From 0354ddb71c18ea8e9d05d6d2509f9ec786a4488d Mon Sep 17 00:00:00 2001
From: Michael Niedermayer <michaelni@gmx.at>
Date: Fri, 19 Sep 2008 12:37:38 +0000
Subject: [PATCH] Ensure that muxer and encoder aspect ratios match. So no
 invalid files are generated.

Originally committed as revision 15367 to svn://svn.ffmpeg.org/ffmpeg/trunk
---
 libavformat/utils.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/libavformat/utils.c b/libavformat/utils.c
index c124507446..8938c499f5 100644
--- a/libavformat/utils.c
+++ b/libavformat/utils.c
@@ -2457,6 +2457,10 @@ int av_write_header(AVFormatContext *s)
                 av_log(s, AV_LOG_ERROR, "dimensions not set\n");
                 return -1;
             }
+            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");
+                return -1;
+            }
             break;
         }