--- a/libavcodec/mpegvideo.c
+++ b/libavcodec/mpegvideo.c
@@ -538,6 +538,8 @@
     s->avctx->width         = s1->avctx->width;
     s->avctx->height        = s1->avctx->height;
 
+    s->quarter_sample       = s1->quarter_sample;
+
     s->coded_picture_number = s1->coded_picture_number;
     s->picture_number       = s1->picture_number;