diff --git a/libavformat/mov.c b/libavformat/mov.c
index f41c53e314ba1b7b13cce5732b026191d429ae35..94243b6e8a3e7a6766e282d8c4750456fcfb64a3 100644
--- a/libavformat/mov.c
+++ b/libavformat/mov.c
@@ -1513,17 +1513,17 @@ static int mov_read_header(AVFormatContext *s, AVFormatParameters *ap)
             sc->time_rate=1;
         if(!sc->time_scale)
             sc->time_scale= mov->time_scale;
-        av_set_pts_info(s->streams[i], 64, sc->time_rate, sc->time_scale);
+        av_set_pts_info(st, 64, sc->time_rate, sc->time_scale);
 
         if (st->codec->codec_type == CODEC_TYPE_AUDIO && sc->stts_count == 1)
             st->codec->frame_size = sc->stts_data[0].duration;
 
-        if(s->streams[i]->duration != AV_NOPTS_VALUE){
-            assert(s->streams[i]->duration % sc->time_rate == 0);
-            s->streams[i]->duration /= sc->time_rate;
+        if(st->duration != AV_NOPTS_VALUE){
+            assert(st->duration % sc->time_rate == 0);
+            st->duration /= sc->time_rate;
         }
         sc->ffindex = i;
-        mov_build_index(mov, s->streams[i]);
+        mov_build_index(mov, st);
     }
 
     for(i=0; i<mov->total_streams; i++) {