use command data to extract progress percent

Author: richywalls

lib/processor.js

@@ -516,14 +516,8 @@ module.exports = function(proto) {
 
             // 'progress' event
             if (self.listeners('progress').length) {
-              var duration = 0;
-
-              if (self._ffprobeData && self._ffprobeData.format && self._ffprobeData.format.duration) {
-                duration = Number(self._ffprobeData.format.duration);
-              }
-
               stderrRing.callback(function(line) {
-                utils.extractProgress(self, line, duration);
+                utils.extractProgress(self, line);
               });
             }
           }

lib/utils.js

@@ -324,7 +324,7 @@ var utils = module.exports = {
    * @param {Number} [duration=0] expected output duration in seconds
    * @private
    */
-  extractProgress: function(command, stderrLine, duration) {
+  extractProgress: function(command, stderrLine) {
     var progress = parseProgressLine(stderrLine);
 
     if (progress) {
@@ -338,10 +338,11 @@ var utils = module.exports = {
       };
 
       // calculate percent progress using duration
-      if (duration && duration > 0) {
-        ret.percent = (utils.timemarkToSeconds(ret.timemark) / duration) * 100;
+      if (command._ffprobeData && command._ffprobeData.format && command._ffprobeData.format.duration) {
+        var duration = Number(command._ffprobeData.format.duration);
+        if (!isNaN(duration))
+          ret.percent = (utils.timemarkToSeconds(ret.timemark) / duration) * 100;
       }
-
       command.emit('progress', ret);
     }
   },