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• Looking for Sox (Sound eXchange) libs port for android

  5 octobre 2016, par azure313

  I’m new to mobile development, and i’m developing a mobile application with sound effect functions.
  I find out that Sox (Sound eXchange) is very strong in desktop environment, and very easy to use, but it didn’t have any libs Port for Android.

  Does anyone know how to port SoX to Android or is there any other libs instead ?

  I already try ffmpeg, but it didn’t have Reverb effect, so i switch to SoX.

  Thank.

• How to convert stereo sound to mono with FFmpeg ?

  16 septembre 2016, par Meugiwara

  I use the FFmpeg library for a personnal project and I need help about one thing. I have a music file in stereo sound and I want to convert this stereo sound to mono sound ? Is it possible with this library ? Is there a function inside to do this job ? My project is in C/C++.

  I searched on the Doxygen documentation on the FFmpeg website and on this forum but I didn’t find something interesting.

  Thanks for reading !

• no sound when streaming mkv video to html 5 video player via node js

  8 septembre 2013, par Tristan

  I have been playing around with building a simple html 5 media server for all my mkv files since I discovered chrome can play them when just dragging and dropping the file into a new tab !

  So I actually have something up and going and I am able to stream the mkv files through a nodejs sever to a simple html 5 video player, the only problem is there is no sound and the volume icon in the controls is crossed and greyed out !

  Now I realise that mkv files can have multiple audio streams within and this is probably my issue, that the video player doesn't know which one to use or is missing it for some reason.

  I have avoided using ffmpeg for the time being as I wanted to stream the videos without any transcoding (and without using express as shown in the fluent-ffmpeg stream example).

  See below for the code I use to stream the video :

  cFs.exists(sFileName, function(bExists){
  
      if (bExists)
  
      {
  
          var cFile = null;
  
  
  
          var cStat = cFs.statSync(sFileName);
  
  
  
          if (cRequest.headers['range'])
  
          {
  
              var aParts = cRequest.headers['range'].replace(/bytes=/, "").split("-");
  
  
  
              var nStart = parseInt(aParts[0], 10);
  
              var nEnd = aParts[1] ? parseInt(aParts[1], 10) : cStat.size - 1;
  
              var nChunkSize = (nEnd - nStart) + 1;
  
  
  
              cFile = cFs.createReadStream(sFileName, {start: nStart, end: nEnd});
  
              cResponse.writeHead(206, {
  
                  "Content-Type": "video/x-matroska",
  
                  "Content-Range": "bytes " + nStart + "-" + nEnd + "/" + cStat.size,
  
                  "Accept-Ranges": "bytes",
  
                  "Content-Length": nChunkSize
  
  
  
              });
  
  
  
              cFile.pipe(cResponse);
  
  
  
              cRequest.on('close', function(){
  
                  cFile.destroy();
  
              });
  
          }
  
          else
  
          {
  
              cResponse.writeHead(200, {
  
                  "Content-Type": "video/x-matroska",
  
                  "Content-Length": cStat.size
  
              });
  
  
  
              cFile = cFs.createReadStream(sFileName);
  
              cFile.pipe(cResponse);
  
          }
  
  
  
          cRequest.on('close', function(){
  
              if (cFile)
  
              {
  
                  cFile.destroy();
  
              }
  
          });
  
  
  
          /*new ffmpeg({
  
              source: sFileName
  
          }).toFormat('webm').writeToStream(cResponse, function(){
  
              console.log(arguments);
  
          });*/
  
      }
  
      else
  
      {
  
          cResponse.writeHead(404, {
  
              "Content-Type": "text/plain"
  
          });
  
  
  
          cResponse.write("404 Not Found\n");
  
          cResponse.end();
  
      }
  
  });

  if you could help me sort out the sound for the code above or can provide a fluent-ffmpeg solution without using express and retaining as much image quality as possible that would be great !