From: Ettore Di Giacinto <mudler@sabayonlinux.org>
--- ext/ffmpeg/gstffmpegdemux.c~	2015-05-29 00:52:07.601606544 +0200
+++ ext/ffmpeg/gstffmpegdemux.c	2015-05-29 01:18:18.533113323 +0200
@@ -781,8 +781,8 @@
           break;
         case GST_FORMAT_DEFAULT:
           gst_query_set_position (query, GST_FORMAT_DEFAULT,
-              gst_util_uint64_scale (timeposition, avstream->r_frame_rate.num,
-                  GST_SECOND * avstream->r_frame_rate.den));
+              gst_util_uint64_scale (timeposition, avstream->avg_frame_rate.num,
+                  GST_SECOND * avstream->avg_frame_rate.den));
           res = TRUE;
           break;
         case GST_FORMAT_BYTES:
@@ -818,8 +818,8 @@
           break;
         case GST_FORMAT_DEFAULT:
           gst_query_set_duration (query, GST_FORMAT_DEFAULT,
-              gst_util_uint64_scale (timeduration, avstream->r_frame_rate.num,
-                  GST_SECOND * avstream->r_frame_rate.den));
+              gst_util_uint64_scale (timeduration, avstream->avg_frame_rate.num,
+                  GST_SECOND * avstream->avg_frame_rate.den));
           res = TRUE;
           break;
         case GST_FORMAT_BYTES: