diff --git a/ffplay.c b/ffplay.c
index 30ee5fdf43fc5796dae0229482e694226fcc4f17..4893ebcb2f5bbcaac6a001a6898af2605b1c86bc 100644
--- a/ffplay.c
+++ b/ffplay.c
@@ -2818,6 +2818,13 @@ static int read_thread(void *arg)
     }
 
     is->show_mode = show_mode;
+    if (st_index[AVMEDIA_TYPE_VIDEO] >= 0) {
+        AVStream *st = ic->streams[st_index[AVMEDIA_TYPE_VIDEO]];
+        AVCodecContext *avctx = st->codec;
+        VideoPicture vp = {.width = avctx->width, .height = avctx->height, .sar = av_guess_sample_aspect_ratio(ic, st, NULL)};
+        if (vp.width)
+            set_default_window_size(&vp);
+    }
 
     /* open the streams */
     if (st_index[AVMEDIA_TYPE_AUDIO] >= 0) {