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• How to link libav* libraries of FFmpeg in my own program ?

  20 août 2019, par zuguorui

  I am new to FFmpeg, now I want to use the FFmpeg codec compenet in my own program. I’ve followed the guide on FFmpeg wiki to complie the libraries the FFmpeg and get them done. But when I compile my own program it always tips ld: library not found for -lavutil or something like this.

  Environment：MacOS 10.14.6

  Compile tool : clang++

  steps :

  (1)Install all needed libraries follow the wiki.

  (2)./configuure --prefix=host --enable-shared --disable-static

  (3)make

  (4)make install, after this step, I got compiled files in dictionary host.

  (5)copy the source code in FFmpeg/doc/examples/decode_audio.c to create a new project, and copy includes and dylib files to my project dictionary. The structure of my project is :

  ./
  
  |----FFmpeg
  
       |----include
  
            |----libavcodec
  
                 |----*headers*
  
            |----libavformat
  
                 |----*headers*
  
            |----libavutil
  
                 |----*headers*
  
       |----lib
  
            |----libavutil.dylib
  
            |----libavcodec.dylib
  
            |----libavformat.dylib
  
  |----main.cpp

  (6)compile the project.

  clang++ *.cpp -L./FFmpeg/lib/ -lavutil -lavformat -lavcodec -I ./FFmpeg/include -o main.out

  But it always fail with tip ld: library not found for -lavutil or something like this. I don’t know why. Do I need to install those libraries in /usr/local dictionary instead of host ? Or I miss some variables when configing or compiling ?

  update：I solved this problem, I copyed the links of dylib files but not dylib itself, which caused this problem. But a new problem rised, when I run the program, it tips dyld: Library not loaded: @executable_path/lib/libavcodec.dylib. Reason: image not loaded.

• CANNOT LINK EXECUTABLE error with required libs loaded. How to link them properly ? [duplicate]

  11 septembre 2019, par dentex

  This question already has an answer here :

  • Android NDK - Library not found CANNOT LINK EXECUTABLE - how to set LD_LIBRARY_PATH ?
    
    1 answer
    

  edit : I’m aware of the possible duplicate, but the answer it’s not directly applicable. I’m using ProcessBuilder and not Runtime.getRuntime().exec :

  public int execProcess(List<string> cmds, ShellUtils.ShellCallback sc) {    
  
      StringBuilder cmdlog = new StringBuilder();
  
      for (String cmd : cmds) {
  
           cmdlog.append(' ');
  
      }
  
      Utils.logger("v", cmdlog.toString(), DEBUG_TAG);
  
  
  
      ProcessBuilder pb = new ProcessBuilder();
  
      pb.directory(mBinFileDir);
  
      pb.command(cmds);
  
  
  
      Process process = null;
  
      int exitVal = 1; // Default error
  
      try {
  
          process = pb.start();
  
  
  
          StreamGobbler errorGobbler = new
  
          StreamGobbler(process.getErrorStream(), "ERROR", sc);
  
  
  
          StreamGobbler outputGobbler = new
  
          StreamGobbler(process.getInputStream(), "OUTPUT", sc);
  
  
  
          errorGobbler.start();
  
          outputGobbler.start();
  
  
  
          exitVal = process.waitFor();
  
  
  
          sc.processComplete(exitVal);
  
  
  
       } catch (Exception e) {
  
           Log.e(DEBUG_TAG, "Error executing ffmpeg command!", e);
  
       } finally {
  
           if (process != null) {
  
               Utils.logger("w", "destroyng process", DEBUG_TAG);
  
               process.destroy();
  
           }
  
      }
  
      return exitVal;
  
  }
  
  </string>

  ---

  I have two versions on FFmpeg compiled for android : with and without liblame enabled.

  When I load in /data/data/<>/app_bin/ the FFmpeg binary compiled with NO lame support, it extracts audio from video without an issue. But when I use the one with lame support enabled, I get the error below into the log.

  Required libs, also compiled for android, are correctly loaded when shipped into the libs project folder with System.loadLibrary("lame").

  I was wondering if there is something else to do in order to properly make the FFmpeg binary find the libs.
  Those are the same libs given to the NDK to build the FFmpeg binary.

  D/dalvikvm(13741): Trying to load lib /data/app-lib/<>/liblame.so 0x40ffed08
  
  D/dalvikvm(13741): Added shared lib /data/app-lib/<>/liblame.so 0x40ffed08
  
  D/dalvikvm(13741): No JNI_OnLoad found in /data/app-lib/<>/liblame.so 0x40ffed08, skipping init
  
  D/FfmpegController(13741): Trying to chmod '/data/data/<>/app_bin/ffmpeg' to: 755
  
  V/FfmpegController(13741): /data/data/<>/app_bin/ffmpeg -y -i /storage/sdcard0/Download/video.webm -vn -acodec copy /storage/sdcard0/Download/audio.ogg 
  
  >>>>>> ---------- <<<<<<
  
  D/DownloadsService(13741): soinfo_link_image(linker.cpp:1673): could not load library "liblame.so" needed by "/data/data/<>/app_bin/ffmpeg"; caused by load_library(linker.cpp:771): library "liblame.so" not foundCANNOT LINK EXECUTABLE
  
  >>>>>> ---------- <<<<<<
  
  I/DownloadsService(13741): FFmpeg process exit value: 255

  I’m not attaching code because it’s fairly straightforward :

  • download the FFmpeg binary (it’s not shipped with the app) ;
  • copy the binary from the download folder to /data/data/<>/app_bin/ ;
  • chmod 755 ;
  • execute from there and read the output.

  Please comment if something else is required.

• avfilter/vf_unsharp : rename config_props -> config_input, link -> inlink

  14 octobre 2019, par Limin Wang

  avfilter/vf_unsharp : rename config_props -> config_input, link -> inlink
  Signed-off-by : Limin Wang <lance.lmwang@gmail.com>
  
  Signed-off-by : Michael Niedermayer <michael@niedermayer.cc>
  

  • [DH] libavfilter/vf_unsharp.c