code: function parseProgressLine(line) {
    var progress = {};
  
    // Remove all spaces after = and trim
    line  = line.replace(/=\s+/g, '=').trim();
    var progressParts = line.split(' ');
  
    // Split every progress part by "=" to get key and value
    for(var i = 0; i < progressParts.length; i++) {
      var progressSplit = progressParts[i].split('=', 2);
      var key = progressSplit[0];
      var value = progressSplit[1];
  
      // This is not a progress line
      if(typeof value === 'undefined')
        return null;
  
      progress[key] = value;
    }
  
    return progress;
  }
docs: Parse progress line from ffmpeg stderr
  
  @param {String} line progress line
  @return progress object
  @private