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• cmake build error with libswresample, works fine with clang

  19 août 2018, par Dan Gordon

  I’m building an FFmpeg project with CLion which uses cmake to compile the code. Everything has been working great until I started to use the libswresample library. For some reason, cmake isn’t seeing the dylib and won’t build the code.

  /Applications/CLion.app/Contents/bin/cmake/mac/bin/cmake --build /Users/user/CLionProjects/IC4D/cmake-build-debug --target all -- -j 4
  
  [ 50%] Linking C executable IC4D
  
  Undefined symbols for architecture x86_64:
  
    "_swr_alloc_set_opts", referenced from:
  
        _audio_decode_frame in main.c.o
  
    "_swr_convert", referenced from:
  
        _audio_decode_frame in main.c.o
  
    "_swr_free", referenced from:
  
        _audio_decode_frame in main.c.o
  
    "_swr_init", referenced from:
  
        _audio_decode_frame in main.c.o
  
    "_swr_set_compensation", referenced from:
  
        _audio_decode_frame in main.c.o
  
  ld: symbol(s) not found for architecture x86_64
  
  clang: error: linker command failed with exit code 1 (use -v to see invocation)
  
  make[2]: *** [IC4D] Error 1
  
  make[1]: *** [CMakeFiles/IC4D.dir/all] Error 2
  
  make: *** [all] Error 2

  But if I run this clang code, it compiles just fine

  clang -I/usr/local/include -L/usr/local/lib -lavcodec -lavcodec -lswscale -lavformat -lswresample -lSDL2 -lavutil -o IC4D2 ../main.c

  Here’s my CMakeList.txt file :

  cmake_minimum_required(VERSION 3.10)
  
  project(IC4D C)
  
  
  
  set(CMAKE_C_STANDARD 99)
  
  
  
  include_directories( /Users/user/CLionProjects/IC4D/include/ )
  
  link_directories( /Users/user/CLionProjects/IC4D/lib/ )
  
  
  
  find_path(AVDEVICE_INCLUDE_DIR include/libavdevice/avdevice.h)
  
  find_library(AVDEVICE_LIBRARY lib/libavdevice.58.dylib)
  
  
  
  find_path(AVFORMAT_INCLUDE_DIR include/libavformat/avformat.h)
  
  find_library(AVFORMAT_LIBRARY lib/libavformat.58.dylib)
  
  
  
  find_path(AVCODEC_INCLUDE_DIR include/libavcodec/avcodec.h)
  
  find_library(AVCODEC_LIBRARY lib/libavcodec.58.dylib)
  
  
  
  find_path(SWSCALE_INCLUDE_DIR include/libswscale/swscale.h)
  
  find_library(SWSCALE_LIBRARY lib/libswscale.5.dylib)
  
  
  
  find_path(AVUTIL_INCLUDE_DIR include/libavutil/avutil.h)
  
  find_library(AVUTIL_LIBRARY lib/libavutil.56.dylib)
  
  
  
  find_path(SWRESAMPLE_INCLUDE_DIR include/libswresample/swresample.h)
  
  find_library(SWRESAMPLE_LIBRARY lib/libswresample.3.dylib)
  
  
  
  find_package(SDL2 REQUIRED)
  
  
  
  add_executable(IC4D main.c)
  
  
  
  target_include_directories(IC4D PRIVATE ${SDL2_INCLUDE_DIRS} ${AVDEVICE_INCLUDE_DIR} ${AVFORMAT_INCLUDE_DIR} ${AVCODEC_INCLUDE_DIR} ${SWSCALE_INCLUDE_DIR} ${AVUTIL_INCLUDE_DIR} ${SWRESAMPLE_INCLUDE_DIR})
  
  target_link_libraries(IC4D PRIVATE ${SDL2_LIBRARIES} ${AVDEVICE_LIBRARY} ${AVFORMAT_LIBRARY} ${AVCODEC_LIBRARY} ${SWSCALE_LIBRARY} ${AVUTIL_LIBRARY} ${SWRESAMPLE_LIBRARY})

  What am I doing wrong with cmake ?

  Thanks

• How to play local video using ffplay and nginx ?

  17 février 2016, par Bhoomi Loriya
  • I want to play video using ffplay.I store data in local machine.
    directory path is like :
    C:\ffmpeg\bin
  • Using this command i cant play this video.
    
ffplay frlive.m3u8
  • Above code can’t work.
  • If i am play live video than they work fine this code is like :
    ffplay -i  <a href="http://media.webtvlive.eu/rtc/_definst_/mp4:live_720p.stream/playlist.m3u" rel="nofollow">http://media.webtvlive.eu/rtc/<em>definst</em>/mp4:live_720p.stream/playlist.m3u</a>
     This code work properly.

• How to use system command in php ?

  11 juin 2019, par flash

  I am working on a PHP code as shown below in which conversion of mp4 into mp3 is happening at Line B.

  I have added if block after system command to print Conversion Completed on the webpage once the conversion is complete but it doesn’t seem to work.

  Php code :

  if (isset($_POST['id']))
  
  {
  
      for($i=0; $i / Line A        
  
  
  
                  system('ffmpeg -i ' . $filePath . ' -map 0:2 -ac 1 ' . $destination_dir . DS . $parts['filename'] . '.mp3', $result);  // Line B
  
  
  
                  if($result)
  
                  {
  
                      echo "Conversion Completed";
  
                  }
  
  
  
              }
  
          }
  
      }
  
  } 

  Problem Statement :

  I am wondering what changes I should make in the PHP code above so that once the conversion is complete ; on the webpage, it should print Conversion Completed.