From fefe43ff2c180928348d445abb9696cf2581d953 Mon Sep 17 00:00:00 2001
From: Alex Converse <alex.converse@gmail.com>
Date: Tue, 3 Mar 2009 18:19:44 +0000
Subject: [PATCH] MOV: fix crash when 'meta' occurs before first 'trak'

Originally committed as revision 17781 to svn://svn.ffmpeg.org/ffmpeg/trunk
---
 libavformat/mov.c | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/libavformat/mov.c b/libavformat/mov.c
index b34326c3cf..88f8003057 100644
--- a/libavformat/mov.c
+++ b/libavformat/mov.c
@@ -308,10 +308,15 @@ static int mov_read_dref(MOVContext *c, ByteIOContext *pb, MOVAtom atom)
 
 static int mov_read_hdlr(MOVContext *c, ByteIOContext *pb, MOVAtom atom)
 {
-    AVStream *st = c->fc->streams[c->fc->nb_streams-1];
+    AVStream *st;
     uint32_t type;
     uint32_t ctype;
 
+    if (c->fc->nb_streams < 1) // meta before first trak
+        return 0;
+
+    st = c->fc->streams[c->fc->nb_streams-1];
+
     get_byte(pb); /* version */
     get_be24(pb); /* flags */