diff --git a/libavcodec/mpegvideo.c b/libavcodec/mpegvideo.c
index 2fab73dba7f033c4fd2b494e4ff916ac06d3abed..42496ec97f1ba2250be9fba9eb06571532327a06 100644
--- a/libavcodec/mpegvideo.c
+++ b/libavcodec/mpegvideo.c
@@ -963,7 +963,14 @@ int MPV_frame_start(MpegEncContext *s, AVCodecContext *avctx)
             return -1;
 
         s->current_picture_ptr= pic;
-        s->current_picture_ptr->top_field_first= s->top_field_first; //FIXME use only the vars from current_pic
+        //FIXME use only the vars from current_pic
+        if(s->codec_id == CODEC_ID_MPEG1VIDEO || s->codec_id == CODEC_ID_MPEG2VIDEO) {
+            if(s->picture_structure == PICT_FRAME)
+                s->current_picture_ptr->top_field_first= s->top_field_first;
+            else
+                s->current_picture_ptr->top_field_first= (s->picture_structure == PICT_TOP_FIELD) == s->first_field;
+        } else
+            s->current_picture_ptr->top_field_first= s->top_field_first;
         s->current_picture_ptr->interlaced_frame= !s->progressive_frame && !s->progressive_sequence;
     }