diff --git a/lib/processor.js b/lib/processor.js
index 36d980ad..101967a9 100644
--- a/lib/processor.js
+++ b/lib/processor.js
@@ -2,8 +2,6 @@
 'use strict';
 
 var spawn = require('child_process').spawn;
-var path = require('path');
-var fs = require('fs');
 var async = require('async');
 var utils = require('./utils');
 
@@ -68,6 +66,7 @@ module.exports = function(proto) {
    * @param {String} codecData.audio_details input audio codec parameters
    * @param {String} codecData.video input video codec name
    * @param {String} codecData.video_details input video codec parameters
+   * @param {String} codecData.duration input video duration
    */
 
   /**
diff --git a/lib/utils.js b/lib/utils.js
index 96909dbd..ef5ba04c 100644
--- a/lib/utils.js
+++ b/lib/utils.js
@@ -294,7 +294,7 @@ var utils = module.exports = {
       inInput = codecsObject.inInput = true;
       inputIndex = codecsObject.inputIndex = codecsObject.inputIndex + 1;
 
-      inputStack[inputIndex] = { format: format[1], audio: '', video: '', duration: '' };
+      inputStack[inputIndex] = { format: format[1], audio: '', audio_details: '', video: '', video_details: '', duration: '' };
     } else if (inInput && (dur = stderrLine.match(durPattern))) {
       inputStack[inputIndex].duration = dur[1];
     } else if (inInput && (audio = stderrLine.match(audioPattern))) {