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• 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.

• 360 degree video of my OpenGL game

  23 août 2016, par woidler

  I want to make a 360 degree video of my OpenGL game.

  Concerning the rendering :
  Is it enough to render it in OpenGL with a specific projection matrix ?
  If yes, which one ?
  Or can I render it into a cube map, and then encode it ?
  (Which will require much more rendering power and be more complicated, which I want to avoid)

  And how do I encode a 360 degree video with FFMPEG ?

• Extract video thumbnail using PHP without ffmpeg

  18 mai 2018, par SharpAffair

  The question is similar to : Is there any way to create a video thumbnail through PHP without ffmpeg ?
  However, that thread is 6-year old and technologies have evolved since then.

  Any way to extract a thumbnail from uploaded MP4 file using PHP ?

  Ffmpeg is great, but unfortunately unsupported on shared hosting accounts, requiring a dedicated server. And it’s a kinda overkill to use ffmpeg’s power just to generate a video preview picture.

  Any other simple solution ?