Index: libavformat/oggdec.c
===================================================================
--- libavformat/oggdec.c	(revision 19439)
+++ libavformat/oggdec.c	(working copy)
@@ -469,6 +469,18 @@
     ogg->size = size;
     ogg_restore (s, 0);
 
+    ogg_save (s);
+    url_fseek (s->pb, 0, SEEK_SET);
+    while (!ogg_read_page (s, &i)){
+        if (ogg->streams[i].granule != -1 && ogg->streams[i].granule != 0 && 
+            idx == i) {
+            s->streams[idx]->duration -=
+                ogg_gptopts (s, idx, ogg->streams[idx].granule);
+            break;
+        }
+    }
+    ogg_restore (s, 0);
+
     return 0;
 }