diff --git a/libavcodec/h264.c b/libavcodec/h264.c
index 5fb303c82f..eb873a4855 100644
--- a/libavcodec/h264.c
+++ b/libavcodec/h264.c
@@ -1914,6 +1914,9 @@ static int decode_slice_header(H264Context *h, H264Context *h0){
         s->avctx->sample_aspect_ratio= h->sps.sar;
         av_assert0(s->avctx->sample_aspect_ratio.den);
 
+        h->s.avctx->coded_width = 16*s->mb_width;
+        h->s.avctx->coded_height = 16*s->mb_height;
+
         if(h->sps.video_signal_type_present_flag){
             s->avctx->color_range = h->sps.full_range ? AVCOL_RANGE_JPEG : AVCOL_RANGE_MPEG;
             if(h->sps.colour_description_present_flag){