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• ffmpeg shared libraries setup on visual studio 2013

  19 décembre 2017, par Hyun Jung

  Setting up ffmpeg shared libraries that are downloaded from ffmpeg zenaroe (https://ffmpeg.zeranoe.com/builds/) for windows_64bit. The IDE is VS2013.

  I downloaded dev and shared build for windows 64bit.

  And followed steps like bellow but when building, linker error happens. The object file is created so compiling seems done. But there seems to be a problem finding referenced functions at the linking stage.

  1. Create win32 project and main.cpp
  2. Copy ffmpeg_dev’s include and lib folders to solution directory.
  3. Open project properties and add the include dir and the lib dir.
  4. Add lib names to linker input.

  5. Build

     main.cpp

     extern "C"{
     
     #include 
     
     }
     
     int main(void){
     
     
     
         av_register_all();
     
     
     
         return 0;
     
     }

  The linker error is :

  LNK2019 unresloved external symbol _av_register_all referenced in function _main.

• How can I bundle ffmpeg in an Electron application

  14 janvier 2024, par jshbrntt

  I'm building an Electron application starting from the electron-webpack boilerplate.

  



  I found this node module @ffmpeg-installer/ffmpeg which installs a compatible precompiled binary into the /node_modules directory then makes the path of that executable accessible through.

  



  const ffmpegPath = require('@ffmpeg-installer/ffmpeg').path


  



  This works fine during development, but when I build the distributable and run it I get an error when attempting to spawn a child process with that path. Presumably, because the path does not point at the binary.

  



  The path is set to the following when running the distributable.

  



  /Users/me/project/dist/mac/AppName.app/Contents/Resources/app.asar/node_modules/@ffmpeg-installer/darwin-x64/ffmpeg


  



  However, when looking in the AppName.app package contents I find the binary in the following path.

  



  /Users/me/project/dist/mac/AppName.app/Contents/Resources/app.asar.unpacked/node_modules/@ffmpeg-installer/darwin-x64/ffmpeg


  



  How should I include binary dependencies in an Electron application using electron-webpack and electron-builder ?

  


• NodeJs : How to pipe two streams into one spawned process stdin (i.e. ffmpeg) resulting in a single output

  20 juin 2018, par Keyne Viana

  In order to convert PCM audio to MP3 I’m using the following :

  function spawnFfmpeg() {
  
      var args = [
  
          '-f', 's16le',
  
          '-ar', '48000',
  
          '-ac', '1',
  
          '-i', 'pipe:0',
  
          '-acodec', 'libmp3lame',
  
          '-f', 'mp3',
  
          'pipe:1'
  
      ];
  
  
  
      var ffmpeg = spawn('ffmpeg', args);
  
  
  
      console.log('Spawning ffmpeg ' + args.join(' '));
  
  
  
      ffmpeg.on('exit', function (code) {
  
          console.log('FFMPEG child process exited with code ' + code);
  
      });
  
  
  
      ffmpeg.stderr.on('data', function (data) {
  
          console.log('Incoming data: ' + data);
  
      });
  
  
  
      return ffmpeg;
  
  }

  Then I pipe everything together :

  writeStream = fs.createWriteStream( "live.mp3" );
  
  var ffmpeg = spawnFfmpeg();
  
  stream.pipe(ffmpeg.stdin);
  
  ffmpeg.stdout.pipe(/* destination */); 

  The thing is... Now I want to merge (overlay) two streams into one. I already found how to do it with ffmpeg : How to overlay two audio files using ffmpeg

  But, the ffmpeg command expects two inputs and so far I’m only able to pipe one input stream into the pipe:0 argument. How do I pipe two streams in the spawned command ? Would something like ffmpeg -i pipe:0 -i pipe:0... work ? How would I pipe the two incoming streams with PCM data (since the command expects two inputs) ?