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• how to resolve Linking error undefined reference to symbol 'avcodec_open2@@LIBAVCODEC_54

  20 septembre 2016, par TobSta

  I’m getting the following linking error

  Linking CXX executable test_decode
  
  /usr/bin/ld: /home/t/NetBeansProjects/FaceCept3D/WrapFFMPEG/libWrapFFMPEG.a(DecodeFFMPEG.cpp.o): undefined reference to symbol 'avcodec_open2@@LIBAVCODEC_54'
  
  //usr/lib/x86_64-linux-gnu/libavcodec.so.54: error adding symbols: DSO missing from command line
  
  collect2: error: ld returned 1 exit status
  
  make[2]: *** [test_decode] Error 1
  
  make[1]: *** [CMakeFiles/test_decode.dir/all] Error 2
  
  make: *** [all] Error 2

  cmake . && make works for WrapFFMPEG, but for test_decode, i get the linking error when building

  My CMakeLists.txt for test_decode :

  cmake_minimum_required (VERSION 2.8)
  
  #cmake_policy(SET CMP0003 OLD)
  
  
  
  # Add executable
  
  add_executable(test_decode test_decode.cpp)
  
  
  
  find_package(OpenCV REQUIRED )
  
  message(STATUS ${OPENCV_INCLUDE_DIRS})
  
  include_directories (${OPENCV_INCLUDE_DIRS},      "/home/t/NetBeansProjects/FaceCept3D/WrapFFMPEG")
  
  find_library (WrapFFMPEG WrapFFMPEG "/home/t/NetBeansProjects/FaceCept3D/WrapFFMPEG")
  
  
  
  
  
  message(STATUS ${WrapFFMPEG})
  
  link_directories( ${WrapFFMPEG} )
  
  
  
  
  
  # Link to the WrapFFMPEG library
  
  target_link_libraries(test_decode LINK_PUBLIC ${OpenCV_LIBRARIES} ${WrapFFMPEG})
  
  
  
  add_custom_command(TARGET test_decode POST_BUILD COMMAND xcopy /i /y \"${FFmpeg_RUNTIME_LIBS}\" \"${CMAKE_CURRENT_BINARY_DIR}\")

  and my CMakeLists.txt for WrapFFMPEG :

  cmake_minimum_required (VERSION 2.8)
  
  file(GLOB sources *.cpp *.h)
  
  
  
  list(APPEND CMAKE_MODULE_PATH "/home/t/NetBeansProjects/FaceCept3D/WrapFFMPEG")
  
  
  
  find_package( avformat REQUIRED)
  
  find_package( avcodec REQUIRED)
  
  find_package( avutil REQUIRED )
  
  find_package( swscale REQUIRED )
  
  
  
  include_directories(    
  
  ${AVFORMAT_INCLUDE_DIR}
  
  ${AVCODEC_INCLUDE_DIR}
  
  ${AVUTIL_INCLUDE_DIR}
  
  ${SWSCALE_INCLUDE_DIR}
  
  )
  
  
  
  
  
  set( 
  
  FFMPEG_LIBRARIES    
  
  ${AVFORMAT_LIBRARY}
  
  ${AVCODEC_LIBRARY}
  
  ${AVUTIL_LIBRARY}
  
  ${SWSCALE_LIBRARY}
  
  )
  
  
  
  add_library(WrapFFMPEG ${sources})
  
  
  
  #add_library(WrapFFMPEG DecodeFFMPEG.cpp DecodeFFMPEG.h )
  
  set(FFMPEG_INCLUDE_DIR     "/home/t/NetBeansProjects/FaceCept3D/WrapFFMPEG/ffmpeg")
  
  find_library (FFMPEG FFMPEG "/home/t/NetBeansProjects/FaceCept3D/WrapFFMPEG/ffmpeg")
  
  message(STATUS ${FFMPEG_LIBRARIES})
  
  message(STATUS ${FFMPEG})
  
  include_directories($(FFMPEG_INCLUDE_DIR}))
  
  message(STATUS ${FFMPEG_INCLUDE_DIR})
  
  
  
  
  
  # Make sure the compiler can find include files for our WrapFFMPEG library
  
  # when other libraries or executables link to WrapFFMPEG
  
  target_include_directories (WrapFFMPEG PUBLIC ${CMAKE_CURRENT_SOURCE_DIR})
  
  target_link_libraries(WrapFFMPEG avutil avcodec avformat swscale)

  resulting in link.txt :

  /usr/bin/ar cq libWrapFFMPEG.a CMakeFiles/WrapFFMPEG.dir/DecodeFFMPEG.cpp.o CMakeFiles/WrapFFMPEG.dir/Tutorial.cpp.o /usr/bin/ranlib libWrapFFMPEG.a

  did CMake not find ffmpeg ?

• mix two audio files fmpeg Android

  21 mars 2016, par Adroid Freak

  I’m using ffmpeg for android and I’m trying to mix two audio files but I’m getting the following error

   [NULL @ 0xb60c8c00] Unable to find a suitable output format for ' -filter_complex amerge -c:a libmp3lame -q:a 4 '
  
  -filter_complex amerge -c:a libmp3lame -q:a 4 : Invalid argument

  This is the ffmpeg library details when

  ffmpeg version n2.4.2 Copyright (c) 2000-2014 the FFmpeg developers
  
  built on Dec 22 2014 21:35:30 with gcc 4.8 (GCC)
  
  configuration: --target-os=linux --cross-prefix=/home/android/Downloads/ffmpeg-android-pie/toolchain-android/bin/arm-linux-androideabi- --arch=arm --cpu=cortex-a8 --enable-runtime-cpudetect --sysroot=/home/android/Downloads/ffmpeg-android-pie/toolchain-android/sysroot --enable-decoders --enable-encoders --enable-filters --disable-indevs --enable-indev=lavfi --disable-outdevs --enable-hwaccels --enable-ffmpeg --enable-pic --enable-libx264 --enable-version3 --disable-debug --disable-ffserver --disable-ffplay --disable-ffprobe --enable-gpl --enable-yasm --disable-doc --disable-shared --enable-static --pkg-config=/home/android/Downloads/ffmpeg-android-pie/ffmpeg-pkg-config --prefix=/home/android/Downloads/ffmpeg-android-pie/build/armeabi-v7a --extra-cflags='-I/home/android/Downloads/ffmpeg-android-pie/toolchain-android/include -U_FORTIFY_SOURCE -D_FORTIFY_SOURCE=2 -fno-strict-overflow -fstack-protector-all' --extra-ldflags='-L/home/android/Downloads/ffmpeg-android-pie/toolchain-android/lib -Wl,-z,relro -Wl,-z,now -pie' --extra-libs='-lpng -lexpat -lm' --extra-cxxflags=
  
  libavutil      54.  7.100 / 54.  7.100
  
  libavcodec     56.  1.100 / 56.  1.100
  
  libavformat    56.  4.101 / 56.  4.101
  
  libavdevice    56.  0.100 / 56.  0.100
  
  libavfilter     5.  1.100 /  5.  1.100
  
  libswscale      3.  0.100 /  3.  0.100
  
  libswresample   1.  1.100 /  1.  1.100
  
  libpostproc    53.  0.100 / 53.  0.100

  My function is this

  public Clip mixTwoAudioFiles (String audio1, String audio2, Clip out, ShellCallback sc) throws Exception
  
  {
  
      ArrayList<string> cmd = new ArrayList<string>();
  
  
  
      cmd.add(mFfmpegBin);
  
      cmd.add("-y");
  
  
  
      cmd.add("-i");
  
      cmd.add(audio1);
  
  
  
      cmd.add("-i");
  
      cmd.add(audio2);
  
  //  cmd.add("-strict");
  
  //  cmd.add("-2");//experimental
  
  
  
      cmd.add(" -filter_complex amerge -c:a libmp3lame -q:a 4 ");   
  
      File fileOut = new File(out.path);
  
      cmd.add(fileOut.getCanonicalPath());    
  
      execFFMPEG(cmd, sc); 
  
      return out;
  
  
  
  }
  
  </string></string>

  and the output command is this

  ffmpeg -y -i /storage/emulated/0/audio1.mp3 -i /storage/emulated/0/audio2.3gp -strict -2  -filter_complex amerge -c:a libmp3lame -q:a 4  /storage/emulated/0/out.mp4 

  Now as you can see above I don’t have libmp3lame enabled but it looks like the error above is not related to that, correct ?

  I tried many other filter variations but all are failing with the same error, the questions I have are as follow :

  1- Since I don't have libmp3lame, what is the next option? please note that mp3 is not mandatory here.
  
  2- If it is possible can you please show me how?

• Python Send stdout and stderr to Multiple files using stored in Variable

  17 avril 2021, par D0n

  Here is my scripts

  


  csv_location = '/home/scripts/streams.csv'
ffmpeg_location = '/usr/bin/ffmpeg'
ffmpeglogs = '/home/scripts/ffmpeglog/'

# Open the streams list csv file
with open(csv_location) as csv_file:
    csv_reader = csv.reader(csv_file, delimiter=',')
    for row in csv_reader:
        ffmpeg_log = (ffmpeglogs + row[0]) # set the ffmpeg log to be named the stream name
        # Open log file for writing
        with open(ffmpeg_log, 'wb') as ffmpeg_output: 
            # Iterate through streams list
            for row in csv_reader:
                print(row)
                stream_output = (row[0] + ".mpeg") # stream output variable
                # Subprocess record 1 stream at a time & send the output t0 stdout & stdeer
                ffmpeg_instance = subprocess.Popen([ffmpeg_location, '-t', '10', '-i', row[1], stream_output], stdout=subprocess.PIPE, stderr=subprocess.PIPE)
                # sent output to ffmpeg log
                ffmpeg_output.write(ffmpeg_instance.communicate()[1])


  


  Here is my CSV File

  


  Name,RTSP_URL
stream1,rtsp://wowzaec2demo.streamlock.net/vod/mp4:BigBuckBunny_115k.mov
stream3,rtsp://wowz.streamlock.net/vod/mp4:BigBuckBunny_115k.mov
stream4,rtsp://wowzaec2demo.streamlock.net/vod/mp4:BigBuckBunny_115k.mov


  


  So I have a script that reads a CSV file and ffmpeg records the video for 10 seconds. Then spits the output of the FFMPEG to a file. I need each camera to have its own file. Really just to log FFMPEG output for each camera. But my issue is that the FFMPEG output for multiple cameras get written to 1 file.

  


  Here is what I want to see in /home/scripts/ffmpeglog/

  


  stream1 stream3 stream4


  


  Here's what I'm actually what I see in /home/scripts/ffmpeglog/

  


  name stream1