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• Convert wav to mp3 using Meteor FS Collections on Startup

  28 juillet 2015, par TheBetterJORT

  I’m trying to transcode all wav files into a mp3 using Meteor and Meteor FS Collections. My code works when I upload a wav file to the uploader — That is it will convert the wav to a mp3 and allow me to play the file. But, I’m looking for a Meteor Solution that will transcode and add the file to the DB if the file is a wav and exist in a certain directory. According to the Meteor FSCollection it should be possible if the files have already been stored. Here is their example code : *GM is for ImageMagik, I’ve replaced gm with ffmpeg and installed ffmpeg from atmosphereJS.

  Images.find().forEach(function (fileObj) {
  
    var readStream = fileObj.createReadStream('images');
  
    var writeStream = fileObj.createWriteStream('images');
  
    gm(readStream).swirl(180).stream().pipe(writeStream);
  
  });

  I’m using Meteor-CollectionFS [https://github.com/CollectionFS/Meteor-CollectionFS]-

  if (Meteor.isServer) {
  
    Meteor.startup(function () {
  
          Wavs.find().forEach(function (fileObj) {
  
        var readStream = fileObj.createReadStream('.wavs/mp3');
  
        var writeStream = fileObj.createWriteStream('.wavs/mp3');
  
        this.ffmpeg(readStream).audioCodec('libmp3lame').format('mp3').pipe(writeStream);
  
        Wavs.insert(fileObj, function(err) {
  
        console.log(err);
  
      });
  
        });
  
        });
  
  }

  And here is my FS.Collection and FS.Store information. Currently everything resides in one JS file.

  Wavs = new FS.Collection("wavs", {
  
    stores: [new FS.Store.FileSystem("wav"),
  
      new FS.Store.FileSystem("mp3",
  
  
  
      {
  
        path: '~/wavs/mp3',
  
        beforeWrite: function(fileObj) {
  
          return {
  
            extension: 'mp3',
  
            fileType: 'audio/mp3'
  
          };
  
        },
  
        transformWrite: function(fileObj, readStream, writeStream) {
  
          ffmpeg(readStream).audioCodec('libmp3lame').format('mp3').pipe(writeStream);
  
        }
  
      })]
  
  });

  When I try and insert the file into the db on the server side I get this error : MongoError : E11000 duplicate key error index :

  Otherwise, If I drop a wav file into the directory and restart the server, nothing happens. I’m new to meteor, please help. Thank you.

• FFMPEG Does not work on Windows Server 2008

  25 août 2011, par Khaldoun

  I have an ASP.NET MVC Web Site ,the user can upload a video and When Done It finish uploading I show him an image extracted from the Video,
  To do this I used the FFMPEG exe to get a frame.
  Everthing works well in the developement machine , when I use the test environement it does not work !!
  I've given the read/write and execute permissions to following folders :
  1. videos(folder that store uploaded video files)
  2. thumbnails (folder that store the thumbnails of videos, captured by ffmpeg)
  3.ffmpeg.exe file at root and given read/write execute permissions to that file also.
  but it does not work.

   var _converter = new ImageConvertor(@System.Configuration.ConfigurationManager.AppSettings["FFmpegExec"].ToString());
  
              _converter.WorkingPath = Server.MapPath("~/VideoSamples");
  
              OutputPackage oo = _converter.ConvertToFLV(videoFilepath);
  
              FileStream outStream = System.IO.File.OpenWrite(Path.Combine(Server.MapPath("~/VideoSamples"), id.ToString() + ".flv"));
  
              oo.VideoStream.WriteTo(outStream);

  This Code Works on developement env but not in test env !!!
  Any Ideas Please

• Encoding `pp::VideoFrame` and `pp::AudioBuffer` using ffmpeg

  1er août 2015, par Debanshu Kundu

  I am trying to encode video and audio streams captured using getUserMedia and store them in a file using NACL. My current progress is that I have the pp::VideoFrames and pp::AudioBuffers in NACL code and they am storing them a buffers (arrays) and now I want to pass them to a function which would encode them and mux and store in a container format. I am currently trying to do this using ffmpeg (which is already ported to NACL). I was successfully able to run a sample code for muxing a video and a audio streams (generated in the code itself) using ffmpeg.

  Now I am stuck on converting the video frames and audio samples which I have in the buffers to the format which would be acceptable by ffmpeg’s encoder. As I understand it needs those as objects of AVFrame. But I have no idea how I am going to convert pp::VideoFrame and/or pp::AudioBuffer to AVFrame.