Recherche avancée

Sur d’autres sites (11294)

• 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.

• matroskadec : introduce resync function.

  28 mai 2013, par Sean McGovern

  matroskadec : introduce resync function.
  This allows handling matroska files with errors.
  
  Fixes test4.mkv and test7.mkv from the official Matroska test suite,
  
  and by extension Bugzilla #62.
  Based on a patch by Reimar Doffinger <Reimar.Doeffinger@gmx.de>
  Signed-off-by : Anton Khirnov <anton@khirnov.net>
  

  • [DBH] libavformat/matroskadec.c

• ffmpeg : Turning images/audio into video with ffmpeg

  7 mai 2018, par melanie93

  I am using ffmpeg to turn a sequence of images (img001.png, img002.png, and so on) into a video (output.mp4) using the following command :

  ffmpeg -r 1/5 -i img%03d.png  -r 25 -qscale:v 2 -shortest -codec:a copy output.mp4

  The result is a video that displays every input image for five (5) seconds.

  1. Is it possible to have ffmpeg parse the filename paths and timings from a file ? I tried the slideshow tutorial on the official ffmpeg website but the output displayed only the last image, briefly, at the end of the video.
  2. Is it possible to bundle audio files with those settings ?

  For example :

  file 'image001.png'
  
  file 'sound001.wav'
  
  duration 5
  
  file 'image002.png'
  
  file 'sound002.wav'
  
  duration 2
  
  file 'image003.png'
  
  file 'sound003.wav'
  
  duration 3

  Image001 is displayed for five(5) seconds while sound001 is being played back and so on.