Index: opencv/modules/highgui/src/cap_ffmpeg.cpp
===================================================================
--- opencv/modules/highgui/src/cap_ffmpeg.cpp	(revision 4593)
+++ opencv/modules/highgui/src/cap_ffmpeg.cpp	(working copy)
@@ -648,7 +648,8 @@
         break;
 	case CV_CAP_PROP_FRAME_COUNT:
 	    if(video_st->duration != AV_NOPTS_VALUE_)
-		    return (double)video_st->duration;
+	        return (double)ceil(ic->duration * av_q2d(video_st->r_frame_rate) / AV_TIME_BASE);
+		    //return (double)video_st->duration;
 	    break;
     case CV_CAP_PROP_FRAME_WIDTH:
         return (double)frame.width;