be more efficient if people contact raz and others
  
  directly instead of depending on my waking up and forwarding a "ffmpeg.org" is down note
  Signed-off-by : Michael Niedermayer <michael@niedermayer.cc>
  

  • [DH] MAINTAINERS