diff --git a/libavfilter/avfilter.c b/libavfilter/avfilter.c
index 349d0af0ee..5739b765ac 100644
--- a/libavfilter/avfilter.c
+++ b/libavfilter/avfilter.c
@@ -221,6 +221,7 @@ void avfilter_start_frame(AVFilterLink *link, AVFilterPicRef *picref)
         link->cur_pic = avfilter_default_get_video_buffer(link, dst->min_perms);
         link->srcpic = picref;
         link->cur_pic->pts = link->srcpic->pts;
+        link->cur_pic->pixel_aspect = link->srcpic->pixel_aspect;
     }
     else
         link->cur_pic = picref;