--- a/src/quicktimevideo.cpp	(revision 3536)
+++ a/src/quicktimevideo.cpp	(revision 3537)
@@ -1459,9 +1459,9 @@ 
                 break;
             case MediaDuration:
                 if(currentStream_ == Video)
-                    xmpData_["Xmp.video.MediaDuration"] = returnBufValue(buf)/time_scale;
+                    xmpData_["Xmp.video.MediaDuration"] = time_scale ? returnBufValue(buf)/time_scale : 0 ;
                 else if (currentStream_ == Audio)
-                    xmpData_["Xmp.audio.MediaDuration"] = returnBufValue(buf)/time_scale;
+                    xmpData_["Xmp.audio.MediaDuration"] = time_scale ? returnBufValue(buf)/time_scale : 0;
                 break;
             case MediaLanguageCode:
                 if(currentStream_ == Video)
@@ -1515,9 +1515,9 @@ 
                 break;
             case TrackDuration:
                 if(currentStream_ == Video)
-                    xmpData_["Xmp.video.TrackDuration"] = returnBufValue(buf)/timeScale_;
+                    xmpData_["Xmp.video.TrackDuration"] = timeScale_ ? returnBufValue(buf)/timeScale_ : 0;
                 else if(currentStream_ == Audio)
-                    xmpData_["Xmp.audio.TrackDuration"] = returnBufValue(buf)/timeScale_;
+                    xmpData_["Xmp.audio.TrackDuration"] = timeScale_ ? returnBufValue(buf)/timeScale_ : 0;
                 break;
             case TrackLayer:
                 if(currentStream_ == Video)