Recherche avancée

Sur d’autres sites (6560)

• ffmpeg conversion dimension error

  7 mars 2015, par georgechalhoub

  I am writing a video conversion script using ffmpeg, it has been completed to full. Ideally, my video conversion script should output the video to many formats (similar to YouTube) :

  • 140p : 256 x 144
  • 240p : 426 x 240
  • 360p : 640  x 360
  • 480p : 854  x 480
  • 720p : 1280 x 720
  • 1080p : 1920x 1080

  The problem I am facing is that if a user uploads a 480p (854 x 480) video or close to 480p (854 x 480) the script will convert to all formats (1080p and 720p) which would seem like a waste of bandwidth and disk space in this case.

  The problem isn’t as easy as it seems. If a user uploads a 500 x 300 video I don’t want it to get converted to a 240p, there has to be some estimations.

  Is there some command in ffmpeg which does any help dealing with such type of problems ?

• Convert a ffmpeg video to an appropriate dimension

  6 mars 2015, par georgechalhoub

  I am writing a video conversion script using ffmpeg, it has been completed to full. Ideally, my video conversion script should output the video to many formats (like YouTube) :

  • 140p : 256 x 144
  • 240p : 426 x 240
  • 360p : 640  x 360
  • 480p : 854  x 480
  • 720p : 1280 x 720
  • 1080p : 1920x 1080

  The problem I am facing is that if a user uploads a 480p (854 x 480) video or close to 480p (854 x 480) the script will convert to all formats (1080p and 720p) which would seem like a waste of bandwidth and disk space in this case.

  The problem isn’t as easy as it seems. If a user uploads a 500 x 300 video I don’t want it to get converted to a 240p, there has to be some estimations.

  Who can help me or has some experience with such kind of problems ?

• 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.