diff --git a/libavformat/utils.c b/libavformat/utils.c
index 41450971af..9c59947fb7 100644
--- a/libavformat/utils.c
+++ b/libavformat/utils.c
@@ -2782,7 +2782,11 @@ int avformat_write_header(AVFormatContext *s, AVDictionary **options)
                 goto fail;
             }
             if(av_cmp_q(st->sample_aspect_ratio, st->codec->sample_aspect_ratio)){
-                av_log(s, AV_LOG_ERROR, "Aspect ratio mismatch between encoder and muxer layer\n");
+                av_log(s, AV_LOG_ERROR, "Aspect ratio mismatch between encoder "
+                       "(%d/%d) and muxer layer (%d/%d)\n",
+                       st->sample_aspect_ratio.num, st->sample_aspect_ratio.den,
+                       st->codec->sample_aspect_ratio.num,
+                       st->codec->sample_aspect_ratio.den);
                 ret = AVERROR(EINVAL);
                 goto fail;
             }